From ca824164f4e57bef8da158a412a4e4bf8a5db526 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jakub=20Kuba=20R=C5=AF=C5=BEi=C4=8Dka?=
 <ruzickajakub.nbk@gmail.com>
Date: Thu, 23 May 2019 23:44:44 +0200
Subject: [PATCH 1/8] =?UTF-8?q?testutils.py:=20odsazen=C3=AD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 seminar/testutils.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/seminar/testutils.py b/seminar/testutils.py
index 820a95f4..a8cd7052 100644
--- a/seminar/testutils.py
+++ b/seminar/testutils.py
@@ -165,10 +165,10 @@ def gen_ulohy_do_cisla(rnd, cislo, organizatori, resitele, slovnik_cisel, size):
 			res_vyber = rnd.sample(resitele, min(poc_reseni, len(resitele) - 2))
 			for resitel in res_vyber:
 				res = Reseni.objects.create(problem = p, 
-				resitele=[resitel], 
-				forma=rnd.choice(Reseni.FORMA_CHOICES))
+				    resitele=[resitel], 
+				    forma=rnd.choice(Reseni.FORMA_CHOICES))
 				hod = Hodnoceni.objects.create(body=rnd.randint(0, p.max_body),
-				cislo_body=slovnik_cisel[cislo], reseni=res, problem=p)
+				    cislo_body=slovnik_cisel[cislo], reseni=res, problem=p)
 	return 
 
 def gen_soustredeni():

From 0faf1d381ebc843b2f1c50bcd1b95a147a7f6b7e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1=C5=A1=20Domes?= <domestomas@gmail.com>
Date: Thu, 23 May 2019 23:54:30 +0200
Subject: [PATCH 2/8] =?UTF-8?q?testutil.py:=20odsazen=C3=AD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 seminar/testutils.py | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/seminar/testutils.py b/seminar/testutils.py
index a8cd7052..3bb21e30 100644
--- a/seminar/testutils.py
+++ b/seminar/testutils.py
@@ -116,7 +116,10 @@ def gen_organizatori(rnd, osoby, last_rocnik, users):
 	return organizatori
 
 def gen_ulohy_do_cisla(rnd, cislo, organizatori, resitele, slovnik_cisel, size):
-	'''cislo = cislo cisla v rocniku, nikoli objekt Cislo '''
+	'''
+	cislo = cislo cisla v rocniku, nikoli objekt Cislo
+	'''
+	
 	# ulohy resene v ci
 	jaka = ["Šachová", "Černá", "Větrná", "Dlouhá", "Křehká", "Rychlá", 
 		"Zákeřná", "Fyzikální"]
@@ -152,8 +155,13 @@ def gen_ulohy_do_cisla(rnd, cislo, organizatori, resitele, slovnik_cisel, size):
 				cislo_reseni=slovnik_cisel[cislo], 
 				cislo_deadline=slovnik_cisel[cislo], 
 				max_body = rnd.randint(1, 8))
-			p.zadani = " ".join([rnd.choice(sloveso), rnd.choice(koho), 
-				rnd.choice(ceho), rnd.choice(jmeno), rnd.choice(kde)])
+			p.zadani = " ".join(
+				[rnd.choice(sloveso), 
+				rnd.choice(koho), 
+				rnd.choice(ceho), 
+				rnd.choice(jmeno), 
+				rnd.choice(kde)]
+			)
 			p.vzorak = " - ".join([p.zadani, rnd.choice(reseni)]) 
 			p.save()
 
