Merge branch 'blueyed-deconstruct-keep-non-defaults' into develop

Conflicts:
	taggit/managers.py

taggit/managers.py

@@ -220,12 +220,14 @@ class TaggableManager(RelatedField, Field):
     _related_name_counter = 0
 
     def __init__(self, verbose_name=_("Tags"), help_text=_("A comma-separated list of tags."),
-            through=None, blank=False, related_name=None, manager=_TaggableManager):
+            through=None, blank=False, related_name=None, to=None,
+            manager=_TaggableManager):
         Field.__init__(self, verbose_name=verbose_name, help_text=help_text, blank=blank, null=True, serialize=False)
         self.through = through or TaggedItem
         self.rel = TaggableRel(self, related_name, self.through)
         self.swappable = False
         self.manager = manager
+        # NOTE: `to` is ignored, only used via `deconstruct`.
 
     def __get__(self, instance, model):
         if instance is not None and instance.pk is None:
@@ -240,9 +242,17 @@ class TaggableManager(RelatedField, Field):
         return manager
 
     def deconstruct(self):
+        """
+        Deconstruct the object, used with migrations.
+        """
         name, path, args, kwargs = super(TaggableManager, self).deconstruct()
+        # Remove forced kwargs.
         for kwarg in ('serialize', 'null'):
             del kwargs[kwarg]
+        # Add arguments related to relations.
+        # Ref: https://github.com/alex/django-taggit/issues/206#issuecomment-37578676
+        kwargs['through'] = self.through
+        kwargs['to'] = self.through._meta.get_field("tag").rel.to
         return name, path, args, kwargs
 
     def contribute_to_class(self, cls, name):

tests/tests.py

 from __future__ import unicode_literals, absolute_import
 
 from unittest import TestCase as UnitTestCase
+from unittest import skipIf
 
 import django
 from django.conf import settings
@@ -547,3 +548,12 @@ class TagStringParseTestCase(UnitTestCase):
         self.assertEqual(edit_string_for_tags([plain, spaces, comma]), '"com,ma", "spa ces", plain')
         self.assertEqual(edit_string_for_tags([plain, comma]), '"com,ma", plain')
         self.assertEqual(edit_string_for_tags([comma, spaces]), '"com,ma", "spa ces"')
+
+
+@skipIf(django.VERSION < (1, 7), "not relevant for Django < 1.7")
+class DeconstructTestCase(UnitTestCase):
+    def test_deconstruct_kwargs_kept(self):
+        instance = TaggableManager(through=OfficialThroughModel)
+        name, path, args, kwargs = instance.deconstruct()
+        new_instance = TaggableManager(*args, **kwargs)
+        self.assertEqual(instance.rel.through, new_instance.rel.through)