projects: add topics as m2m relation

adhocracy4/projects/migrations/0042_topic_alter_project_topics_project_m2mtopics.py

@@ -0,0 +1,34 @@
+# Generated by Django 4.2 on 2023-11-29 13:18
+
+import adhocracy4.projects.fields
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("a4projects", "0041_ckeditor5_iframes"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="Topic",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("code", models.CharField(blank=True, max_length=10)),
+                ("name", models.CharField(max_length=120, verbose_name="Topic")),
+            ],
+        ),
+        migrations.AddField(
+            model_name="project",
+            name="m2mtopics",
+            field=models.ManyToManyField(to="a4projects.topic"),
+        ),
+    ]

adhocracy4/projects/migrations/0043_migrate_topics_to_m2m_topics.py

@@ -0,0 +1,30 @@
+# Generated by Django 4.2 on 2023-11-29 13:20
+
+from django.db import migrations, models
+from django.conf import settings
+
+
+def add_topics_to_m2m_table(apps, schema_editor):
+    if settings.A4_PROJECT_TOPICS:
+        topicenum = settings.A4_PROJECT_TOPICS
+        project = apps.get_model("a4projects", "Project")
+        for project in project.objects.all():
+            for topic_code in project.topics:
+                project.m2mtopics.create(
+                    code=topic_code,
+                    name=[item[1] for item in topicsenum if item[0] == topic_code][0],
+                )
+    else:
+        pass
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("a4projects", "0042_topic_alter_project_topics_project_m2mtopics"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            add_topics_to_m2m_table,
+        ),
+    ]

adhocracy4/projects/migrations/0044_remove_project_field_topics.py

@@ -0,0 +1,16 @@
+# Generated by Django 4.2 on 2023-11-29 15:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("a4projects", "0043_migrate_topics_to_m2m_topics"),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name="project",
+            name="topics",
+        ),
+    ]

adhocracy4/projects/migrations/0045_rename_field_m2mtopics_to_topics.py

@@ -0,0 +1,15 @@
+# Generated by Django 4.2 on 2023-11-29 15:14
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("a4projects", "0044_remove_project_field_topics"),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name="project", old_name="m2mtopics", new_name="topics"
+        ),
+    ]

adhocracy4/projects/models.py

@@ -19,11 +19,21 @@
 from adhocracy4.models import base
 
 from .enums import Access
-from .fields import TopicField
 from .utils import get_module_clusters
 from .utils import get_module_clusters_dict
 
 
+class Topic(models.Model):
+    code = models.CharField(blank=True, max_length=10)
+    name = models.CharField(
+        max_length=120,
+        verbose_name=_("Topic"),
+    )
+
+    def __str__(self):
+        return self.name
+
+
 class ProjectManager(models.Manager):
     def get_by_natural_key(self, name):
         return self.get(name=name)
@@ -259,9 +269,8 @@ class Project(
             "dashboard."
         ),
     )
-    topics = TopicField(
-        verbose_name=_("Project topics"), help_text=_("Add topics to your project.")
-    )
+    topics = models.ManyToManyField(Topic)
+
     project_type = models.CharField(
         blank=True, max_length=256, default="a4projects.Project"
     )