@@ -164,11 +172,17 @@ def gen_ulohy_do_cisla(rnd, cislo, organizatori, resitele, slovnik_cisel, size):
 			# (nebo skoro vsechny resitele, pokud jich je mene nez pocet reseni)
 			res_vyber = rnd.sample(resitele, min(poc_reseni, len(resitele) - 2))
 			for resitel in res_vyber:
-				res = Reseni.objects.create(problem = p, 
-				    resitele=[resitel], 
-				    forma=rnd.choice(Reseni.FORMA_CHOICES))
-				hod = Hodnoceni.objects.create(body=rnd.randint(0, p.max_body),
-				    cislo_body=slovnik_cisel[cislo], reseni=res, problem=p)
+				res = Reseni.objects.create(
+					problem = p, 
+					resitele=[resitel], 
+					forma=rnd.choice(Reseni.FORMA_CHOICES)
+				)
+				hod = Hodnoceni.objects.create(
+					body=rnd.randint(0, p.max_body),
+					cislo_body=slovnik_cisel[cislo],
+					reseni=res,
+					problem=p
+				)
 	return 
 
 def gen_soustredeni():

From 42fcc91a68a7fd4600fe884ea8970587554742aa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1=C5=A1=20Domes?= <domestomas@gmail.com>
Date: Fri, 24 May 2019 00:02:22 +0200
Subject: [PATCH 3/8] =?UTF-8?q?testutil.py:=20odsazen=C3=AD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 seminar/testutils.py | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/seminar/testutils.py b/seminar/testutils.py
index 3bb21e30..3f1fbf1c 100644
--- a/seminar/testutils.py
+++ b/seminar/testutils.py
@@ -154,7 +154,8 @@ def gen_ulohy_do_cisla(rnd, cislo, organizatori, resitele, slovnik_cisel, size):
 				cislo_zadani=slovnik_cisel[cislo-2], 
 				cislo_reseni=slovnik_cisel[cislo], 
 				cislo_deadline=slovnik_cisel[cislo], 
-				max_body = rnd.randint(1, 8))
+				max_body = rnd.randint(1, 8)
+			)
 			p.zadani = " ".join(
 				[rnd.choice(sloveso), 
 				rnd.choice(koho), 
@@ -187,9 +188,13 @@ def gen_ulohy_do_cisla(rnd, cislo, organizatori, resitele, slovnik_cisel, size):
 
 def gen_soustredeni():
 	# TODO: vice soustredeni a k nim nahodne podmnoziny organizatoru a ucastniku
-	sous = Soustredeni.objects.create(rocnik=Rocnik.objects.first(), verejne_db=True, 
-		misto=u'Někde',	datum_zacatku=datetime.date(2000, 11, 23), 
-		datum_konce=datetime.date(2000, 11, 27))
+	sous = Soustredeni.objects.create(
+		rocnik=Rocnik.objects.first(),
+		verejne_db=True, 
+		misto=u'Někde',
+		datum_zacatku=datetime.date(2000, 11, 23), 
+		datum_konce=datetime.date(2000, 11, 27)
+	)
 
 	for res in rnd.sample(resitele, 6):
 		Soustredeni_Ucastnici.objects.create(resitel=res, soustredeni=sous)

From 2f50906e6fb4cb9a349b0febdbaf151d1e5d2c23 Mon Sep 17 00:00:00 2001
From: "Tomas \"Jethro\" Pokorny" <xtompok@gmail.com>
Date: Fri, 24 May 2019 00:13:35 +0200
Subject: [PATCH 4/8] Update modelu - Nody

---
 Schema_new.dia                                | Bin 14335 -> 14633 bytes
 seminar/migrations/0050_auto_20190510_2228.py |  48 +++++++++++++++---
 seminar/models.py                             |  34 +++++++++++--
 3 files changed, 71 insertions(+), 11 deletions(-)

