module Foreigner::ConnectionAdapters::Mysql2Adapter
Public Instance Methods
foreign_keys(table_name)
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# File lib/foreigner/connection_adapters/mysql2_adapter.rb, line 12 def foreign_keys(table_name) fk_info = select_all %{ SELECT fk.referenced_table_name as 'to_table' ,fk.referenced_column_name as 'primary_key' ,fk.column_name as 'column' ,fk.constraint_name as 'name' FROM information_schema.key_column_usage fk WHERE fk.referenced_column_name is not null AND fk.table_schema = '#{@config[:database]}' AND fk.table_name = '#{table_name}' } create_table_info = select_one("SHOW CREATE TABLE #{quote_table_name(table_name)}")["Create Table"] fk_info.map do |row| options = {column: row['column'], name: row['name'], primary_key: row['primary_key']} if create_table_info =~ /CONSTRAINT #{quote_column_name(row['name'])} FOREIGN KEY .* REFERENCES .*\)(?: ON DELETE (CASCADE|SET NULL|RESTRICT))?(?: (.+?))?,?$/ options[:dependent] = case $1 when 'CASCADE' then :delete when 'SET NULL' then :nullify when 'RESTRICT' then :restrict end options[:options] = $2 # e.g. ON UPDATE ... end ForeignKeyDefinition.new(table_name, row['to_table'], options) end end
remove_foreign_key_sql(table, options)
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# File lib/foreigner/connection_adapters/mysql2_adapter.rb, line 6 def remove_foreign_key_sql(table, options) foreign_key_name = decipher_foreign_key_name(table, options) "DROP FOREIGN KEY #{quote_column_name(foreign_key_name)}" end