1
我想通過在帖子和標籤之間添加標籤來構建一個多對多的關聯。用戶可以通過檢查已有標籤來創建帶有標籤的帖子。但我不知道如何創建嵌套表單並保存關聯。如何使用複選框添加標籤到帖子？
我的形式
<%= form_for(@post) do |f| %>
<div class="field">
<%= f.label :text %><br />
<%= f.text_field :text %>
</div>
<div>
<%= hidden_field_tag "post[tag_ids][]", nil %>
<% Tag.all.each do |tag| %>
<%= check_box_tag "post[tag_ids][]", tag.id, @post.tag_ids.include?(tag.id) %>
<%= tag.name %>
<% end %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
帖子，這裏控制器：
class PostsController < ApplicationController
def index
@posts = Post.all
end
def new
@post = Post.new
end
def create
@post = Post.new(post_params)
if @post.save
redirect_to @post
else
render 'new'
end
end
def show
@post = Post.find(params[:id])
end
private
def post_params
params.require(:post).permit(:text)
end
end
型號
class Post < ActiveRecord::Base
has_many :taggings
has_many :tags, :through => :taggings
end
class Tag < ActiveRecord::Base
has_many :taggings
has_many :posts, :through => :taggings
end
class Tagging < ActiveRecord::Base
belongs_to :tag
belongs_to :post
end