我有一个事件模型和一个通过参加者模型连接的用户模型。我已经弄清楚如何以经过身份验证的用户身份“参加”事件。但我想不通的是从事件中“退出”的好方法。我敢肯定这是我遗漏的一些微不足道的事情,但是有什么比询问一些微不足道的事情更好的进入 StackOverflow 的方法呢?哦,我一直在搜索 railscasts 和 SO 几个小时......
谢谢!
views/events/show.html.erb
<p><strong>Attendees: </strong>
<ul>
<% for attendee in @event.users %>
<% if attendee.username == current_user.username %>
<li><strong><%= attendee.username %></strong>
<%= link_to 'Withdraw From Event', withdraw_event_path(@event.id), :method => :post, :class => 'btn btn-danger' %>
<%= link_to 'Destroy', @attendee, confirm: 'Are you sure?', method: :delete, :class => 'btn btn-danger' %>
</li>
<% else %>
<li><%= attendee.username %></li>
<% end %>
<% end %>
</ul>
</p>
/controllers/events_controller.rb
def attend
@event = Event.find(params[:id])
current_user.events << @event
redirect_to @event, notice: 'You have promised to attend this event.'
end
def withdraw
# I can't get this to work
redirect_to @event, notice: 'You are no longer attending this event.'
end
models/event.rb
class Event < ActiveRecord::Base
attr_accessible :name, :location
belongs_to :users
has_many :attendees, :dependent => :destroy
has_many :users, :through => :attendees
models/user.rb
class User < ActiveRecord::Base
has_many :events
has_many :attendees, :dependent => :destroy
has_many :events, :through => :attendees
models/attendee.rb
class Attendee < ActiveRecord::Base
belongs_to :event
belongs_to :user
attr_accessible :user_id, :event_id
# Make sure that one user cannot join the same event more than once at a time.
validates :event_id, :uniqueness => { :scope => :user_id }
end
最佳答案
我假设您在寻找与会者时遇到了问题。
def withdraw
event = Event.find(params[:id])
attendee = Attendee.find_by_user_id_and_event_id(current_user.id, event.id)
if attendee.blank?
# handle case where there is no matching Attendee record
end
attendee.delete
redirect_to event, notice: 'You are no longer attending this event.'
end
关于ruby-on-rails - Rails has_many :through association. 删除与链接的关联?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11404094/