diff --git a/Schema_new.dia b/Schema_new.dia
index d7a38dbdaa369012ffa94b3dddbf5ebc54f737be..536c3c4841c63cb49711199adb87006b65017033 100644
GIT binary patch
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zA!|9T;n-s!pMcW9wr4E6nv$1$*GXsj`ol0y5T~ff`w+X1`n&ikCS(r>G9ExvG-Kr6
znoe_u1W67Zn8IYuv-<?#CNEz%;-QfUeMQ0BrEmJ&DAmChSg_$=w8SRa$zAJrxhPJ+
zj~j|t^(k043~%LZramM|AB4|ibkTp`^L2|dp3cr`kkLemxz#=#2jG=%?=A7sq}E*c
zvj~n`*0%T~ukG&v^h{=$`5c}=ky@czw;htGOoZNWToU>nCt@bIZQ0}$>L~;jYX^z6
z(41~)OBy6*qo9i%5lpI|lVuAt-n#ly`Lz1|$UnS|u^xM0BP_oW<!p6|1o<+UUk^Z4
zZ3PX4C%R;}jym;WV)M3M%6pJ!W!L^h49X3|XNpG7x#<Gr_us@|$BMv?QtXS-wGW8%
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zBKwxJ)X&BF7@t%V?TIE<_LGI#8UY|yNg2A4dMPk|2o=+Tw^{dIX$rkpnuNjH=lt)(
zrWuQhzWOS|&+dO2n&WC&Yd9;A2_OE3atM<{I#7u#CSvtIbWPN`^%g+WHZ?a}W(t*1
zn}(S9Yj?82>x8S+1<_FW6F?sdz^K=aT!JcrmH0LKXP{-3o*c!;8bd~n5U8QQqa9Wq
zz+qs5?JZFyynVcrPc_8igN1cJHCQwca_^;4H5~F#@wU?$Ua5DDUxGiO@>_i00SjBx
z+I7d83Of;<MV&c+$LW@09h9i}C!!&j;GDkkydBPrw<nE0)HmP#Y2%k;{a0VhEW~KJ
I+Yb=`53G$aV*mgE

diff --git a/seminar/migrations/0050_auto_20190510_2228.py b/seminar/migrations/0050_auto_20190510_2228.py
index 4226380a..fe82dbfc 100644
--- a/seminar/migrations/0050_auto_20190510_2228.py
+++ b/seminar/migrations/0050_auto_20190510_2228.py
@@ -112,19 +112,53 @@ class Migration(migrations.Migration):
             },
         ),
         migrations.CreateModel(
-            name='UlohaNode',
+            name='UlohaVzorakNode',
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('first_child', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.UlohaNode', verbose_name='první potomek')),
-                ('root', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.UlohaNode', verbose_name='kořen stromu')),
-                ('succ', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.UlohaNode', verbose_name='další element na stejné úrovni')),
+                ('first_child', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.UlohaVzorakNode', verbose_name='první potomek')),
+                ('root', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.UlohaVzorakNode', verbose_name='kořen stromu')),
+                ('succ', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.UlohaVzorakNode', verbose_name='další element na stejné úrovni')),
             ],
             options={
-                'verbose_name': 'Úloha (Node)',
-                'verbose_name_plural': 'Úlohy (Node)',
-                'db_table': 'seminar_nodes_uloha',
+                'verbose_name': 'Vzorák úlohy (Node)',
+                'verbose_name_plural': 'Vzoráky úloh (Node)',
+                'db_table': 'seminar_nodes_uloha_vzorak',
             },
         ),
+        migrations.CreateModel(
+            name='UlohaZadaniNode',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('first_child', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.UlohaZadaniNode', verbose_name='první potomek')),
+                ('root', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.UlohaZadaniNode', verbose_name='kořen stromu')),
+                ('succ', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.UlohaZadaniNode', verbose_name='další element na stejné úrovni')),
+            ],
+            options={
+                'verbose_name': 'Zadání úlohy (Node)',
+                'verbose_name_plural': 'Zadání úloh (Node)',
+                'db_table': 'seminar_nodes_uloha_zadani',
+            },
+	),
+        migrations.AddField(
+            model_name='claneknode',
+            name='clanek',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Clanek', verbose_name='článek'),
+        ),
+        migrations.AddField(
+            model_name='konferanode',
+            name='konfera',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Konfera', verbose_name='konfera'),
+        ),
+        migrations.AddField(
+            model_name='ulohavzoraknode',
+            name='uloha',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Uloha', verbose_name='úloha'),
+        ),
+        migrations.AddField(
+            model_name='ulohazadaninode',
+            name='uloha',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Uloha', verbose_name='úloha'),
+        ),
         migrations.AlterField(
             model_name='konfera',
             name='reseni',
diff --git a/seminar/models.py b/seminar/models.py
index f5dd6703..e4d3d34f 100644
--- a/seminar/models.py
+++ b/seminar/models.py
@@ -1144,18 +1144,44 @@ class KonferaNode(TreeNode):
 		db_table = 'seminar_nodes_konfera'
 		verbose_name = 'Konfera (Node)'
 		verbose_name_plural = 'Konfery (Node)'
+	konfera = models.ForeignKey(Konfera,
+		on_delete=models.PROTECT, # Pokud chci mazat téma, musím si Node pořešit ručně
+		verbose_name = "konfera",
+		null=True,
+		blank=False)
 
