Rails - 创建模型时出现问题

Question

我使用的模型属于另外 2 个模型。当我尝试创建它时，我设法获取两个 id，但内容本身并未​​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 %>

此外，content 在数据库中设置为文本，并且我正在使用 PostgreSQL。

Answer 1

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

Answer 2

@why 上面的答案应该适合你。但你可以更进一步，利用联想的力量。

在您的 message.rb 中，您将具有关联，

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

您也可以在声明 has_many 关系的 Group / Person 模型中具有类似的关联。

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

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

In routes.rb (Rails 2.3.x)

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

In routes.rb (Rails 3)

 resources :groups do
   resources :messages
 end

这将为您提供一条类似于

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

You are using current_person 的路线，该路线似乎与当前登录相关，因此通过 url 或参数使其可见或可编辑并不是一个好主意。 current_person 应该从创建操作本身的会话中派生。

# 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))

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