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Code Issues 32 Releases Wiki Activity

Don't make a second migration if there was a force-null-default addcol.

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This commit is contained in:
Andrew Godwin
2013-12-04 13:56:22 +00:00
parent df800b1609
commit ce05b8a69e
3 changed files with 63 additions and 11 deletions
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12
django/db/migrations/operations/fields.py
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@@ -1,4 +1,5 @@
from django.db import router
from django.db.models.fields import NOT_PROVIDED
from .base import Operation
@@ -7,13 +8,20 @@ class AddField(Operation):
Adds a field to a model.
"""
def __init__(self, model_name, name, field):
def __init__(self, model_name, name, field, preserve_default=True):
self.model_name = model_name
self.name = name
self.field = field
self.preserve_default = preserve_default
def state_forwards(self, app_label, state):
state.models[app_label, self.model_name.lower()].fields.append((self.name, self.field))
# If preserve default is off, don't use the default for future state
if not self.preserve_default:
field = self.field.clone()
field.default = NOT_PROVIDED
else:
field = self.field
state.models[app_label, self.model_name.lower()].fields.append((self.name, field))
def database_forwards(self, app_label, schema_editor, from_state, to_state):
from_model = from_state.render().get_model(app_label, self.model_name)