Question

想在网络浏览器的学校内创建一名教师。不确定我需要做什么代码。使用脚手架创建学校和控制器和模型来创建教师。我的目标是在创建学校后能够添加教师。

学校模式

    class School < ActiveRecord::Base
    has_many :teachers
end

教师模型

    class Teacher < ActiveRecord::Base
  belongs_to :school
end

学校管理员

    class SchoolsController < ApplicationController
  before_action :set_school, only: [:show, :edit, :update, :destroy]

  # GET /schools
  # GET /schools.json
  def index
    @schools = School.all
  end

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

  # GET /schools/new
  def new
    @school = School.new
  end

  # GET /schools/1/edit
  def edit
  end

  # POST /schools
  # POST /schools.json
  def create
    @school = School.new(school_params)

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

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

  # DELETE /schools/1
  # DELETE /schools/1.json
  def destroy
    @school.destroy
    respond_to do |format|
      format.html { redirect_to schools_url, notice: 'School was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def school_params
      params.require(:school).permit(:name)
    end
end

教师控制器

    class TeachersController < ApplicationController
end

学校/视图/显示

    <p id="notice"><%= notice %></p>

<p>
  <strong>Name:</strong>
  <%= @school.name %>
</p>

<%= link_to 'Edit', edit_school_path(@school) %> |
<%= link_to 'Back', schools_path %>

Answer 1

您可以在您的学校或教师控制器中执行此操作，您可能需要创建，绝对更新。假设学校控制员和那个参数包括教师姓名：teacher_name。

def update
  @school.teachers = Teacher.new(school_params[:teacher_name])

  respond_to do |format|
    ... snip for brevity ...
  end
end

我假设您的数据库表已经使用[迁移]设置。1

Answer 2

从教师那边：

在教师新页面（您的表单）中，您需要有一个教师可以拥有的学校的选择框，这些学校将其ID作为值（来自数据库）。教师模型将school_id作为其属性之一，一旦你进入rails控制台并键入类似School.first.teachers的内容，你将获得该学校所有教师的列表。

无法创建我的第一个关联对象：学校的老师

2 个答案: