[1.9.x] Fixed #25867 -- Fixed a system check crash with nested ArrayFields.

Thanks to Jean Gourds for the report, Tim and Claude for the review.

Backport of 59b57e672c2f5a685804cce253d2c5314c45c5fa from master

1 files changed, 11 insertions, 3 deletions

diff --git a/django/contrib/postgres/fields/array.py b/django/contrib/postgres/fields/array.py
index ff37483b4f..65f28672aa 100644
--- a/django/contrib/postgres/fields/array.py
+++ b/django/contrib/postgres/fields/array.py
@@ -29,9 +29,17 @@ class ArrayField(Field):
             self.default_validators.append(ArrayMaxLengthValidator(self.size))
         super(ArrayField, self).__init__(**kwargs)
 
-    def contribute_to_class(self, cls, name, **kwargs):
-        super(ArrayField, self).contribute_to_class(cls, name, **kwargs)
-        self.base_field.model = cls
+    @property
+    def model(self):
+        try:
+            return self.__dict__['model']
+        except KeyError:
+            raise AttributeError("'%s' object has no attribute 'model'" % self.__class__.__name__)
+
+    @model.setter
+    def model(self, model):
+        self.__dict__['model'] = model
+        self.base_field.model = model
 
     def check(self, **kwargs):
         errors = super(ArrayField, self).check(**kwargs)