I'm trying to run the Django unit tests for the first time using
runtests.py and I'm getting a lot of errors like this:
> Problem installing fixture
'/develop/django/tests/regressiontests/views/fixtures/testdata.json':
Traceback (most recent call last):
> File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/core/management/commands/loaddata.py",
line 112, in handle
> obj.save()
> File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/core/serializers/base.py",
line 168, in save
> models.Model.save_base(self.object, raw=True)
> File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/base.py",
line 334, in save_base
> result = manager._insert(values, return_id=update_pk)
> File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/manager.py",
line 127, in _insert
> return insert_query(self.model, values, **kwargs)
> File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/query.py",
line 735, in insert_query
> return query.execute_sql(return_id)
> File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/sql/subqueries.py",
line 300, in execute_sql
> cursor = super(InsertQuery, self).execute_sql(None)
> File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/sql/query.py",
line 1474, in execute_sql
> cursor.execute(sql, params)
> File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/MySQL_python-1.2.2-py2.5-macosx-10.3-fat.egg/MySQLdb/cursors.py",
line 166, in execute
> self.errorhandler(self, exc, value)
> File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/MySQL_python-1.2.2-py2.5-macosx-10.3-fat.egg/MySQLdb/connections.py",
line 35, in defaulterrorhandler
> raise errorclass, errorvalue
> IntegrityError: (1452, 'Cannot add or update a child row: a foreign
key constraint fails (`test_django_regression/views_article`, CONSTRAINT
`author_id_refs_id_559385ef` FOREIGN KEY (`author_id`) REFERENCES
`views_author` (`id`))')
As far as I can see, the errors are legitimate because
regressiontests/views/fixtures/testdata.json defines several
views.article items before it defines the views.author item that they
refer to. If I move
> {
> "pk": 1, "model": "views.author", "fields": {
> "name": "Boris"
> }
> },
to the top of the testdata.json, instead of near the bottom where it
currently is, the errors disappear. However, testdata.json has been
defined this way from the time it was created, leading me to wonder why
others haven't been having the same problem.
Note that the errors I mention above don't actually occur as unit test
failures (though they do cause other failures to occur): instead, they
appear in the progress information while the unit tests are running.
Mike
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