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Code Issues 32 Releases Wiki Activity

Implement allow_migrate for migration operations

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This commit is contained in:
Andrew Godwin
2013-07-30 12:34:31 +01:00
parent 12e9804d16
commit fddc5957c5
6 changed files with 156 additions and 44 deletions
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46
django/db/migrations/operations/fields.py
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@@ -1,3 +1,4 @@
from django.db import router
from .base import Operation
@@ -17,11 +18,13 @@ class AddField(Operation):
def database_forwards(self, app_label, schema_editor, from_state, to_state):
from_model = from_state.render().get_model(app_label, self.model_name)
to_model = to_state.render().get_model(app_label, self.model_name)
schema_editor.add_field(from_model, to_model._meta.get_field_by_name(self.name)[0])
if router.allow_migrate(schema_editor.connection.alias, to_model):
schema_editor.add_field(from_model, to_model._meta.get_field_by_name(self.name)[0])
def database_backwards(self, app_label, schema_editor, from_state, to_state):
from_model = from_state.render().get_model(app_label, self.model_name)
schema_editor.remove_field(from_model, from_model._meta.get_field_by_name(self.name)[0])
if router.allow_migrate(schema_editor.connection.alias, from_model):
schema_editor.remove_field(from_model, from_model._meta.get_field_by_name(self.name)[0])
def describe(self):
return "Add field %s to %s" % (self.name, self.model_name)
@@ -45,12 +48,14 @@ class RemoveField(Operation):
def database_forwards(self, app_label, schema_editor, from_state, to_state):
from_model = from_state.render().get_model(app_label, self.model_name)
schema_editor.remove_field(from_model, from_model._meta.get_field_by_name(self.name)[0])
if router.allow_migrate(schema_editor.connection.alias, from_model):
schema_editor.remove_field(from_model, from_model._meta.get_field_by_name(self.name)[0])
def database_backwards(self, app_label, schema_editor, from_state, to_state):
from_model = from_state.render().get_model(app_label, self.model_name)
to_model = to_state.render().get_model(app_label, self.model_name)
schema_editor.add_field(from_model, to_model._meta.get_field_by_name(self.name)[0])
if router.allow_migrate(schema_editor.connection.alias, to_model):
schema_editor.add_field(from_model, to_model._meta.get_field_by_name(self.name)[0])
def describe(self):
return "Remove field %s from %s" % (self.name, self.model_name)
@@ -74,11 +79,12 @@ class AlterField(Operation):
def database_forwards(self, app_label, schema_editor, from_state, to_state):
from_model = from_state.render().get_model(app_label, self.model_name)
to_model = to_state.render().get_model(app_label, self.model_name)
schema_editor.alter_field(
from_model,
from_model._meta.get_field_by_name(self.name)[0],
to_model._meta.get_field_by_name(self.name)[0],
)
if router.allow_migrate(schema_editor.connection.alias, to_model):
schema_editor.alter_field(
from_model,
from_model._meta.get_field_by_name(self.name)[0],
to_model._meta.get_field_by_name(self.name)[0],
)
def database_backwards(self, app_label, schema_editor, from_state, to_state):
self.database_forwards(app_label, schema_editor, from_state, to_state)
@@ -105,20 +111,22 @@ class RenameField(Operation):
def database_forwards(self, app_label, schema_editor, from_state, to_state):
from_model = from_state.render().get_model(app_label, self.model_name)
to_model = to_state.render().get_model(app_label, self.model_name)
schema_editor.alter_field(
from_model,
from_model._meta.get_field_by_name(self.old_name)[0],
to_model._meta.get_field_by_name(self.new_name)[0],
)
if router.allow_migrate(schema_editor.connection.alias, to_model):
schema_editor.alter_field(
from_model,
from_model._meta.get_field_by_name(self.old_name)[0],
to_model._meta.get_field_by_name(self.new_name)[0],
)
def database_backwards(self, app_label, schema_editor, from_state, to_state):
from_model = from_state.render().get_model(app_label, self.model_name)
to_model = to_state.render().get_model(app_label, self.model_name)
schema_editor.alter_field(
from_model,
from_model._meta.get_field_by_name(self.new_name)[0],
to_model._meta.get_field_by_name(self.old_name)[0],
)
if router.allow_migrate(schema_editor.connection.alias, to_model):
schema_editor.alter_field(
from_model,
from_model._meta.get_field_by_name(self.new_name)[0],
to_model._meta.get_field_by_name(self.old_name)[0],
)
def describe(self):
return "Rename field %s on %s to %s" % (self.old_name, self.model_name, self.new_name)