Implement update

app/controllers/exercise_collections_controller.rb

@@ -1,6 +1,7 @@
 class ExerciseCollectionsController < ApplicationController
+  include CommonBehavior
 
-  before_action :set_exercise_collection, only: [:show]
+  before_action :set_exercise_collection, only: [:show, :edit, :update]
 
   def index
     @exercise_collections = ExerciseCollection.all.paginate(:page => params[:page])
@@ -10,6 +11,12 @@ class ExerciseCollectionsController < ApplicationController
   def show
   end
 
+  def edit
+  end
+
+  def update
+    update_and_respond(object: @exercise_collection, params: exercise_collection_params)
+  end
 
   private
 
@@ -21,4 +28,8 @@ class ExerciseCollectionsController < ApplicationController
   def authorize!
     authorize(@exercise_collection || @exercise_collections)
   end
+
+  def exercise_collection_params
+    params[:exercise_collection].permit(:name, :exercise_ids)
+  end
 end

app/views/exercise_collections/_form.html.slim

@@ -0,0 +1,11 @@
+- exercises = Exercise.all
+
+= form_for(@exercise_collection, data: {exercises: exercises}, multipart: true) do |f|
+  = render('shared/form_errors', object: @exercise_collection)
+  .form-group
+    = f.label(:name)
+    = f.text_field(:name, class: 'form-control', required: true)
+  .form-group
+    = f.label(:exercises)
+    = f.collection_select(:exercise_ids, exercises, :id, :title, {}, {class: 'form-control', multiple: true})
+  .actions = render('shared/submit_button', f: f, object: @exercise_collection)

app/views/exercise_collections/edit.html.slim

@@ -0,0 +1 @@
+= render('form')