我有一个模型 Tag 中的项目列表,我想在下拉字段中显示它。用户将选择一个,它将被添加到聊天对象中。与 Chat::Tags 存在 1:多关系,存储在标记表中。
So--用户从下拉列表中选择一个标签并单击"添加标签",聊天页面将刷新,新标签将添加到聊天页面(并作为聊天和标签的外键存储在标签表中)。
这是我所拥有的...
chats_controller.rb:
def show
@chat = Chat.find params[:id]
@tags = Tag.order(:name)
end
def update
@chat = Chat.find params[:id]
tagging = @chat.taggings.create(tag_id: params[:tag_id], coordinator: current_coordinator)
flash[:success] if tagging.present?
end
在节目中.html.haml:
.li
= form_for @chat, url: logs_chat_path(@chat), method: :put do |f|
= f.collection_select(:tag_id, @tags, :id, :name, include_blank: true)
= f.submit "Add Tag"
现在,它返回以下错误:
"exception": "NoMethodError : undefined method `tag_id' for #<Chat:0x000000073f04b0>",
--编辑--
标记表为:
["id", "chat_id", "tag_id", "coordinator_id", "created_at", "updated_at"]
耙子路线显示:
logs_chats GET /logs/chats(.:format) logs/chats#index
POST /logs/chats(.:format) logs/chats#create
new_logs_chat GET /logs/chats/new(.:format) logs/chats#new
edit_logs_chat GET /logs/chats/:id/edit(.:format) logs/chats#edit
logs_chat GET /logs/chats/:id(.:format) logs/chats#show
PATCH /logs/chats/:id(.:format) logs/chats#update
PUT /logs/chats/:id(.:format) logs/chats#update
DELETE /logs/chats/:id(.:format) logs/chats#destroy
这不起作用的原因是因为表单用于@chat
,而聊天没有名为 tag_id
的方法。在窗体中调用它的方式是使用 f
对象。如果您想更改/更新该表单中的标记...
从这里更改您的collection_select
= f.collection_select(:tag_id, @tags, :id, :name, include_blank: true)
对此
= collection_select(:taggings, :tag_id, @tags, :id, :name, include_blank: true)
然后在您的控制器中更改此内容
tagging = @chat.taggings.create(tag_id: params[:tag_id], coordinator: current_coordinator)
对此
tagging = @chat.taggings.create(tag_id: params[:taggings][:tag_id], coordinator: current_coordinator)