config/initializers/migrate.rb

   1 if defined?(ActiveRecord::ConnectionAdapters::AbstractAdapter)
   2   module OpenStreetMap
   3     module PostgreSQL
   4       module Quoting
   5         def quote_column_name(name)
   6           Array(name).map { |n| super(n) }.join(", ")
   7         end
   8       end
   9
  10       module SchemaStatements
  11         def add_primary_key(table_name, column_name, options = {})
  12           constraint_name = "#{table_name}_pkey"
  13
  14           options = options.merge(:name => constraint_name, :unique => true)
  15
  16           add_index(table_name, column_name, **options)
  17           set_primary_key table_name, constraint_name
  18         end
  19
  20         def remove_primary_key(table_name)
  21           constraint_name = quote_table_name("#{table_name}_pkey")
  22           table_name = quote_table_name(table_name)
  23
  24           execute "ALTER TABLE #{table_name} DROP CONSTRAINT #{constraint_name}"
  25         end
  26
  27         def alter_primary_key(table_name, column_name, options = {})
  28           constraint_name = "#{table_name}_pkey"
  29           tmp_constraint_name = "#{table_name}_pkey_tmp"
  30
  31           options = options.merge(:name => tmp_constraint_name, :unique => true)
  32
  33           add_index(table_name, column_name, **options)
  34           remove_primary_key table_name
  35           set_primary_key table_name, tmp_constraint_name
  36           rename_index table_name, tmp_constraint_name, constraint_name
  37         end
  38
  39         def set_primary_key(table_name, constraint_name)
  40           constraint_name = quote_table_name(constraint_name)
  41           table_name = quote_table_name(table_name)
  42
  43           execute "ALTER TABLE #{table_name} ADD PRIMARY KEY USING INDEX #{constraint_name}"
  44         end
  45       end
  46     end
  47   end
  48
  49   ActiveRecord::ConnectionAdapters::PostgreSQL::Quoting.prepend(OpenStreetMap::PostgreSQL::Quoting)
  50   ActiveRecord::ConnectionAdapters::PostgreSQL::SchemaStatements.prepend(OpenStreetMap::PostgreSQL::SchemaStatements)
  51 end