Datamapper类似于find_by_方法

Question

Datamapper中是否存在ActiveRecord的find_by_方法的模拟 例如：@user = User.find_by_email(params[:email])

Answer 1

根据datamapper documentation和我的方式，您可以这样做：

@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