 class ClanekNode(TreeNode):
 	class Meta:
 		db_table = 'seminar_nodes_clanek'
 		verbose_name = 'Článek (Node)'
 		verbose_name_plural = 'Články (Node)'
+	clanek = models.ForeignKey(Clanek,
+		on_delete=models.PROTECT, # Pokud chci mazat téma, musím si Node pořešit ručně
+		verbose_name = "článek",
+		null=True,
+		blank=False)
+
+class UlohaZadaniNode(TreeNode):
+	class Meta:
+		db_table = 'seminar_nodes_uloha_zadani'
+		verbose_name = 'Zadání úlohy (Node)'
+		verbose_name_plural = 'Zadání úloh (Node)'
+	uloha = models.ForeignKey(Uloha,
+		on_delete=models.PROTECT, # Pokud chci mazat téma, musím si Node pořešit ručně
+		verbose_name = "úloha",
+		null=True,
+		blank=False)
 
-class UlohaNode(TreeNode):
+class UlohaVzorakNode(TreeNode):
 	class Meta:
-		db_table = 'seminar_nodes_uloha'
-		verbose_name = 'Úloha (Node)'
-		verbose_name_plural = 'Úlohy (Node)'
+		db_table = 'seminar_nodes_uloha_vzorak'
+		verbose_name = 'Vzorák úlohy (Node)'
+		verbose_name_plural = 'Vzoráky úloh (Node)'
+	uloha = models.ForeignKey(Uloha,
+		on_delete=models.PROTECT, # Pokud chci mazat téma, musím si Node pořešit ručně
+		verbose_name = "úloha",
+		null=True,
+		blank=False)
 
 class TextNode(TreeNode):
 	class Meta:

From de7aae8646ea4bf2facd818156aa63bfdbb7cb16 Mon Sep 17 00:00:00 2001
From: LEdoian <tap9701@gmail.com>
Date: Fri, 24 May 2019 00:17:12 +0200
Subject: [PATCH 5/8] =?UTF-8?q?Migrace:=20generov=C3=A1n=C3=AD=20v=C5=A1ec?=
 =?UTF-8?q?h=20Ro=C4=8Dn=C3=ADkNod=C5=AF=20a=20=C4=8C=C3=ADsloNod=C5=AF?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../0056_vrcholy_pro_rocniky_a_cisla.py       | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py

diff --git a/seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py b/seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py
new file mode 100644
index 00000000..6e638980
--- /dev/null
+++ b/seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py
@@ -0,0 +1,44 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.20 on 2019-05-23 21:54
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+def generuj_RocnikNody_a_CisloNody(apps,schema_editor):
+	Rocnik = apps.get_model('seminar', 'Rocnik')
+	RocnikNode = apps.get_model('seminar', 'RocnikNode')
+	Cislo = apps.get_model('seminar', 'Rocnik')
+	CisloNode = apps.get_model('seminar', 'RocnikNode')
+
+	last_rn = None		# last_* slouží k navázání následníků
+	for r in Rocnik.objects.all():
+		rn = RocnikNode.objects.create(rocnik=r)
+		rn.save()
+		rn.root = rn
+		rn.save()
+		if last_rn:
+			last_rn.succ = rn
+			last_rn.save()
+		last_rn = rn
+		
+		last_cn = None
+		for c in Cislo.objects.filter(rocnik=r):
+			cn = CisloNode.objects.create(cislo=c, root=rn)
+			cn.save()
+			if last_cn:
+				last_cn.succ = cn
+				last_cn.save()
+			last_cn = cn
+
+
+
+
+class Migration(migrations.Migration):
+
+	dependencies = [
+		('seminar', '0055_smazat_nemigrovane_zastarale_veci'),
+	]
+
+	operations = [
+		migrations.RunPython(generuj_RocnikNody_a_CisloNody),
+	]

