magic-removal: Fixes #1343 -- Modified model validator to only validate the model being installed. Includes unit test framework changes to allow validation tests.

git-svn-id: http://code.djangoproject.com/svn/django/branches/magic-removal@2310 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/management.py

@@ -524,7 +524,7 @@ def install(app):
 
     # First, try validating the models.
     s = StringIO()
-    num_errors = get_validation_errors(s)
+    num_errors = get_validation_errors(s, app)
     if num_errors:
         sys.stderr.write("Error: %s couldn't be installed, because there were errors in your model:\n" % app_name)
         s.seek(0)
@@ -559,7 +559,7 @@ def reset(app):
 
     # First, try validating the models.
     s = StringIO()
-    num_errors = get_validation_errors(s)
+    num_errors = get_validation_errors(s, app)
     if num_errors:
         sys.stderr.write("Error: %s couldn't be installed, because there were errors in your model:\n" % app_name)
         s.seek(0)
@@ -819,13 +819,17 @@ class ModelErrorCollection:
         self.errors.append((opts, error))
         self.outfile.write("%s.%s: %s\n" % (opts.app_label, opts.module_name, error))
 
-def get_validation_errors(outfile):
-    "Validates all installed models. Writes errors, if any, to outfile. Returns number of errors."
+def get_validation_errors(outfile, app=None):
+    """
+    Validates all models that are part of the specified app. If no app name is provided, 
+    validates all models of all installed apps. Writes errors, if any, to outfile. 
+    Returns number of errors.
+    """
     from django.db import models
     from django.db.models.fields.related import RelatedObject
 
     e = ModelErrorCollection(outfile)
-    for cls in models.get_models():
+    for cls in models.get_models(app):
         opts = cls._meta
 
         # Do field-specific validation.
@@ -864,6 +868,9 @@ def get_validation_errors(outfile):
             # existing fields, m2m fields, m2m related objects or related objects
             if f.rel:
                 rel_opts = f.rel.to._meta
+                if f.rel.to not in models.get_models():
+                     e.add(opts, "'%s' field: relates to uninstalled model %s" % (f.name, rel_opts.object_name))
+                    
                 rel_name = RelatedObject(f.rel.to, cls, f).OLD_get_accessor_name()
                 if rel_name in [r.name for r in rel_opts.fields]:
                     e.add(opts, "'%s.%s' related field: Clashes with field on '%s.%s'" % (opts.object_name, f.name, rel_opts.object_name, rel_name))
@@ -879,6 +886,9 @@ def get_validation_errors(outfile):
             # existing fields, m2m fields, m2m related objects or related objects
             if f.rel:
                 rel_opts = f.rel.to._meta
+                if f.rel.to not in models.get_models():
+                    e.add(opts, "'%s' field: has m2m relation with uninstalled model %s" % (f.name, rel_opts.object_name))
+
                 rel_name = RelatedObject(f.rel.to, cls, f).OLD_get_accessor_name()
                 if rel_name in [r.name for r in rel_opts.fields]:
                     e.add(opts, "'%s.%s' related m2m field: Clashes with field on '%s.%s'" % (opts.object_name, f.name, rel_opts.object_name, rel_name))

