Question

我在从下拉列表中保存数据时遇到问题下面我有表格上的字段和随附的日志

此设置正常工作，您可以通过日志插入

看到

<div class="field">
    <%= f.label :company_id %><br>
    <%= f.number_field :company_id %>
  </div>

日志文件

INSERT INTO "learners"
 ("learner_id",  "company_id", "id_type", "id_number", "first_name", "last_name", "middle_names", "title", "equity", "gender", "date_of_birth", "created_at", "updated_at") 
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)  
[["learner_id", 1], ["company_id", 1], ["id_type", "Book"], ["id_number", 33], ["first_name", "Jack"], ["last_name", "Pillay"], ["middle_names", ""], ["title", "Mr"],
 ["equity", "Black"], ["gender", "Male"], ["date_of_birth", "2016-06-28"], 
["created_at", "2016-06-28 19:16:41.969037"], ["updated_at", "2016-06-28 19:16:41.969037"]]

Dropdown有效，但没有传递任何值

<div class="field">
    <%= f.label :company_id %><br>
    <%= collection_select(:learner, :learner_id, Client.all, :company_id, :name, prompt: true) %> 
  </div>

日志文件 - 查看缺少的company_id

INSERT INTO "learners"
 ("learner_id", "id_type", "id_number", "first_name", "last_name", "middle_names", "title", "equity", "gender", "date_of_birth", "created_at", "updated_at") 
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)  
[["learner_id", 1], ["id_type", "Book"], ["id_number", 33], ["first_name", "Jack"], ["last_name", "Pillay"], ["middle_names", ""], ["title", "Mr"],
 ["equity", "Black"], ["gender", "Male"], ["date_of_birth", "2016-06-28"], 
["created_at", "2016-06-28 19:16:41.969037"], ["updated_at", "2016-06-28 19:16:41.969037"]]

学习者控制器

class LearnersController < ApplicationController
  before_action :set_learner, only: [:show, :edit, :update, :destroy]

  # GET /learners
  # GET /learners.json
  def index
    @learners = Learner.all
  end

  # GET /learners/1
  # GET /learners/1.json
  def show
  end

  # GET /learners/new
  def new
    @learner = Learner.new
    @clients = Client.all
    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @learner }
    end
  end

  # GET /learners/1/edit
  def edit
  end

  # POST /learners
  # POST /learners.json
  def create
    @learner = Learner.new(learner_params)

    respond_to do |format|
      if @learner.save
        format.html { redirect_to @learner, notice: 'Learner was successfully created.' }
        format.json { render :show, status: :created, location: @learner }
      else
        format.html { render :new }
        format.json { render json: @learner.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /learners/1
  # PATCH/PUT /learners/1.json
  def update
    respond_to do |format|
      if @learner.update(learner_params)
        format.html { redirect_to @learner, notice: 'Learner was successfully updated.' }
        format.json { render :show, status: :ok, location: @learner }
      else
        format.html { render :edit }
        format.json { render json: @learner.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /learners/1
  # DELETE /learners/1.json
  def destroy
    @learner.destroy
    respond_to do |format|
      format.html { redirect_to learners_url, notice: 'Learner was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_learner
      @learner = Learner.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def learner_params
      params.require(:learner).permit(:learner_id, :company_id, :id_type, :id_number, :date_of_birth, :first_name, :last_name, :middle_names, :title, :equity, :gender)
    end
end

Answer 1

这一行

<%= collection_select(:learner, :learner_id, Client.all, :company_id, :name, prompt: true) %>

告诉Rails将选定的值发送到params[:learner][:learner_id]中的服务器。如果要将该值用作client_id，则应将该行更改为：

<%= collection_select(:learner, :company_id, Client.all, :company_id, :name, prompt: true) %>

或者使用稍短的FormBuilder版本：

<%= f.collection_select(:company_id, Client.all, :company_id, :name, prompt: true) %>

Collection_select没有将值传递给insert

1 个答案: