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require "rails/generators/active_record"
require "active_support/core_ext/regexp"
module ActiveRecord
module Generators # :nodoc:
class MigrationGenerator < Base # :nodoc:
argument :attributes, type: :array, default: [], banner: "field[:type][:index] field[:type][:index]"
class_option :primary_key_type, type: :string, desc: "The type for primary key"
def create_migration_file
set_local_assigns!
validate_file_name!
migration_template @migration_template, "db/migrate/#{file_name}.rb"
end
protected
attr_reader :migration_action, :join_tables
# Sets the default migration template that is being used for the generation of the migration.
# Depending on command line arguments, the migration template and the table name instance
# variables are set up.
def set_local_assigns!
@migration_template = "migration.rb"
case file_name
when /^(add|remove)_.*_(?:to|from)_(.*)/
@migration_action = $1
@table_name = normalize_table_name($2)
when /join_table/
if attributes.length == 2
@migration_action = "join"
@join_tables = pluralize_table_names? ? attributes.map(&:plural_name) : attributes.map(&:singular_name)
set_index_names
end
when /^create_(.+)/
@table_name = normalize_table_name($1)
@migration_template = "create_table_migration.rb"
end
end
def set_index_names
attributes.each_with_index do |attr, i|
attr.index_name = [attr, attributes[i - 1]].map{ |a| index_name_for(a) }
end
end
def index_name_for(attribute)
if attribute.foreign_key?
attribute.name
else
attribute.name.singularize.foreign_key
end.to_sym
end
private
def attributes_with_index
attributes.select { |a| !a.reference? && a.has_index? }
end
# A migration file name can only contain underscores (_), lowercase characters,
# and numbers 0-9. Any other file name will raise an IllegalMigrationNameError.
def validate_file_name!
unless /^[_a-z0-9]+$/.match?(file_name)
raise IllegalMigrationNameError.new(file_name)
end
end
def normalize_table_name(_table_name)
pluralize_table_names? ? _table_name.pluralize : _table_name.singularize
end
end
end
end
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