我有一些代码用于在linq中强类型Includes(),就像这样......
public static ObjectQuery<T> Include<T>(this ObjectQuery<T> mainQuery, Expression<Func<T, object>> subSelector)
{
return mainQuery.Include(((subSelector.Body as MemberExpression).Member as System.Reflection.PropertyInfo).Name);
}
/// <summary>
/// Old way: (from dbUser in DataSource.DataContext.Users.Include("UserSubscriptions.ChurchSubscriptions") select dbUser);
/// New way: (from dbUser in DataSource.DataContext.Users.Include<Users, UserSubscriptions>(u => u.UserSubscriptions, s => s.ChurchSubscriptions) select dbUser);
/// </summary>
public static ObjectQuery<T> Include<T, Q>(this ObjectQuery<T> mainQuery, Expression<Func<T, object>> tSubSelector, Expression<Func<Q, object>> qSubSelector)
{
string tProperty = ((tSubSelector.Body as MemberExpression).Member as System.Reflection.PropertyInfo).Name;
string qProperty = ((qSubSelector.Body as MemberExpression).Member as System.Reflection.PropertyInfo).Name;
string path = string.Format("{0}.{1}", …我有一个父模型,正在通过诸如'@ client.update_attributes(params [:client]'之类的参数进行更新.在我的参数中是一个销毁'client_card'的调用.我在client_card上有一个before_destroy方法来阻止它我的before_destroy方法正在运行,但是,更新时,before_destroy上的错误不会传播到相关模型.有关如何在更新时将此模型错误传播到关联模型的任何建议吗？
class Client < ActiveRecord::Base
has_many :client_cards, :dependent => :destroy
validates_associated :client_cards
class ClientCard < ActiveRecord::Base
belongs_to :client, :foreign_key => 'client_id'
attr_accessible :id, :client_id, :card_hash, :last_four, :exp_date
before_destroy :check_relationships
def check_finished_appointments
appointments = Appointment.select { |a| a.client_card == self && !a.has_started }
if(appointments && appointments.length > 0 )
errors.add(:base, "This card is tied to an appointment that hasn't occurred yet.")
return false
else
return true
end
end
end
我有一个内容脚本,它将iframe注入到我的页面的DOM中.这个iframe没有src属性,我用它的内容动态创建它...
iframe.src = 'data:text/html;charset=utf-8,' + encodeURI(html);
如何在此iframe上运行我的内容脚本？或者与后台沟通？我需要从此代码中触发"关闭我的iframe"事件.我知道这是可能的,因为亲爱的就是这样做的.
https://chrome.google.com/webstore/detail/honey/bmnlcjabgnpnenekpadlanbbkooimhnj?hl=en-US