[phase-4]add delete operation

app/controllers/glossary_terms_controller.rb

@@ -1,6 +1,6 @@
 class GlossaryTermsController < ApplicationController
 
-  before_action :find_term_from_id, only: [:show, :edit, :update]
+  before_action :find_term_from_id, only: [:show, :edit, :update, :destroy]
   
   def index
     @glossary_terms = GlossaryTerm.all
@@ -31,6 +31,11 @@ class GlossaryTermsController < ApplicationController
     flash.now[:error] = l(:notice_locking_conflict)
   end
 
+  def destroy
+    @term.destroy
+    redirect_to glossary_terms_path
+  end
+  
   # Find the term whose id is the :id parameter
   def find_term_from_id
     @term = GlossaryTerm.find(params[:id])

app/views/glossary_terms/show.html.erb

@@ -1,5 +1,7 @@
 <div class="contextual">
   <%= link_to l(:button_edit), edit_glossary_term_path, class: 'icon icon-edit' %>
+  <%= link_to l(:button_delete), glossary_term_path, method: :delete,
+  data: {confirm: l(:text_are_you_sure)}, class: 'icon icon-del' %>
 </div>
 
 <h2><%=l :label_glossary_term %> #<%= @term.id %></h2>