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module Mobility
module Backend
=begin
Adds {#for} method to backend to return ORM-specific backend.
@example KeyValue backend for AR model
class Post < ActiveRecord::Base
# ...
end
Mobility::Backends::KeyValue.for(Post)
#=> Mobility::Backends::ActiveRecord::KeyValue
=end
module OrmDelegator
# @param [Class] model_class Class of model
# @return [Class] Class of backend to use for model
def for(model_class)
namespace = name.split('::'.freeze)
if Loaded::ActiveRecord && model_class < ::ActiveRecord::Base
require_backend("active_record", namespace.last.underscore)
const_get(namespace.insert(-2, "ActiveRecord".freeze).join("::".freeze))
elsif Loaded::Sequel && model_class < ::Sequel::Model
require_backend("sequel", namespace.last.underscore)
const_get(namespace.insert(-2, "Sequel".freeze).join("::".freeze))
else
raise ArgumentError, "#{namespace.last} backend can only be used by ActiveRecord or Sequel models".freeze
end
end
private
def require_backend(orm, backend)
begin
orm_backend = "mobility/backends/#{orm}/#{backend}"
require orm_backend
rescue LoadError => e
raise unless e.message =~ /#{orm_backend}/
end
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems