What happens when you generate a scaffold in Rails 5 ?

Q. What happens when you rails g scaffold Employee eno:string ename:string dept:string date_join:date active:boolean ?

ANSWER

1. Migration file created as yyyymmddhhmmss_create_employees.rb

CreateEmployees < ActiveRecord::Migration[ 5.0]

  def change    
    create_table :employees do |t|
      t.string :eno      
      t.string :ename      
      t.string :dept      
      t.date :date_join      
      t.boolean :active
      t.timestamps
    end  
  end
end

2. Employee Model created as employee.rb

class Employee < ApplicationRecord
end

3. Employees Controller created as employees_controller.rb

class EmployeesController < ApplicationController  
  before_action :set_employee, only: [:show, :edit, :update, :destroy]

  # GET /employees  # GET /employees.json  
  def index    
   @employees = Employee.all
  end

  # GET /employees/1  # GET /employees/1.json  
  def show  
  end
 
  # GET /employees/new    
  def new    
     @employee = Employee.new
  end

  # GET /employees/1/edit  
  def edit  
  end
  
  # POST /employees  # POST /employees.json  
  def create    
   @employee = Employee.new(employee_params)
    respond_to do |format|
      if @employee.save
        format.html { redirect_to @employee, notice: 'Employee was successfully created.' }
        format.json { render :show, status: :created, location: @employee }
      else        
        format.html { render :new }
        format.json { render json: @employee.errors, status: :unprocessable_entity }
      end    end  end

  # PATCH/PUT /employees/1  # PATCH/PUT /employees/1.json  
   def update    
      respond_to do |format|
      if @employee.update(employee_params)
        format.html { redirect_to @employee, notice: 'Employee was successfully updated.' }
        format.json { render :show, status: :ok, location: @employee }
      else        
        format.html { render :edit }
        format.json { render json: @employee.errors, status: :unprocessable_entity }
      end    end  end
  
 # DELETE /employees/1  # DELETE /employees/1.json  
   def destroy    @employee.destroy
    respond_to do |format|
      format.html { redirect_to employees_url, notice: 'Employee was successfully destroyed.' }
      format.json { head :no_content }
    end  
  end
  
 private    
   # Use callbacks to share common setup or constraints between actions.    
   def set_employee      
     @employee = Employee.find(params[:id])
    end
   
   # Never trust parameters from the scary internet, only allow the white list through.    
   def employee_params      
     params.require(:employee).permit(:eno, :ename, :dept, :date_join, :active)
   end
  end


4. Views created under Views/employees folder

_form.html.erb, edit.html.erb, new.html.erb and show.html.erb automatically created










5. Tests folder

Test files for controllers employees_controller_tests.rb
Test files for models employees_tests.rb
Test files for fixtures employees.yml




6. Routes: resources:employees