From 37c81de60161608e865dad0371adf92ba6372174 Mon Sep 17 00:00:00 2001
From: LEdoian <tap9701@gmail.com>
Date: Fri, 24 May 2019 00:19:53 +0200
Subject: [PATCH 6/8] =?UTF-8?q?Migrace:=20je=C5=A1t=C4=9B=20zapomenut?=
 =?UTF-8?q?=C3=BD=20first=5Fchild=20u=20p=C5=99edchoz=C3=ADho=20commitu?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py b/seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py
index 6e638980..e583e58d 100644
--- a/seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py
+++ b/seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py
@@ -25,9 +25,12 @@ def generuj_RocnikNody_a_CisloNody(apps,schema_editor):
 		for c in Cislo.objects.filter(rocnik=r):
 			cn = CisloNode.objects.create(cislo=c, root=rn)
 			cn.save()
-			if last_cn:
+			if last_cn:	# Jsme něčí následník
 				last_cn.succ = cn
 				last_cn.save()
+			else:	# Jsme první v řadě, takže se musíme přidat jako first_child RočníkNodu
+				rn.first_child = cn
+				rn.save()
 			last_cn = cn
 
 

From ddbc169f494faf3fcaaed5b1a14803f014d5de2e Mon Sep 17 00:00:00 2001
From: LEdoian <tap9701@gmail.com>
Date: Fri, 24 May 2019 00:27:29 +0200
Subject: [PATCH 7/8] =?UTF-8?q?Migrace:=20Neum=C3=ADm=20sed-ovat,=20tak=20?=
 =?UTF-8?q?dal=C5=A1=C3=AD=20pokus=20o=20migraci=20=C4=8C=C3=ADsloNod?=
 =?UTF-8?q?=C5=AF?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py b/seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py
index e583e58d..024400a4 100644
--- a/seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py
+++ b/seminar/migrations/0056_vrcholy_pro_rocniky_a_cisla.py
@@ -7,8 +7,8 @@ from django.db import migrations
 def generuj_RocnikNody_a_CisloNody(apps,schema_editor):
 	Rocnik = apps.get_model('seminar', 'Rocnik')
 	RocnikNode = apps.get_model('seminar', 'RocnikNode')
-	Cislo = apps.get_model('seminar', 'Rocnik')
-	CisloNode = apps.get_model('seminar', 'RocnikNode')
+	Cislo = apps.get_model('seminar', 'Cislo')
+	CisloNode = apps.get_model('seminar', 'CisloNode')
 
 	last_rn = None		# last_* slouží k navázání následníků
 	for r in Rocnik.objects.all():

From 69f9b54e7b5dbb36070d978d29d90987b1c9212b Mon Sep 17 00:00:00 2001
From: "Tomas \"Jethro\" Pokorny" <xtompok@gmail.com>
Date: Fri, 24 May 2019 00:44:45 +0200
Subject: [PATCH 8/8] TreeNode odabstrahovano.

---
 seminar/migrations/0050_auto_20190510_2228.py | 164 ++++++++----------
 seminar/models.py                             |  11 +-
 2 files changed, 77 insertions(+), 98 deletions(-)

