的DataMapper的模擬find_by_方法

Question

是否有任何模擬的ActiveRecord的find_by_方法的DataMapper 例如：@user = User.find_by_email(params[:email])

Answer 1

根據datamapper documentation，我做到這一點，你可以這樣做：

@user = User.first(:email => params[email]) #strictly the same as find_by_email in Activerecord 
@user = User.all(:email => params[email]) #strictly the same as find_all_by_email in Activerecord 
@user = User.last(:email => params[email]) #no real equivalent in Active Record