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Revert "[1.7.x] Fixed #23938 -- Added migration support for m2m to concrete fields and vice versa"
This reverts commit 1702bc52cc.
This doesn't work on stable/1.7.x because #23844 wasn't backported and we're
not willing to do so because it's a large change.
This commit is contained in:
Tim Graham
@@ -778,71 +778,73 @@ class MigrationAutodetector(object):
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Fields that have been added
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"""
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for app_label, model_name, field_name in sorted(self.new_field_keys - self.old_field_keys):
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self._generate_added_field(app_label, model_name, field_name)
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def _generate_added_field(self, app_label, model_name, field_name):
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field = self.new_apps.get_model(app_label, model_name)._meta.get_field_by_name(field_name)[0]
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# Fields that are foreignkeys/m2ms depend on stuff
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dependencies = []
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if field.rel and field.rel.to:
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# Account for FKs to swappable models
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swappable_setting = getattr(field, 'swappable_setting', None)
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if swappable_setting is not None:
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dep_app_label = "__setting__"
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dep_object_name = swappable_setting
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field = self.new_apps.get_model(app_label, model_name)._meta.get_field_by_name(field_name)[0]
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# Fields that are foreignkeys/m2ms depend on stuff
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dependencies = []
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if field.rel and field.rel.to:
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# Account for FKs to swappable models
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swappable_setting = getattr(field, 'swappable_setting', None)
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if swappable_setting is not None:
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dep_app_label = "__setting__"
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dep_object_name = swappable_setting
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else:
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dep_app_label = field.rel.to._meta.app_label
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dep_object_name = field.rel.to._meta.object_name
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dependencies = [(dep_app_label, dep_object_name, None, True)]
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if getattr(field.rel, "through", None) and not field.rel.through._meta.auto_created:
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dependencies.append((
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field.rel.through._meta.app_label,
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field.rel.through._meta.object_name,
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None,
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True
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))
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# You can't just add NOT NULL fields with no default or fields
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# which don't allow empty strings as default.
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if (not field.null and not field.has_default() and
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not isinstance(field, models.ManyToManyField) and
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not (field.blank and field.empty_strings_allowed)):
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field = field.clone()
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field.default = self.questioner.ask_not_null_addition(field_name, model_name)
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self.add_operation(
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app_label,
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operations.AddField(
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model_name=model_name,
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name=field_name,
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field=field,
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preserve_default=False,
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),
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dependencies=dependencies,
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)
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else:
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dep_app_label = field.rel.to._meta.app_label
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dep_object_name = field.rel.to._meta.object_name
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dependencies = [(dep_app_label, dep_object_name, None, True)]
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if getattr(field.rel, "through", None) and not field.rel.through._meta.auto_created:
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dependencies.append((
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field.rel.through._meta.app_label,
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field.rel.through._meta.object_name,
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None,
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True,
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))
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# You can't just add NOT NULL fields with no default or fields
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# which don't allow empty strings as default.
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preserve_default = True
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if (not field.null and not field.has_default() and
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not isinstance(field, models.ManyToManyField) and
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not (field.blank and field.empty_strings_allowed)):
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field = field.clone()
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field.default = self.questioner.ask_not_null_addition(field_name, model_name)
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preserve_default = False
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self.add_operation(
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app_label,
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operations.AddField(
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model_name=model_name,
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name=field_name,
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field=field,
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preserve_default=preserve_default,
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),
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dependencies=dependencies,
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)
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self.add_operation(
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app_label,
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operations.AddField(
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model_name=model_name,
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name=field_name,
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field=field,
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),
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dependencies=dependencies,
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)
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def generate_removed_fields(self):
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"""
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Fields that have been removed.
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"""
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for app_label, model_name, field_name in sorted(self.old_field_keys - self.new_field_keys):
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self._generate_removed_field(app_label, model_name, field_name)
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def _generate_removed_field(self, app_label, model_name, field_name):
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self.add_operation(
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app_label,
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operations.RemoveField(
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model_name=model_name,
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name=field_name,
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),
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# We might need to depend on the removal of an
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# order_with_respect_to or index/unique_together operation;
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# this is safely ignored if there isn't one
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dependencies=[
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(app_label, model_name, field_name, "order_wrt_unset"),
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(app_label, model_name, field_name, "foo_together_change"),
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],
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)
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self.add_operation(
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app_label,
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operations.RemoveField(
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model_name=model_name,
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name=field_name,
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),
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# We might need to depend on the removal of an
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# order_with_respect_to or index/unique_together operation;
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# this is safely ignored if there isn't one
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dependencies=[
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(app_label, model_name, field_name, "order_wrt_unset"),
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(app_label, model_name, field_name, "foo_together_change"),
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],
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)
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def generate_altered_fields(self):
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"""
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@@ -866,30 +868,25 @@ class MigrationAutodetector(object):
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old_field_dec = self.deep_deconstruct(old_field)
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new_field_dec = self.deep_deconstruct(new_field)
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if old_field_dec != new_field_dec:
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if (not isinstance(old_field, models.ManyToManyField) and
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preserve_default = True
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if (old_field.null and not new_field.null and not new_field.has_default() and
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not isinstance(new_field, models.ManyToManyField)):
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preserve_default = True
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if (old_field.null and not new_field.null and not new_field.has_default() and
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not isinstance(new_field, models.ManyToManyField)):
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field = new_field.clone()
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new_default = self.questioner.ask_not_null_alteration(field_name, model_name)
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if new_default is not models.NOT_PROVIDED:
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field.default = new_default
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preserve_default = False
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else:
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field = new_field
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self.add_operation(
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app_label,
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operations.AlterField(
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model_name=model_name,
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name=field_name,
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field=field,
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preserve_default=preserve_default,
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)
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)
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field = new_field.clone()
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new_default = self.questioner.ask_not_null_alteration(field_name, model_name)
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if new_default is not models.NOT_PROVIDED:
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field.default = new_default
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preserve_default = False
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else:
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self._generate_removed_field(app_label, model_name, field_name)
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self._generate_added_field(app_label, model_name, field_name)
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field = new_field
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self.add_operation(
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app_label,
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operations.AlterField(
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model_name=model_name,
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name=field_name,
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field=field,
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preserve_default=preserve_default,
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)
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)
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def _generate_altered_foo_together(self, operation):
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option_name = operation.option_name
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