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clear disconnected records in migration

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This commit is contained in:
Raphael Sofaer 2011-02-28 16:24:09 -08:00
parent 98d8d9e0da
commit 810220bc97
1 changed files with 35 additions and 0 deletions
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35
db/migrate/20110228201109_foreign_key_constraints.rb
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@ -1,5 +1,40 @@
class ForeignKeyConstraints < ActiveRecord::Migration
def self.disconnected_records dependent_table, dep_column, parent_table
result = execute <<SQL
SELECT #{dependent_table}.id FROM #{dependent_table}
LEFT OUTER JOIN #{parent_table} ON #{dependent_table}.#{dep_column} = #{parent_table}.id
WHERE #{parent_table}.id IS NULL;
SQL
result.to_a.flatten!
end
def self.delete_disconnected_records dependent_table, dep_column, parent_table
bad_ids = disconnected_records dependent_table, dep_column, parent_table
return unless bad_ids
execute <<SQL
DELETE FROM #{dependent_table}
WHERE #{dependent_table}.id IN (#{bad_ids.join(',')}
SQL
end
def self.up
[['aspect_memberships', 'contact_id', 'contacts'],
['aspect_memberships', 'aspect_id', 'aspects'],
['comments', 'post_id', 'posts'],
['comments', 'person_id', 'people'],
['posts', 'person_id', 'people'],
['contacts', 'person_id', 'people'],
['invitations', 'sender_id', 'users'],
['invitations', 'recipient_id', 'users'],
['notification_actors', 'notification_id', 'notifications'],
['profiles', 'person_id', 'people'],
['requests', 'sender_id', 'people'],
['requests', 'recipient_id', 'people'],
['services', 'user_id', 'users']
].each do |array|
delete_disconnected_records array[0], array[1], array[2]
end
add_foreign_key(:aspect_memberships, :contacts, :dependent => :delete)
add_foreign_key(:aspect_memberships, :aspects, :dependent => :restrict)