FIXTURE_REWRITE env var will force the test to pass, existing rewriting fixtures

Author: jpic

README.rst

@@ -75,6 +75,11 @@ run though, it will pass.
 If any difference is found between the database and the test fixture, then
 ``diff()`` will return the diff as outputed by GNU diff.
 
+Instead of deleting the fixtures manually before running the tests to
+regenerate them, just run your tests with FIXTURE_REWRITE=1 environment
+variable. This will overwrite the fixtures and make the tests look like it
+passed.
+
 See tests and docstrings for crunchy details.
 
 Requirements

dbdiff/fixture.py

@@ -18,6 +18,9 @@
 )
 
 
+REWRITE = os.getenv('FIXTURE_REWRITE')
+
+
 class Fixture(object):
     """
     Is able to print out diffs between database and a fixture.
@@ -130,10 +133,11 @@ def assertNoDiff(self, exclude=None):  # noqa
 
         If a diff was found it will raise :py:class:`~exceptions.DiffFound`.
         """
-        if not self.exists:
+        if REWRITE or not self.exists:
             with open(self.path, 'w+') as f:
                 self.dump(f)
-            raise FixtureCreated(self)
+            if not REWRITE:
+                raise FixtureCreated(self)
 
         unexpected, missing, different = self.diff(exclude=exclude)