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module ActiveRecord
module ConnectionAdapters
module PostgreSQL
module ReferentialIntegrity # :nodoc:
def supports_disable_referential_integrity? # :nodoc:
true
end
def disable_referential_integrity(&block) # :nodoc:
if supports_disable_referential_integrity?
if supports_alter_constraint?
disable_referential_integrity_with_alter_constraint(&block)
else
disable_referential_integrity_with_disable_trigger(&block)
end
else
yield
end
end
private
def disable_referential_integrity_with_alter_constraint
tables_constraints = execute(<<-SQL).values
SELECT table_name, constraint_name
FROM information_schema.table_constraints
WHERE constraint_type = 'FOREIGN KEY'
AND is_deferrable = 'NO'
SQL
execute(
tables_constraints.collect { |table, constraint|
"ALTER TABLE #{quote_table_name(table)} ALTER CONSTRAINT #{constraint} DEFERRABLE"
}.join(";")
)
begin
transaction do
execute("SET CONSTRAINTS ALL DEFERRED")
yield
end
ensure
execute(
tables_constraints.collect { |table, constraint|
"ALTER TABLE #{quote_table_name(table)} ALTER CONSTRAINT #{constraint} NOT DEFERRABLE"
}.join(";")
)
end
end
def disable_referential_integrity_with_disable_trigger
original_exception = nil
begin
transaction(requires_new: true) do
execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} DISABLE TRIGGER ALL" }.join(";"))
end
rescue ActiveRecord::ActiveRecordError => e
original_exception = e
end
begin
yield
rescue ActiveRecord::InvalidForeignKey => e
warn <<-WARNING
WARNING: Rails was not able to disable referential integrity.
This is most likely caused due to missing permissions.
Rails needs superuser privileges to disable referential integrity.
cause: #{original_exception.try(:message)}
WARNING
raise e
end
begin
transaction(requires_new: true) do
execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} ENABLE TRIGGER ALL" }.join(";"))
end
rescue ActiveRecord::ActiveRecordError
end
end
end
end
end
end
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