diff --git a/seminar/migrations/0050_auto_20190510_2228.py b/seminar/migrations/0050_auto_20190510_2228.py
index fe82dbfc..7e54a817 100644
--- a/seminar/migrations/0050_auto_20190510_2228.py
+++ b/seminar/migrations/0050_auto_20190510_2228.py
@@ -13,81 +13,115 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        migrations.AlterField(
+            model_name='konfera',
+            name='reseni',
+            field=models.OneToOneField(blank=True, help_text='Účastnický přípěvek o konfeře', null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='konfery', to='seminar.Reseni', verbose_name='článek ke konfeře'),
+        ),
+        migrations.AlterField(
+            model_name='organizator',
+            name='osoba',
+            field=models.OneToOneField(help_text='osobní údaje organizátora', null=True, on_delete=django.db.models.deletion.CASCADE, related_name='org', to='seminar.Osoba', verbose_name='osoba'),
+        ),
+        migrations.AlterField(
+            model_name='reseni',
+            name='text_cely',
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='reseni_cely_set', to='seminar.Text', verbose_name='Plná verze textu řešení'),
+        ),
+        migrations.AlterField(
+            model_name='resitel',
+            name='osoba',
+            field=models.OneToOneField(null=True, on_delete=django.db.models.deletion.CASCADE, to='seminar.Osoba', verbose_name='osoba'),
+        ),
+        migrations.AlterField(
+            model_name='uloha',
+            name='vzorak',
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='uloha_vzorak_set', to='seminar.Text', verbose_name='vzorové řešení'),
+        ),
+        migrations.AlterField(
+            model_name='uloha',
+            name='zadani',
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='uloha_zadani_set', to='seminar.Text', verbose_name='veřejné zadání'),
+        ),
         migrations.CreateModel(
-            name='CisloNode',
+            name='TreeNode',
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
             ],
+            options={
+                'verbose_name': 'TreeNode',
+                'verbose_name_plural': 'TreeNody',
+                'db_table': 'seminar_nodes_treenode',
+            },
+        ),
+        migrations.CreateModel(
+            name='CisloNode',
+            fields=[
+                ('treenode_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='seminar.TreeNode')),
+                ('cislo', models.OneToOneField(on_delete=django.db.models.deletion.PROTECT, to='seminar.Cislo', verbose_name='číslo')),
+            ],
             options={
                 'verbose_name': 'Číslo (Node)',
                 'verbose_name_plural': 'Čísla (Node)',
                 'db_table': 'seminar_nodes_cislo',
             },
+            bases=('seminar.treenode',),
         ),
         migrations.CreateModel(
             name='ClanekNode',
             fields=[
-                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('first_child', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.ClanekNode', verbose_name='první potomek')),
-                ('root', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.ClanekNode', verbose_name='kořen stromu')),
-                ('succ', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.ClanekNode', verbose_name='další element na stejné úrovni')),
+                ('treenode_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='seminar.TreeNode')),
+                ('clanek', models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Clanek', verbose_name='článek')),
             ],
             options={
                 'verbose_name': 'Článek (Node)',
                 'verbose_name_plural': 'Články (Node)',
                 'db_table': 'seminar_nodes_clanek',
             },
+            bases=('seminar.treenode',),
         ),
         migrations.CreateModel(
             name='KonferaNode',
             fields=[
-                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('first_child', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.KonferaNode', verbose_name='první potomek')),
-                ('root', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.KonferaNode', verbose_name='kořen stromu')),
-                ('succ', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.KonferaNode', verbose_name='další element na stejné úrovni')),
+                ('treenode_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='seminar.TreeNode')),
+                ('konfera', models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Konfera', verbose_name='konfera')),
             ],
             options={
                 'verbose_name': 'Konfera (Node)',
                 'verbose_name_plural': 'Konfery (Node)',
                 'db_table': 'seminar_nodes_konfera',
             },
+            bases=('seminar.treenode',),
         ),
         migrations.CreateModel(
             name='MezicisloNode',
             fields=[
-                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('first_child', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.MezicisloNode', verbose_name='první potomek')),
-                ('root', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.MezicisloNode', verbose_name='kořen stromu')),
