控制器中的集合复选框

Question

这是我在rails中的应用程序的一部分： 如何从复选框中获取帖子控制器中的值？ 我想从复选框中获取ID数组。 帖子已创建，但我无法访问从复选框中获取的ID数组。

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class Categoryofpost < ActiveRecord::Base
	belongs_to :post
	belongs_to :category
end


............................

In views/posts/new.html.erb
<%= form_for @post do |p| %>
	<%= p.label :title %>
	<%= p.text_field :title %>
	<br>
	<%= p.label :body %>
	<%= p.text_area :body %>
	<br>
	<p>Related to : </p>
	<br>
	<%= p.collection_check_boxes :category_ids, Category.all, :id, :name %>
	<br>
	<%= p.submit "Create" %>
<% end %>

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class Category < ActiveRecord::Base
	belongs_to :user
	validates :name, uniqueness: true
	has_many :categoryofposts
	has_many :related_posts, class_name: "Post", through: :categoryofposts , source: :post
end

....................
In the posts controler
def create
		@post_params = post_params
		#@post_params[:user_id] = 1 #session[:user_id]
		@post = Post.new(@post_params)
		if @post.save
			# @cat = get_categories
			# @cat.each do |c|
			# 	Categoryofpost.create(post_id: @post.id, category_id: c)
			# end
			redirect_to @post, notice: "The post has been posted successfully."
		else
			render action: :new, alert: "The post has not been posted."
		end
	end

  protected
	def post_params
		params.require(:post).permit(:title, :body, categoy_ids: [])
	end
	def get_categories
		params.require(:post).permit(categoy_ids: [])
	end

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class Post < ActiveRecord::Base
	belongs_to :user, dependent: :destroy
	has_many :categoryofposts
	has_many :categories, through: :categoryofposts
end

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Answer 1

你的post_params方法中有一个拼写错误。它应该是

def post_params
  params.require(:post).permit(:title, :body, category_ids: [])
end

注意 category_ids 。