add validations for boolean attributes

app/models/project.rb

@@ -104,6 +104,8 @@ class Project < ActiveRecord::Base
             length: { within: 1..255 }
 
   validates :owner, presence: true
+  validates :issues_enabled, :wall_enabled, :merge_requests_enabled,
+            :wiki_enabled, inclusion: { in: [true, false] }
   validate :check_limit
   validate :repo_name
 

app/roles/issue_commonality.rb

@@ -16,7 +16,7 @@ module IssueCommonality
     validates :title,
               presence: true,
               length: { within: 0..255 }
-
+    validates :closed, inclusion: { in: [true, false] }
 
     scope :opened, where(closed: false)
     scope :closed, where(closed: true)