Question

这是我所拥有的表格的片段。分配：title和：description在创建模型＆＃34; Post＆＃34;时工作得很好，但是当我尝试将category_id指定为1并且它没有分配任何内容时，category_id仍为nil。< / p>

.form-group
        = f.input :title, input_html: { class: 'form-control' }

.form-group
        = f.input :description, input_html: { class: 'form-control' }

.form-group
        = f.input :category_id, input_html: { class: 'form-control' }

使用Post.find_by时（标题：＆＃39; posty＆＃39;（我给帖子的标题））我明白了......

 => #<Post id: 13, title: "posty", description: "eyyyyyy", created_at: "2016-03-07 17:45:05", updated_at: "2016-03-07 17:45:05", category_id: nil>

注意category_id：nil怎么样？它应该等于表格中指定的数字，但它不起作用。

这是Schema.rb的一个片段。它包含2个模型，类别和帖子，帖子属于某个类别。

  create_table "categories", force: :cascade do |t|
    t.string   "name"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  create_table "posts", force: :cascade do |t|
    t.string   "title"
    t.text     "description"
    t.datetime "created_at",  null: false
    t.datetime "updated_at",  null: false
    t.integer  "category_id"
  end

  add_index "posts", ["category_id"], name: "index_posts_on_category_id"

这是我的posts_controller代码

class PostsController < ApplicationController
    before_action :find_post, only: [:show, :edit, :update, :destroy]

    def index
        @posts = Post.all.order("created_at DESC")
    end

    def show
    end

    def new
        @post = Post.new
    end

    def create
        @post = Post.new(post_params)

        if @post.save
          redirect_to @post, notice: "Successfully created"
        else
          render 'new'
        end
    end

    def edit
    end

    def update
        if @post.update(post_params)
            redirect_to @post, notice: "Post was successfully updated"
        else
            render 'edit'
        end
    end

    def destroy
        @post.destroy
        redirect_to root_path
    end

    private

    def post_params
        params.require(:post).permit(:title, :description)
    end

    def find_post
        @post = Post.find(params[:id])
    end

end

Answer 1

在posts_controller.rb中，更改：

def post_params
    params.require(:post).permit(:title, :description)
end

为：

def post_params
    params.require(:post).permit(:title, :description, :category_id)
end

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1 个答案: