The patter for rails controller

controller.rb

 # READ - GET 
    # Page will see and interact with
    # shows record from the db onto the pages

    # index action - see all of the record for the table
       @model_names = Model_name.all
      # gets all the records and set them to a variable

    # show action - see a single record, id 
       @model_name = Model_name.find(params[:id])

    # new action - display the new record form, creates the 
    # record in memory
       @model_name = Model_name.new

    # edit action - displays the edit record form, id
       @model_name = Model_name.find(params[:id])

  # Create / POST 
    # - create action create a record, from the new action 
     @model_name = Model_name.new(model_name_params)

     if @model_name.save
       do something
     else
       render :new
     end

  # UPDATE / PUT PATCH
    # - update action, edit a record, edit form , id 

       @model_name = Model_name.find(params[:id])
       if @model_name.update(model_name_params)
         do something
       else
         render :edit
       end

  # Destroy / DELETE
    # - destroy action delete a record, id 
    
     Model_name.find(params[:id]).destroy
     do something

# model_name_params
    # - pass certain attr 

   private 
    def model_name_params
       params.require(:model_name).permit(:attr, :everything :that :table :has)
     end