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require 'rails/generators/active_record'
module ActiveRecord
module Generators # :nodoc:
class MigrationGenerator < Base # :nodoc:
argument :attributes, :type => :array, :default => [], :banner => "field[:type][:index] field[:type][:index]"
def create_migration_file
set_local_assigns!
validate_file_name!
migration_template "migration.rb", "db/migrate/#{file_name}.rb"
end
protected
attr_reader :migration_action, :join_tables
def set_local_assigns!
case file_name
when /^(add|remove)_.*_(?:to|from)_(.*)/
@migration_action = $1
@table_name = $2.pluralize
when /join_table/
if attributes.length == 2
@migration_action = 'join'
@join_tables = attributes.map(&:plural_name)
set_index_names
end
end
end
def set_index_names
attributes.each_with_index do |attr, i|
attr.index_name = [attr, attributes[i - 1]].map{ |a| index_name_for(a) }
end
end
def index_name_for(attribute)
if attribute.foreign_key?
attribute.name
else
attribute.name.singularize.foreign_key
end.to_sym
end
private
def validate_file_name!
unless file_name =~ /^[_a-z0-9]+$/
raise IllegalMigrationNameError.new(file_name)
end
end
end
end
end
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