Ruby: Rails controller actions

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Controllers serve as the intermediary between models and views by receiving incoming requests and rendering the appropriate responses. The following examples illustrate common controller actions for listing, showing, creating, updating, and deleting resources:

1. Index action (list all objects):

   def index
     @objects = ModelName.all
   end
   

2. Show action (display a single object):

   def show
     @object = ModelName.find(params[:id])
   end
   

3. New action (display form for a new object):

   def new
     @object = ModelName.new
   end
   

4. Create action (save a new object):

   def create
     @object = ModelName.new(params.require(:model_name).permit(:field1, :field2))
     if @object.save
       redirect_to @object
     else
       render :new
     end
   end
   

5. Edit action (display form for editing an existing object):

   def edit
     @object = ModelName.find(params[:id])
   end
   

6. Update action (apply changes to an existing object):

   def update
     @object = ModelName.find(params[:id])
     if @object.update(params.require(:model_name).permit(:field1, :field2))
       redirect_to @object
     else
       render :edit
     end
   end
   

7. Destroy action (delete an object):

   def destroy
     @object = ModelName.find(params[:id])
     @object.destroy
     redirect_to model_name_path
   end