mirror of
https://github.com/jazzband/django-categories.git
synced 2026-03-16 22:30:24 +00:00
91 lines
No EOL
3.5 KiB
Python
91 lines
No EOL
3.5 KiB
Python
from django.db import models, DatabaseError
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from south.db import db
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from south.signals import post_migrate
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from .fields import CategoryM2MField, CategoryFKField
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from .models import Category
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from categories import model_registry, field_registry
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def migrate_app(app, *args, **kwargs):
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"""
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Migrate all models of this app registered
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"""
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# pull the information from the registry
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if not isinstance(app, basestring):
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return
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fields = [fld for fld in field_registry.keys() if fld.startswith(app)]
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# call the south commands to add the fields/tables
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for fld in fields:
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app_name, model_name, field_name = fld.split('.')
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# Table is typically appname_modelname, but it could be different
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# always best to be sure.
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mdl = models.get_model(app_name, model_name)
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if isinstance(field_registry[fld], CategoryFKField):
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print "Adding ForeignKey %s to %s" % (field_name, model_name)
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try:
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db.start_transaction()
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table_name = mdl._meta.db_table
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field_registry[fld].default=-1
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db.add_column(table_name, field_name, field_registry[fld], keep_default=False)
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db.commit_transaction()
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except DatabaseError, e:
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db.rollback_transaction()
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if "already exists" in str(e):
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print "Already exists"
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else:
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raise e
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elif isinstance(field_registry[fld], CategoryM2MField):
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print "Adding Many2Many table between %s and %s" % (model_name, 'category')
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table_name = "%s_%s" % (mdl._meta.db_table, 'categories')
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try:
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db.start_transaction()
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db.create_table(table_name, (
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('id', models.AutoField(verbose_name='ID', primary_key=True, auto_created=True)),
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(model_name, models.ForeignKey(mdl, null=False)),
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('category', models.ForeignKey(Category, null=False))
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))
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db.create_unique(table_name, ['%s_id' % model_name, 'category_id'])
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db.commit_transaction()
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except DatabaseError, e:
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db.rollback_transaction()
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if "already exists" in str(e):
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print "Already exists"
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else:
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raise e
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def drop_field(app_name, model_name, field_name):
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"""
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Drop the given field from the app's model
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"""
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# Table is typically appname_modelname, but it could be different
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# always best to be sure.
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mdl = models.get_model(app_name, model_name)
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fld = "%s.%s.%s" % (app_name, model_name, field_name)
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if isinstance(field_registry[fld], CategoryFKField):
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print "Dropping ForeignKey %s from %s" % (field_name, model_name)
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try:
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db.start_transaction()
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table_name = mdl._meta.db_table
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db.delete_column(table_name, field_name)
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db.commit_transaction()
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except DatabaseError, e:
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db.rollback_transaction()
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raise e
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elif isinstance(field_registry[fld], CategoryM2MField):
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print "Dropping Many2Many table between %s and %s" % (model_name, 'category')
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table_name = "%s_%s" % (mdl._meta.db_table, 'categories')
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try:
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db.start_transaction()
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db.delete_table(table_name, cascade=False)
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db.commit_transaction()
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except DatabaseError, e:
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db.rollback_transaction()
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raise e
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post_migrate.connect(migrate_app) |