【Ruby on Rails CRUD作成】Partialとテストコード実装

<%= render partial: "form", locals: {action: 'new'} %>

<%= form_with(model: @aim, local: true) do |f| %>
  <%= render "shared/error_messages", model: @aim %>
  <div class="form-group mb-3">
    <%= f.label :title, '目標名', class: 'form-label background-color' %>
    <%= f.text_field :title, class: 'form-control', readonly: action==='show' %>
  </div>

  <div class="form-group mb-3">
    <%= f.label :reason, '理由', class: 'form-label background-color' %>
    <%= f.text_area :reason, class: 'form-control', readonly: action==='show' %>
  </div>

  <div class="form-group mb-3">
    <%= f.label :advantage, '得られるもの', class: 'form-label background-color' %>
    <%= f.text_area :advantage, class: 'form-control', readonly: action==='show' %>
  </div>

  <div class="form-group mb-3">
    <%= f.label :difficulty, '難易度', class: 'form-label background-color' %>
    <%= f.text_field :difficulty, class: 'form-control', readonly: action==='show' %>
  </div>

  <div class="form-group mb-3">
    <% if action==='show' %>
      <%= link_to '編集', edit_aim_path(@aim.id), class: 'btn btn-primary' %>
    <% else %>
      <%= f.submit "#{ @aim.new_record? ? '新規作成' : '更新' }", class: 'mt-3 btn btn-primary' %>
    <% end %>
  </div>
<% end %>

<%= form_with(model: @aim, local: true) do |f| %>

  <%= f.label :title, '目標名', class: 'form-label background-color' %>
  <%= f.text_field :title, class: 'form-control', readonly: action==='show' %>

require 'rails_helper'

RSpec.describe 'Aims', type: :request do
  let!(:aim1) { create(:aim) }
  let(:aim_params) { { title: 'aim1', reason: 'test', advantage: 'test2' } }

  describe 'GET /new' do
    it 'returns http success' do
      get "/aims/new"
      expect(response).to have_http_status(:success)
    end
  end

  describe 'GET /edit' do
    it 'returns http success' do
      get "/aims/#{aim1.id}/edit
      expect(response).to have_http_status(:success)
    end
  end

  describe 'POST /create' do
    it 'returns http success' do
      post "/aims", params: { aim: aim_params }
      expect(response).to have_http_status(302)
    end

    context '正常系' do
      it 'レコードの数が一つ増える' do
        expect do
          post "/aims", params: { aim: aim_params }
        end.to change { Aim.count }.by(1)
      end

      it '一覧画面にリダイレクトされる' do
        post "/aims", params: { aim: aim_params }
        expect(response).to redirect_to(aims_path)
      end
    end

    context '異常系' do
      before do
        aim_params[:title] = ''
      end

      it 'レコードの数が増えない' do
        expect do
          post "/aims", params: { aim: aim_params }
        end.to change { Aim.count }.by(0)
      end

      it '新規作成画面にレンダリングされる' do
        post "/aims", params: { aim: aim_params }
        expect(response).to render_template :new
      end
    end
  end

  describe 'PATCH /update' do
    it 'returns http success' do
      patch "/aims/#{aim1.id}", params: { aim: aim_params }
      expect(response).to have_http_status(302)
    end

    context '正常系' do
      it 'レコードの値が変更されている' do
        patch "/aims/#{aim1.id}", params: { aim: aim_params }
        expect(aim1.reload[:title]).to eq 'aim1'
      end

      it '一覧画面にリダイレクトされる' do
        patch "/aims/#{aim1.id}", params: { aim: aim_params }
        expect(response).to redirect_to(aim_path(aim1.id))
      end
    end

    context '異常系' do
      before do
        aim_params[:title] = ''
      end

      it 'レコードの値が変更されていない' do
        patch "/aims/#{aim1.id}", params: { aim: aim_params }
        expect(aim1.reload[:title]).to eq 'Golang取得'
      end

      it '新規作成画面にレンダリングされる' do
        patch "/aims/#{aim1.id}", params: { aim: aim_params }
        expect(response).to render_template :edit
      end
    end
  end
end

class AimsController < ApplicationController
  before_action :set_aim, only: [:show, :edit, :update]

  def index
    @q = Aim.ransack(params[:q])
    @aims = @q.result.page(params[:page]).per(5)
  end

  def show
  end

  def new
    @aim = Aim.new
  end

  def create
    @aim = Aim.new(aim_params)
    if @aim.save
      flash[:success] = '目標を作成しました'
      redirect_to aims_path
    else
      render 'new', status: :unprocessable_entity
    end
  end

  def edit
  end

  def update
    if @aim.update(aim_params)
      flash[:success] = '目標を更新しました'
      redirect_to aim_path(@aim.id)
    else
      render 'edit', status: :unprocessable_entity
    end
  end

  private
    def set_aim
      @aim = Aim.find(params[:id])
    end

    def aim_params
      params.require(:aim).permit(:title, :reason, :advantage, :difficulty)
    end
end

 def aim_params
   params.require(:aim).permit(:title, :reason, :advantage, :difficulty)
 end