Rails-创建模型时的问题

Question

我使用的模型属于另外两个模型。当我尝试创建它时，我设法获得了两个ID，但内容本身没有存储在数据库中

 def create
    @person = Person.find(current_person)
    @message = Message.create(:group => Group.find(params[:group_id]), :person => Person.find(current_person))
    if @message.save
      redirect_to(:back)
    else
      redirect_to(:back)
    end
  end

<% form_for(:message, :url => messages_path(:person_id => current_person.id, :group_id => @group.id)) do |f| %>
<%= f.text_area :content %> 
<%= f.submit "Submit" %>
<%end %>

另外，content在数据库中被设置为文本，我使用的是PostgreSQL。

Answer 1

@message = Message.create params[:message].merge(:group => Group.find(params[:group_id]), :person => Person.find(current_person))

Answer 2

@为什么上面的答案应该为您做这件事。但你可以更进一步，利用联想的力量。

在你的message.rb中，你会有关联

class Message < ActiveRecord::Base
  ..
  belongs_to :group
  belongs_to :person
  ...
end

在组/个人模型中也可以有类似的关联，它声明了has_many关系。

 class Group < ActiveRecord::Base
   ...
   has_many :messages
   ...
 end
 class Person < ActiveRecord::Base
   ...
   has_many :messages
   ...
 end

在路由.rb（Rails2.3.x）中

 map.resources :group, :has_many => [:messages]

在路由.rb（Rails3）中

 resources :groups do
   resources :messages
 end

这将给你一条类似的路线

POST group_messages_path(:group_id) # => this will route to 
                                    # MessagesController's create action
                                    # and provide params[:group_id]

您使用的current_person似乎与当前登录有关，因此通过url或参数使其可见或可编辑不是一个好主意。current_person应该派生自create操作本身中的会话。

# form_for([@group,:message]) or form_for([@group,@message])
# automatically works out the path as POST /groups/:group_id/messages => MessagesController#create
# And current person association remains safe to currently logged in person
# without being revealed thru parameters and such.
<% form_for([@group,@message]) do |f| %>
  <%= f.text_area :content %> 
  <%= f.submit "Submit" %>
<% end %>

def create
  @group = Group.find(params[:group_id])
  @person = current_person # or however you find current_person
  @message = @group.messages.build(params[:messaage])
  @message.person = @person
  if @message.save
    redirect_to(:back)
  else
    redirect_to(:back)
  end
end

Answer 3

尝试更改

 @message = Message.create(:group => Group.find(params[:group_id]), :person => Person.find(current_person))

至@message = Message.create(:group => Group.find(params[:group_id]), :person => Person.find(current_person), :content => params[:content]）