Add the need_membership field to article

This field is a boolean indicating if the article can be purshased by
nonmembers.

cotisations/migrations/0046_article_need_membership.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.29 on 2020-09-25 16:45
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cotisations', '0045_separation_membership_connection_p3'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='article',
+            name='need_membership',
+            field=models.BooleanField(default=True, verbose_name='can be purcharsed without membership'),
+        ),
+    ]

cotisations/migrations/0047_article_need_membership_init.py

@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.29 on 2020-09-25 16:45
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cotisations', '0046_article_need_membership'),
+    ]
+
+    def init_need_membership(apps, schema_editor):
+        db_alias = schema_editor.connection.alias
+        article = apps.get_model("cotisations", "Article")
+        articles = article.objects.using(db_alias).all()
+        for art in articles:
+            v = False
+            v = v or bool(art.duration_membership)
+            v = v or bool(art.duration_days_membership)
+            v = v or not (bool(art.duration_connection) or bool(art.duration_days_connection))
+            art.need_membership = v
+            art.save()
+
+    operations = [
+        migrations.RunPython(init_need_membership, lambda *args, **kargs: None),
+    ]

cotisations/models.py

@@ -678,6 +678,7 @@ class Article(RevMixin, AclMixin, models.Model):
         * a price
         * a duration for the membership
         * a duration for the connection
+        * if the article can be purchased without membership
         * a type of user (indicating what kind of user can buy this article)
     """
 
@@ -718,6 +719,11 @@ class Article(RevMixin, AclMixin, models.Model):
         verbose_name=_("duration of the connection (in days, will be added to duration in months)"),
     )
 
+    need_membership = models.BooleanField(
+        default=True,
+        verbose_name=_("need membership to be purchased"),
+    )
+
     type_user = models.CharField(
         choices=USER_TYPES,
         default="All",
@@ -787,9 +793,7 @@ class Article(RevMixin, AclMixin, models.Model):
             objects_pool = objects_pool.filter(
                 Q(duration_membership__gt=0)
                 |Q(duration_days_membership__gt=0)
-                |~(Q(duration_connection__gt=0) # BAD nonstandard hardcoded comportmant
-                   |Q(duration_days_connection__gt=0)
-                 )
+                |Q(need_membership=False)
             )
         if user.has_perm("cotisations.buy_every_article"):
             return objects_pool