Refactoring Tickets

- Tickets now independent from registration
- Implemented money gem
#419

app/controllers/admin/tickets_controller.rb

@@ -0,0 +1,54 @@
+module Admin
+  class TicketsController < Admin::BaseController
+    load_and_authorize_resource :conference, find_by: :short_title
+    load_and_authorize_resource :ticket, through: :conference
+
+    def index
+      authorize! :update, Ticket.new(conference_id: @conference.id)
+    end
+
+    def new
+      @ticket = @conference.tickets.new
+    end
+
+    def create
+      @ticket = @conference.tickets.new(ticket_params)
+      if @ticket.save(ticket_params)
+        redirect_to(admin_conference_tickets_path(conference_id: @conference.short_title),
+                    notice: 'Ticket successfully created.')
+      else
+        flash[:alert] = "Creating Ticket failed: #{@ticket.errors.full_messages.join('. ')}."
+        render :new
+      end
+    end
+
+    def edit; end
+
+    def update
+      if @ticket.update_attributes(ticket_params)
+        redirect_to(admin_conference_tickets_path(conference_id: @conference.short_title),
+                    notice: 'Ticket successfully updated.')
+      else
+        flash[:alert] = "Ticket update failed: #{@ticket.errors.full_messages.join('. ')}."
+        render :edit
+      end
+    end
+
+    def destroy
+      if @ticket.destroy
+        redirect_to(admin_conference_tickets_path(conference_id: @conference.short_title),
+                    notice: 'Ticket successfully destroyed.')
+      else
+        redirect_to(admin_conference_tickets_path(conference_id: @conference.short_title),
+                    alert: "Ticket was successfully destroyed." \
+                    "#{@ticket.errors.full_messages.join('. ')}.")
+      end
+    end
+
+    private
+
+    def ticket_params
+      params[:ticket]
+    end
+  end
+end