Fixed #556 -- ManyToManyField join tables no longer assume the primary keys of both associated tables are integers. Also added unit tests to confirm.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@682 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/management.py

@@ -44,6 +44,11 @@ def _get_contenttype_insert(opts):
 def _is_valid_dir_name(s):
     return bool(re.search(r'^\w+$', s))
 
+# If the foreign key points to an AutoField, the foreign key should be an
+# IntegerField, not an AutoField. Otherwise, the foreign key should be the same
+# type of field as the field to which it points.
+get_rel_data_type = lambda f: (f.__class__.__name__ == 'AutoField') and 'IntegerField' or f.__class__.__name__
+
 def get_sql_create(mod):
     "Returns a list of the CREATE TABLE SQL statements for the given module."
     from django.core import db, meta
@@ -54,14 +59,7 @@ def get_sql_create(mod):
         for f in opts.fields:
             if isinstance(f, meta.ForeignKey):
                 rel_field = f.rel.get_related_field()
-                # If the foreign key points to an AutoField, the foreign key
+                data_type = get_rel_data_type(rel_field)
-                # should be an IntegerField, not an AutoField. Otherwise, the
-                # foreign key should be the same type of field as the field
-                # to which it points.
-                if rel_field.__class__.__name__ == 'AutoField':
-                    data_type = 'IntegerField'
-                else:
-                    data_type = rel_field.__class__.__name__
             else:
                 rel_field = f
                 data_type = f.__class__.__name__
@@ -94,9 +92,9 @@ def get_sql_create(mod):
             table_output = ['CREATE TABLE %s (' % f.get_m2m_db_table(opts)]
             table_output.append('    id %s NOT NULL PRIMARY KEY,' % db.DATA_TYPES['AutoField'])
             table_output.append('    %s_id %s NOT NULL REFERENCES %s (%s),' % \
-                (opts.object_name.lower(), db.DATA_TYPES['IntegerField'], opts.db_table, opts.pk.column))
+                (opts.object_name.lower(), db.DATA_TYPES[get_rel_data_type(opts.pk)] % opts.pk.__dict__, opts.db_table, opts.pk.column))
             table_output.append('    %s_id %s NOT NULL REFERENCES %s (%s),' % \
-                (f.rel.to.object_name.lower(), db.DATA_TYPES['IntegerField'], f.rel.to.db_table, f.rel.to.pk.column))
+                (f.rel.to.object_name.lower(), db.DATA_TYPES[get_rel_data_type(f.rel.to.pk)] % f.rel.to.pk.__dict__, f.rel.to.db_table, f.rel.to.pk.column))
             table_output.append('    UNIQUE (%s_id, %s_id)' % (opts.object_name.lower(), f.rel.to.object_name.lower()))
             table_output.append(');')
             final_output.append('\n'.join(table_output))

django/core/meta/__init__.py

@@ -893,7 +893,6 @@ def method_get_many_to_many(field_with_rel, self):
 # Handles setting many-to-many relationships.
 # Example: Poll.set_sites()
 def method_set_many_to_many(rel_field, self, id_list):
-    id_list = map(int, id_list) # normalize to integers
     current_ids = [obj.id for obj in method_get_many_to_many(rel_field, self)]
     ids_to_add, ids_to_delete = dict([(i, 1) for i in id_list]), []
     for current_id in current_ids:

tests/testapp/models/custom_pk.py

@@ -17,6 +17,16 @@ class Employee(meta.Model):
     def __repr__(self):
         return "%s %s" % (self.first_name, self.last_name)
 
+class Business(meta.Model):
+    name = meta.CharField(maxlength=20, primary_key=True)
+    employees = meta.ManyToManyField(Employee)
+    class META:
+        verbose_name_plural = 'businesses'
+        module_name = 'businesses'
+
+    def __repr__(self):
+        return self.name
+
 API_TESTS = """
 >>> dan = employees.Employee(employee_code='ABC123', first_name='Dan', last_name='Jones')
 >>> dan.save()
@@ -43,4 +53,13 @@ EmployeeDoesNotExist: Employee does not exist for {'pk': 'foo'}
 >>> fran.save()
 >>> employees.get_list(last_name__exact='Jones')
 [Dan Jones, Fran Jones]
+
+>>> b = businesses.Business(name='Sears')
+>>> b.save()
+>>> b.set_employees([dan.employee_code, fran.employee_code])
+True
+>>> b.get_employee_list()
+[Dan Jones, Fran Jones]
+>>> fran.get_business_list()
+[Sears]
 """