-                ('succ', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.MezicisloNode', verbose_name='další element na stejné úrovni')),
+                ('treenode_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='seminar.TreeNode')),
             ],
             options={
                 'verbose_name': 'Mezičíslo (Node)',
                 'verbose_name_plural': 'Mezičísla (Node)',
                 'db_table': 'seminar_nodes_mezicislo',
             },
+            bases=('seminar.treenode',),
         ),
         migrations.CreateModel(
             name='RocnikNode',
             fields=[
-                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('first_child', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.RocnikNode', verbose_name='první potomek')),
+                ('treenode_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='seminar.TreeNode')),
                 ('rocnik', models.OneToOneField(on_delete=django.db.models.deletion.PROTECT, to='seminar.Rocnik', verbose_name='ročník')),
-                ('root', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.RocnikNode', verbose_name='kořen stromu')),
-                ('succ', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.RocnikNode', verbose_name='další element na stejné úrovni')),
             ],
             options={
                 'verbose_name': 'Ročník (Node)',
                 'verbose_name_plural': 'Ročníky (Node)',
                 'db_table': 'seminar_nodes_rocnik',
             },
+            bases=('seminar.treenode',),
         ),
         migrations.CreateModel(
             name='TemaVCisleNode',
             fields=[
-                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('first_child', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.TemaVCisleNode', verbose_name='první potomek')),
-                ('root', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.TemaVCisleNode', verbose_name='kořen stromu')),
-                ('succ', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.TemaVCisleNode', verbose_name='další element na stejné úrovni')),
+                ('treenode_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='seminar.TreeNode')),
                 ('tema', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, to='seminar.Tema', verbose_name='téma v čísle')),
             ],
             options={
@@ -95,14 +129,12 @@ class Migration(migrations.Migration):
                 'verbose_name_plural': 'Témata v čísle (Node)',
                 'db_table': 'seminar_nodes_temavcisle',
             },
+            bases=('seminar.treenode',),
         ),
         migrations.CreateModel(
             name='TextNode',
             fields=[
-                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('first_child', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.TextNode', verbose_name='první potomek')),
-                ('root', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.TextNode', verbose_name='kořen stromu')),
-                ('succ', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.TextNode', verbose_name='další element na stejné úrovni')),
+                ('treenode_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='seminar.TreeNode')),
                 ('text', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, to='seminar.Text', verbose_name='text')),
             ],
             options={
@@ -110,103 +142,47 @@ class Migration(migrations.Migration):
                 'verbose_name_plural': 'Text (Node)',
                 'db_table': 'seminar_nodes_obsah',
             },
+            bases=('seminar.treenode',),
         ),
         migrations.CreateModel(
             name='UlohaVzorakNode',
             fields=[
-                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('first_child', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.UlohaVzorakNode', verbose_name='první potomek')),
-                ('root', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.UlohaVzorakNode', verbose_name='kořen stromu')),
-                ('succ', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.UlohaVzorakNode', verbose_name='další element na stejné úrovni')),
+                ('treenode_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='seminar.TreeNode')),
+                ('uloha', models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Uloha', verbose_name='úloha')),
             ],
             options={
                 'verbose_name': 'Vzorák úlohy (Node)',
                 'verbose_name_plural': 'Vzoráky úloh (Node)',
                 'db_table': 'seminar_nodes_uloha_vzorak',
             },
+            bases=('seminar.treenode',),
         ),
         migrations.CreateModel(
             name='UlohaZadaniNode',
             fields=[
-                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('first_child', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.UlohaZadaniNode', verbose_name='první potomek')),
-                ('root', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.UlohaZadaniNode', verbose_name='kořen stromu')),
-                ('succ', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.UlohaZadaniNode', verbose_name='další element na stejné úrovni')),
