Writing a custom tag splitter|joiner makes our life easier. And tags merging is now working.

apps/rp/api/serializers.py

@@ -33,7 +33,8 @@ class ArticleSerializer(TaggitSerializer, serializers.ModelSerializer):
     #: List of short tags to describe the article (eg. "Privacy", "Copyright")
     tags = TagListSerializerField(help_text="""
         List of short tags to describe the article (eg."Privacy", "Copyright").
-        It must be a valid JSON list of tags.
+        It must be a valid JSON list of tags. The tags are case insensitive and
+        stored in lowercase (so Copyright === copyright).
 
         For instance ["Privacy", "Copyright"}]
         """, required=False)

apps/rp/forms.py

 from django import forms
 from django.contrib.auth.models import Group
 
-class TagMultipleChoiceField(forms.ModelMultipleChoiceField):
-    def prepare_value(self, value):
-        if hasattr(value, 'tag_id'):
-            return value.tag_id
-        elif hasattr(value, '__iter__') and not isinstance(value, str) and not hasattr(value, '_meta'):
-            return [self.prepare_value(v) for v in value]
-        else:
-            return super(TagMultipleChoiceField, self).prepare_value(value)
-
-    def clean(self, value):
-        value = self.to_python(value)
-        self.validate(value)
-        self.run_validators(value)
-        return value
-
 class SignupForm(forms.Form):
     def signup(self, request, user):
         group = Group.objects.get(name='padawan')

apps/rp/models.py

@@ -238,7 +238,7 @@ class Article(models.Model):
 
         # Let's add the tags
         if tags:
-            article.tags.set(*tags)
+            article.tags.add(*tags)
             article.save()
         try:
             r = requests.get(url, timeout=0.5)
@@ -251,6 +251,7 @@ class Article(models.Model):
 
         article.url = url
         article.save()
+        article.refresh_from_db()
         return article
 
     # Content extraction

apps/rp/tests/test_article.py

@@ -41,9 +41,14 @@ class TestArticle(TestCase):
         assert article.status == 'NEW'
         assert article.score == 1
 
-        article2 = Article.add_new_url(url='https://www.example.org/article')
+        article2 = Article.add_new_url(url='https://www.example.org/article',
+                                       tags=["Tag 1", "Tag 2"])
         assert article2.status == 'NEW'
         assert article2.score == 2
+        assert set(article2.tags.names()) == {"Tag 1", "Tag 2"}
+
+        article3 = Article.add_new_url(url='https://www.example.org/article', 
+                                       tags=["Merged Tag"])
 
     def test_flags(self):
         assert not self.article.archive
@@ -205,11 +210,13 @@ class TestArticleViews(TestCase):
         a = {'title': 'Zog Zog',
              'status': 'NEW',
              'lang': 'FR',
-             'url': 'https://www.example.org/'}
+             'url': 'https://www.example.org/',
+             'tags': ["Merged Tag"]}
         r = self.client.post('/rp/article/edit/{}/'.format(pk), a)
         a = Article.objects.get(pk=pk)
         assert r.status_code == 302  # We're redirecting to the view or preview of the article
         assert a.title == 'Zog Zog'
+        assert set(a.tags.names()) == {"merged tag"}
 
 
 class TestArticleApi(TestCase):

apps/rp/utils.py

@@ -34,3 +34,21 @@ def cleanup_url(url_path, default_scheme="http"):
         u.scheme = default_scheme
 
     return u.utf8
+
+def tag_comma_splitter(tag_string):
+    """
+    According to https://django-taggit.readthedocs.io/en/latest/custom_tagging.html,
+    this needs to be used by taggit using the settings TAGGIT_TAGS_FROM_STRING.
+
+    Our tags will be case insensitive.
+    """
+    return [t.strip().lower() for t in tag_string.split(',') if t.strip()]
+
+def tag_comma_joiner(tag_list):
+    """
+    According to https://django-taggit.readthedocs.io/en/latest/custom_tagging.html,
+    this needs to be used by taggit using the settings TAGGIT_STRING_FROM_TAGS.
+
+    Our tags will be case insensitive.
+    """
+    return ', '.join([t.name for t in tag_list])

apps/rp/views/articles.py

@@ -16,7 +16,6 @@ from crispy_forms.layout import Layout, Field, Div, HTML
 from crispy_forms.bootstrap import AppendedText
 
 from taggit.models import Tag
-from rp.forms import TagMultipleChoiceField
 
 from rp.models import Article
 
@@ -169,7 +168,9 @@ class ArticleEdit(LoginRequiredMixin, PermissionRequiredMixin, UpdateView):
             self.success_url = reverse("rp:article-view", args=[self.object.id])
         elif "publish" in self.request.POST:
             self.object.publish()
+
         self.object.save()
+        form.save_m2m()
 
         return HttpResponseRedirect(self.get_success_url())
 
@@ -180,10 +181,6 @@ class ArticleEdit(LoginRequiredMixin, PermissionRequiredMixin, UpdateView):
         form.helper = FormHelper()
         form.helper.form_tag = False
 
-        # Change the layout of the tags field
-        form.fields["tags"] = TagMultipleChoiceField(
-            queryset=Tag.objects.all(), required=False)
-
         left_layout = Div(
             Div(
                 Field('title', wrapper_class='col-sm-10'),

project/settings/apps.py

@@ -49,4 +49,9 @@ INSTALLED_APPS = DJANGO_APPS + CONTRIB_APPS + PROJECT_APPS
 # Use username for upvote instead of user object
 UND_USE_USERNAME = True
 
+# Let's use a bootstrap4 template for crispy
 CRISPY_TEMPLATE_PACK = "bootstrap4"
+
+# We're using some dumber string parsing functions in taggit
+TAGGIT_TAGS_FROM_STRING = 'rp.utils.tag_comma_splitter'
+TAGGIT_STRING_FROM_TAGS = 'rp.utils.tag_comma_joiner'