update wiki_policy

app/controllers/wikis_controller.rb

@@ -1,7 +1,8 @@
 class WikisController < ApplicationController
   def index
-    @wikis = policy_scope(Wiki)
-    #authorize @wikis
+    # @wikis = policy_scope(Wiki)
+    @wikis = Wiki.all
+    authorize @wikis
   end
 
   def show

app/policies/application_policy.rb

@@ -11,7 +11,7 @@ def index?
   end
 
   def show?
-    scope.where(id: record.id).exists?
+    scope.where(:id => record.id).exists?
   end
 
   def create?

app/policies/wiki_policy.rb

@@ -1,9 +1,16 @@
 class WikiPolicy < ApplicationPolicy
   class Scope < Scope
+    def index?
+      true
+    end
+
+    def destroy?
+      user.present? && (record.user == user || user.admin?)
+    end
 
     def resolve
       scope
     end
-    
+
   end
 end