Module: PGSpecHelper::PrimaryKeys

Included in:
PGSpecHelper
Defined in:
lib/pg_spec_helper/primary_keys.rb

Instance Method Summary collapse

Instance Method Details

#create_primary_key(schema_name, table_name, column_names, primary_key_name) ⇒ Object

add a primary_key to the provided table which covers the provided columns



6
7
8
9
10
11
12
13
14
 
# File 'lib/pg_spec_helper/primary_keys.rb', line 6

def create_primary_key schema_name, table_name, column_names, primary_key_name
  column_names_sql = column_names.map { |n| connection.quote_ident n.to_s }.join(", ")
  # add the primary_key
  connection.exec("    ALTER TABLE \#{schema_name}.\#{table_name}\n      ADD CONSTRAINT \#{primary_key_name}\n      PRIMARY KEY (\#{column_names_sql})\n  SQL\nend\n")

#get_primary_key_name(schema_name, table_name) ⇒ Object

get the primary_key name for the provided table



17
18
19
20
21
22
23
24
25
26
27
28
29
30
 
# File 'lib/pg_spec_helper/primary_keys.rb', line 17

def get_primary_key_name schema_name, table_name
  # get the primary_key name
  rows = connection.exec("    SELECT\n      constraint_name\n    FROM\n      information_schema.table_constraints\n    WHERE\n      table_schema = $1\n      AND table_name = $2\n      AND constraint_type = 'PRIMARY KEY'\n  SQL\n  rows.map { |r| r[\"constraint_name\"].to_sym }.first\nend\n", [schema_name.to_s, table_name.to_s])