1 # Protect referential integrity of owner_uuid columns in other tables
2 # that can refer to the uuid column in this table.
6 def self.included(base)
7 # Rails' "has_many" can prevent us from destroying the owner
8 # record when other objects refer to it.
9 ActiveRecord::Base.connection.tables.each do |t|
10 next if t == base.table_name
11 next if t == 'schema_migrations'
12 klass = t.classify.constantize
13 next unless klass and 'owner_uuid'.in?(klass.columns.collect(&:name))
14 base.has_many(t.to_sym,
15 foreign_key: :owner_uuid,
17 dependent: :restrict_with_exception)
19 # We need custom protection for changing an owner's primary
20 # key. (Apart from this restriction, admins are allowed to change
22 base.validate :restrict_uuid_change_breaking_associations
25 def descendant_project_uuids
26 install_view('ancestor')
27 ActiveRecord::Base.connection.
28 exec_query('SELECT ancestor_view.uuid
30 LEFT JOIN groups ON groups.uuid=ancestor_view.uuid
31 WHERE ancestor_uuid = $1 AND groups.group_class = $2',
32 # "name" arg is a query label that appears in logs:
33 "descendant_project_uuids for #{self.uuid}",
34 # "binds" arg is an array of [col_id, value] for '$1' vars:
35 [[nil, self.uuid], [nil, 'project']],
36 ).rows.map do |project_uuid,|
43 def restrict_uuid_change_breaking_associations
44 return true if new_record? or not uuid_changed?
46 # Check for objects that have my old uuid listed as their owner.
47 self.class.reflect_on_all_associations(:has_many).each do |assoc|
48 next unless assoc.foreign_key == :owner_uuid
49 if assoc.klass.where(owner_uuid: uuid_was).any?
51 "cannot be changed on a #{self.class} that owns objects")
56 # if I owned myself before, I'll just continue to own myself with
58 if owner_uuid == uuid_was
59 self.owner_uuid = uuid
63 def install_view(type)
64 conn = ActiveRecord::Base.connection
65 self.class.transaction do
66 # Check whether the temporary view has already been created
67 # during this connection. If not, create it.
68 conn.exec_query "SAVEPOINT check_#{type}_view"
70 conn.exec_query("SELECT 1 FROM #{type}_view LIMIT 0")
72 conn.exec_query "ROLLBACK TO SAVEPOINT check_#{type}_view"
73 sql = File.read(Rails.root.join("lib", "create_#{type}_view.sql"))
76 conn.exec_query "RELEASE SAVEPOINT check_#{type}_view"