diff --git a/django/core/management.py b/django/core/management.py index 799ec30d2ca..3dd9666eb5e 100644 --- a/django/core/management.py +++ b/django/core/management.py @@ -903,27 +903,32 @@ def get_validation_errors(outfile, app=None): rel_name = RelatedObject(f.rel.to, cls, f).get_accessor_name() rel_query_name = f.related_query_name() - for r in rel_opts.fields: - if r.name == rel_name: - e.add(opts, "Accessor for m2m field '%s' clashes with field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.name, f.name)) - if r.name == rel_query_name: - e.add(opts, "Reverse query name for m2m field '%s' clashes with field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.name, f.name)) - for r in rel_opts.many_to_many: - if r.name == rel_name: - e.add(opts, "Accessor for m2m field '%s' clashes with m2m field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.name, f.name)) - if r.name == rel_query_name: - e.add(opts, "Reverse query name for m2m field '%s' clashes with m2m field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.name, f.name)) - for r in rel_opts.get_all_related_many_to_many_objects(): - if r.field is not f: + # If rel_name is none, there is no reverse accessor. + # (This only occurs for symmetrical m2m relations to self). + # If this is the case, there are no clashes to check for this field, as + # there are no reverse descriptors for this field. + if rel_name is not None: + for r in rel_opts.fields: + if r.name == rel_name: + e.add(opts, "Accessor for m2m field '%s' clashes with field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.name, f.name)) + if r.name == rel_query_name: + e.add(opts, "Reverse query name for m2m field '%s' clashes with field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.name, f.name)) + for r in rel_opts.many_to_many: + if r.name == rel_name: + e.add(opts, "Accessor for m2m field '%s' clashes with m2m field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.name, f.name)) + if r.name == rel_query_name: + e.add(opts, "Reverse query name for m2m field '%s' clashes with m2m field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.name, f.name)) + for r in rel_opts.get_all_related_many_to_many_objects(): + if r.field is not f: + if r.get_accessor_name() == rel_name: + e.add(opts, "Accessor for m2m field '%s' clashes with related m2m field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.get_accessor_name(), f.name)) + if r.get_accessor_name() == rel_query_name: + e.add(opts, "Reverse query name for m2m field '%s' clashes with related m2m field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.get_accessor_name(), f.name)) + for r in rel_opts.get_all_related_objects(): if r.get_accessor_name() == rel_name: - e.add(opts, "Accessor for m2m field '%s' clashes with related m2m field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.get_accessor_name(), f.name)) + e.add(opts, "Accessor for m2m field '%s' clashes with related field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.get_accessor_name(), f.name)) if r.get_accessor_name() == rel_query_name: - e.add(opts, "Reverse query name for m2m field '%s' clashes with related m2m field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.get_accessor_name(), f.name)) - for r in rel_opts.get_all_related_objects(): - if r.get_accessor_name() == rel_name: - e.add(opts, "Accessor for m2m field '%s' clashes with related field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.get_accessor_name(), f.name)) - if r.get_accessor_name() == rel_query_name: - e.add(opts, "Reverse query name for m2m field '%s' clashes with related field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.get_accessor_name(), f.name)) + e.add(opts, "Reverse query name for m2m field '%s' clashes with related field '%s.%s'. Add a related_name argument to the definition for '%s'." % (f.name, rel_opts.object_name, r.get_accessor_name(), f.name)) # Check admin attribute. if opts.admin is not None: diff --git a/django/db/models/related.py b/django/db/models/related.py index ee3b916cf4c..ac1ec50ca29 100644 --- a/django/db/models/related.py +++ b/django/db/models/related.py @@ -131,6 +131,9 @@ class RelatedObject(object): # many-to-many objects. It uses the lower-cased object_name + "_set", # but this can be overridden with the "related_name" option. if self.field.rel.multiple: + # If this is a symmetrical m2m relation on self, there is no reverse accessor. + if getattr(self.field.rel, 'symmetrical', False) and self.model == self.parent_model: + return None return self.field.rel.related_name or (self.opts.object_name.lower() + '_set') else: return self.field.rel.related_name or (self.opts.object_name.lower()) diff --git a/tests/modeltests/invalid_models/models.py b/tests/modeltests/invalid_models/models.py index 5540c1bd5f7..2299cd85e61 100644 --- a/tests/modeltests/invalid_models/models.py +++ b/tests/modeltests/invalid_models/models.py @@ -68,15 +68,34 @@ class SelfClashForeign(models.Model): foreign_1 = models.ForeignKey("SelfClashForeign", related_name='id') foreign_2 = models.ForeignKey("SelfClashForeign", related_name='src_safe') +class ValidM2M(models.Model): + src_safe = models.CharField(maxlength=10) + validm2m = models.CharField(maxlength=10) + + # M2M fields are symmetrical by default. Symmetrical M2M fields + # on self don't require a related accessor, so many potential + # clashes are avoided. + validm2m_set = models.ManyToManyField("ValidM2M") + + m2m_1 = models.ManyToManyField("ValidM2M", related_name='id') + m2m_2 = models.ManyToManyField("ValidM2M", related_name='src_safe') + + m2m_3 = models.ManyToManyField('self') + m2m_4 = models.ManyToManyField('self') + class SelfClashM2M(models.Model): src_safe = models.CharField(maxlength=10) selfclashm2m = models.CharField(maxlength=10) - selfclashm2m_set = models.ManyToManyField("SelfClashM2M") - m2m_1 = models.ManyToManyField("SelfClashM2M", related_name='id') - m2m_2 = models.ManyToManyField("SelfClashM2M", related_name='src_safe') - + # Non-symmetrical M2M fields _do_ have related accessors, so + # there is potential for clashes. + selfclashm2m_set = models.ManyToManyField("SelfClashM2M", symmetrical=False) + + m2m_1 = models.ManyToManyField("SelfClashM2M", related_name='id', symmetrical=False) + m2m_2 = models.ManyToManyField("SelfClashM2M", related_name='src_safe', symmetrical=False) + m2m_3 = models.ManyToManyField('self', symmetrical=False) + m2m_4 = models.ManyToManyField('self', symmetrical=False) model_errors = """invalid_models.fielderrors: "charfield": CharFields require a "maxlength" attribute. invalid_models.fielderrors: "floatfield": FloatFields require a "decimal_places" attribute. @@ -147,9 +166,17 @@ invalid_models.selfclashforeign: Accessor for field 'foreign_2' clashes with fie invalid_models.selfclashforeign: Reverse query name for field 'foreign_2' clashes with field 'SelfClashForeign.src_safe'. Add a related_name argument to the definition for 'foreign_2'. invalid_models.selfclashm2m: Accessor for m2m field 'selfclashm2m_set' clashes with m2m field 'SelfClashM2M.selfclashm2m_set'. Add a related_name argument to the definition for 'selfclashm2m_set'. invalid_models.selfclashm2m: Reverse query name for m2m field 'selfclashm2m_set' clashes with field 'SelfClashM2M.selfclashm2m'. Add a related_name argument to the definition for 'selfclashm2m_set'. +invalid_models.selfclashm2m: Accessor for m2m field 'selfclashm2m_set' clashes with related m2m field 'SelfClashM2M.selfclashm2m_set'. Add a related_name argument to the definition for 'selfclashm2m_set'. invalid_models.selfclashm2m: Accessor for m2m field 'm2m_1' clashes with field 'SelfClashM2M.id'. Add a related_name argument to the definition for 'm2m_1'. invalid_models.selfclashm2m: Accessor for m2m field 'm2m_2' clashes with field 'SelfClashM2M.src_safe'. Add a related_name argument to the definition for 'm2m_2'. invalid_models.selfclashm2m: Reverse query name for m2m field 'm2m_1' clashes with field 'SelfClashM2M.id'. Add a related_name argument to the definition for 'm2m_1'. invalid_models.selfclashm2m: Reverse query name for m2m field 'm2m_2' clashes with field 'SelfClashM2M.src_safe'. Add a related_name argument to the definition for 'm2m_2'. +invalid_models.selfclashm2m: Accessor for m2m field 'm2m_3' clashes with m2m field 'SelfClashM2M.selfclashm2m_set'. Add a related_name argument to the definition for 'm2m_3'. +invalid_models.selfclashm2m: Accessor for m2m field 'm2m_3' clashes with related m2m field 'SelfClashM2M.selfclashm2m_set'. Add a related_name argument to the definition for 'm2m_3'. +invalid_models.selfclashm2m: Accessor for m2m field 'm2m_3' clashes with related m2m field 'SelfClashM2M.selfclashm2m_set'. Add a related_name argument to the definition for 'm2m_3'. +invalid_models.selfclashm2m: Accessor for m2m field 'm2m_4' clashes with m2m field 'SelfClashM2M.selfclashm2m_set'. Add a related_name argument to the definition for 'm2m_4'. +invalid_models.selfclashm2m: Accessor for m2m field 'm2m_4' clashes with related m2m field 'SelfClashM2M.selfclashm2m_set'. Add a related_name argument to the definition for 'm2m_4'. +invalid_models.selfclashm2m: Accessor for m2m field 'm2m_4' clashes with related m2m field 'SelfClashM2M.selfclashm2m_set'. Add a related_name argument to the definition for 'm2m_4'. +invalid_models.selfclashm2m: Reverse query name for m2m field 'm2m_3' clashes with field 'SelfClashM2M.selfclashm2m'. Add a related_name argument to the definition for 'm2m_3'. +invalid_models.selfclashm2m: Reverse query name for m2m field 'm2m_4' clashes with field 'SelfClashM2M.selfclashm2m'. Add a related_name argument to the definition for 'm2m_4'. """ -