Bookmarking in Rails

add_remove.html.erb

# In a View
<%= render 'bookmarks/add_remove', record: @lesson %>

# The Partial
<% if current_customer && current_customer.bookmarked_content?(record) %>
  <%= button_to bookmark_path(current_customer.bookmark_for_content(record), bookmarkable_type:record.class.name, bookmarkable_id:record.id), method: :delete, class:'btn btn-sm btn-light box-shadow', form_class:'add-remove-bookmark', data:{disable_with:'Removing...'}, remote: true do %>
    <%= ms_icon('minus-circle', title:'Unsave This') %>
  <% end %>
<% else %>
  <%= button_to bookmarks_path(bookmarkable_type:record.class.name, bookmarkable_id:record.id), method: :post, class:'btn btn-sm btn-light box-shadow', form_class:'add-remove-bookmark', data:{disable_with:'Adding...'}, remote: true do %>
    <%= ms_icon('plus-circle', title:'Save This') %>
  <% end %>
<% end %>

bookmarks_controller.rb

class BookmarksController < ApplicationController

  BOOKMARKABLES = {
    'Course'      => Course,
    'Lesson'      => Lesson,
    'Post'        => Post,
    'LiveStream'  => LiveStream,
    'Download'    => Download
  }

  before_action :set_bookmark, :set_authorized_editor, only: :destroy
  before_action :find_bookmarkable, only: :create
  before_action :redirect_if_plugin_not_activated, :authenticate_customer!
	
  # POST /bookmarks
  def create
    @bookmark           = @bookmarkable.bookmarks.new
    @bookmark.user     = current_user
    @bookmark.customer = current_customer

    respond_to do |format|
	    if @bookmark.save
	    	format.html {redirect_to polymorphic_path(@bookmark.bookmarkable), success: 'Bookmark was successfully created.'}
	      format.js
	    else
	      format.html {redirect_to polymorphic_path(@bookmark.bookmarkable), danger: 'Bookmark not created.'}
	      format.js
	    end
	  end
  end

  # DELETE /bookmarks/1
  def destroy
    respond_to do |format|
      if @bookmark.destroy
        format.html {redirect_to polymorphic_path(@bookmark.bookmarkable), success: 'Bookmark was successfully destroyed.'}
        format.js
      else
        format.html {redirect_to polymorphic_path(@bookmark.bookmarkable), danger: 'Bookmark not destroyed.'}
        format.js
      end
    end
  end

  private

    def set_bookmark
      @bookmark = Bookmark.find(params[:id])
    end

	  def find_bookmarkable
	  	if params[:bookmarkable_type].present?
	    	klass = BOOKMARKABLES.fetch(params[:bookmarkable_type])
	    	@bookmarkable = klass.find(params[:bookmarkable_id])
	    end
	  end

    def set_authorized_editor
      redirect_to polymorphic_path(@bookmark.bookmarkable) unless (
        ( current_customer && (current_customer == @bookmark.customer) ) ||
        ( current_user && (current_user == @bookmark.user) ) ||
        ( current_user && current_user.can_access_site?(current_tenant) )
      )
    end

    def redirect_if_plugin_not_activated
      redirect_to site_root_path unless current_tenant.plugin_activated?('bookmarks')
    end

end

create.js.erb

$('.add-remove-bookmark').replaceWith("<%= j render partial: 'bookmarks/add_remove', locals:{record:@bookmark.bookmarkable} %>")

customer.rb

class Customer < ApplicationRecord
  
  def bookmarked_content?(content)
    bookmarks.exists?(bookmarkable:content)
  end

  def bookmark_for_content(content)
    bookmarks.find_by(bookmarkable:content)
  end
  
end

These methods are custom and not part of Rails.

ms_icon is a custom helper method that draws a single svg icon
current_customer and current_user is provide by Devise
current_tenant is provided by ActsAsTenant
plugin_activated? is a custom method that checks to see if a tenant has a plugin activated