+                ('treenode_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='seminar.TreeNode')),
+                ('uloha', models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Uloha', verbose_name='úloha')),
             ],
             options={
                 'verbose_name': 'Zadání úlohy (Node)',
                 'verbose_name_plural': 'Zadání úloh (Node)',
                 'db_table': 'seminar_nodes_uloha_zadani',
             },
-	),
-        migrations.AddField(
-            model_name='claneknode',
-            name='clanek',
-            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Clanek', verbose_name='článek'),
-        ),
-        migrations.AddField(
-            model_name='konferanode',
-            name='konfera',
-            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Konfera', verbose_name='konfera'),
-        ),
-        migrations.AddField(
-            model_name='ulohavzoraknode',
-            name='uloha',
-            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Uloha', verbose_name='úloha'),
-        ),
-        migrations.AddField(
-            model_name='ulohazadaninode',
-            name='uloha',
-            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Uloha', verbose_name='úloha'),
-        ),
-        migrations.AlterField(
-            model_name='konfera',
-            name='reseni',
-            field=models.OneToOneField(blank=True, help_text='Účastnický přípěvek o konfeře', null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='konfery', to='seminar.Reseni', verbose_name='článek ke konfeře'),
-        ),
-        migrations.AlterField(
-            model_name='organizator',
-            name='osoba',
-            field=models.OneToOneField(help_text='osobní údaje organizátora', null=True, on_delete=django.db.models.deletion.CASCADE, related_name='org', to='seminar.Osoba', verbose_name='osoba'),
-        ),
-        migrations.AlterField(
-            model_name='reseni',
-            name='text_cely',
-            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='reseni_cely_set', to='seminar.Text', verbose_name='Plná verze textu řešení'),
-        ),
-        migrations.AlterField(
-            model_name='resitel',
-            name='osoba',
-            field=models.OneToOneField(null=True, on_delete=django.db.models.deletion.CASCADE, to='seminar.Osoba', verbose_name='osoba'),
-        ),
-        migrations.AlterField(
-            model_name='uloha',
-            name='vzorak',
-            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='uloha_vzorak_set', to='seminar.Text', verbose_name='vzorové řešení'),
-        ),
-        migrations.AlterField(
-            model_name='uloha',
-            name='zadani',
-            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='uloha_zadani_set', to='seminar.Text', verbose_name='veřejné zadání'),
-        ),
-        migrations.AddField(
-            model_name='cislonode',
-            name='cislo',
-            field=models.OneToOneField(on_delete=django.db.models.deletion.PROTECT, to='seminar.Cislo', verbose_name='číslo'),
+            bases=('seminar.treenode',),
         ),
         migrations.AddField(
-            model_name='cislonode',
+            model_name='treenode',
             name='first_child',
-            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.CisloNode', verbose_name='první potomek'),
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='seminar.TreeNode', verbose_name='první potomek'),
         ),
         migrations.AddField(
-            model_name='cislonode',
+            model_name='treenode',
             name='root',
-            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.CisloNode', verbose_name='kořen stromu'),
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='potomci_set', to='seminar.TreeNode', verbose_name='kořen stromu'),
         ),
         migrations.AddField(
-            model_name='cislonode',
+            model_name='treenode',
             name='succ',
-            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.CisloNode', verbose_name='další element na stejné úrovni'),
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='prev', to='seminar.TreeNode', verbose_name='další element na stejné úrovni'),
         ),
     ]
diff --git a/seminar/models.py b/seminar/models.py
index e4d3d34f..8e61e09c 100644
--- a/seminar/models.py
+++ b/seminar/models.py
@@ -1086,19 +1086,22 @@ class Obrazek(SeminarModelBase):
 
 class TreeNode(models.Model):
 	class Meta:
-		abstract = True
-	root = models.ForeignKey('self',
+		db_table = "seminar_nodes_treenode"
+		verbose_name = "TreeNode"
+		verbose_name_plural = "TreeNody"
+
+	root = models.ForeignKey('TreeNode',
 		related_name="potomci_set",
 		null = True,
 		blank = False,
 		on_delete = models.SET_NULL, # Vrcholy s null kořenem jsou sirotci bez ročníku 
 		verbose_name="kořen stromu")
-	first_child = models.ForeignKey('self',
+	first_child = models.ForeignKey('TreeNode',
 		null = True,
 		blank = True,
 		on_delete=models.SET_NULL,
 		verbose_name="první potomek")
-	succ = models.OneToOneField('self',
+	succ = models.OneToOneField('TreeNode',
 		related_name="prev",
 		null = True,
 		blank = True,