tests/modeltests/invalid_models/__init__.py

@@ -0,0 +1 @@
+

tests/modeltests/invalid_models/models.py

@@ -0,0 +1,26 @@
+"""
+26. A test to check that the model validator works can correctly identify errors in a model. 
+"""
+
+from django.db import models
+
+class FieldErrors(models.Model):
+    charfield = models.CharField()
+    floatfield = models.FloatField()
+    filefield = models.FileField()
+    prepopulate = models.CharField(maxlength=10, prepopulate_from='bad')
+    choices = models.CharField(maxlength=10, choices='bad')
+    choices2 = models.CharField(maxlength=10, choices=[(1,2,3),(1,2,3)])
+    index = models.CharField(maxlength=10, db_index='bad')    
+
+
+error_log = """invalid_models.fielderrors: "charfield" field: CharFields require a "maxlength" attribute.
+invalid_models.fielderrors: "floatfield" field: FloatFields require a "decimal_places" attribute.
+invalid_models.fielderrors: "floatfield" field: FloatFields require a "max_digits" attribute.
+invalid_models.fielderrors: "filefield" field: FileFields require an "upload_to" attribute.
+invalid_models.fielderrors: "prepopulate" field: prepopulate_from should be a list or tuple.
+invalid_models.fielderrors: "choices" field: "choices" should be either a tuple or list.
+invalid_models.fielderrors: "choices2" field: "choices" should be a sequence of two-tuples.
+invalid_models.fielderrors: "choices2" field: "choices" should be a sequence of two-tuples.
+invalid_models.fielderrors: "index" field: "db_index" should be either None, True or False.
+"""

tests/runtests.py

@@ -82,6 +82,14 @@ class TestRunner:
 
         # Determine which models we're going to test.
         test_models = get_test_models()
+        if 'othertests' in self.which_tests:
+            self.which_tests.remove('othertests')
+            run_othertests = True
+            if not self.which_tests:
+                test_models = []
+        else:
+            run_othertests = not self.which_tests
+            
         if self.which_tests:
             # Only run the specified tests.
             bad_models = [m for m in self.which_tests if m not in test_models]
@@ -138,21 +146,39 @@ class TestRunner:
             except Exception, e:
                 log_error(model_name, "Error while importing", ''.join(traceback.format_exception(*sys.exc_info())[1:]))
                 continue
-            self.output(1, "%s model: Installing" % model_name)
-            management.install(mod)
+                
+            if not getattr(mod, 'error_log', None):
+                # Model is not marked as an invalid model
+                self.output(1, "%s model: Installing" % model_name)
+                management.install(mod)
 
-            # Run the API tests.
-            p = doctest.DocTestParser()
-            test_namespace = dict([(m._meta.object_name, m) \
-                                    for m in django.db.models.get_models(mod)])
-            dtest = p.get_doctest(mod.API_TESTS, test_namespace, model_name, None, None)
-            # Manually set verbose=False, because "-v" command-line parameter
-            # has side effects on doctest TestRunner class.
-            runner = DjangoDoctestRunner(verbosity_level=verbosity_level, verbose=False)
-            self.output(1, "%s model: Running tests" % model_name)
-            runner.run(dtest, clear_globs=True, out=sys.stdout.write)
+                # Run the API tests.
+                p = doctest.DocTestParser()
+                test_namespace = dict([(m._meta.object_name, m) \
+                                        for m in django.db.models.get_models(mod)])
+                dtest = p.get_doctest(mod.API_TESTS, test_namespace, model_name, None, None)
+                # Manually set verbose=False, because "-v" command-line parameter
+                # has side effects on doctest TestRunner class.
+                runner = DjangoDoctestRunner(verbosity_level=verbosity_level, verbose=False)
+                self.output(1, "%s model: Running tests" % model_name)
+                runner.run(dtest, clear_globs=True, out=sys.stdout.write)
+            else: 
+                # Check that model known to be invalid is invalid for the right reasons.
+                self.output(1, "%s model: Validating" % model_name)
+            
+                from cStringIO import StringIO
+                s = StringIO()
+                count = management.get_validation_errors(s, mod)
+                s.seek(0)
+                error_log = s.read()
+                expected = len(mod.error_log.split('\n')) - 1
+                if error_log != mod.error_log:
+                    log_error(model_name,
+                        "Validator found %d validation errors, %d expected" % (count, expected),
+                        "Expected errors:\n%s\n\nActual errors:\n%s" % (mod.error_log, error_log))
 
-        if not self.which_tests:
+
+        if run_othertests:
             # Run the non-model tests in the other tests dir
             self.output(1, "Running other tests")
             other_tests_dir = os.path.join(os.path.dirname(__file__), OTHER_TESTS_DIR)