Use Gitlab::SQL::Pattern where appropriate

app/finders/notes_finder.rb

@@ -104,8 +104,7 @@ class NotesFinder
     query = @params[:search]
     return notes unless query
-    pattern = "%#{query}%"
-    notes.where(Note.arel_table[:note].matches(pattern))
+    notes.search(query)
   end
   # Notes changed since last fetch

app/models/ci/runner.rb

 module Ci
   class Runner < ActiveRecord::Base
     extend Gitlab::Ci::Model
+    include Gitlab::SQL::Pattern
     RUNNER_QUEUE_EXPIRY_TIME = 60.minutes
     ONLINE_CONTACT_TIMEOUT = 1.hour
@@ -60,7 +61,7 @@ module Ci
     # Returns an ActiveRecord::Relation.
     def self.search(query)
       t = arel_table
-      pattern = "%#{query}%"
+      pattern = to_pattern(query)
       where(t[:token].matches(pattern).or(t[:description].matches(pattern)))
     end

app/models/group.rb

@@ -50,20 +50,6 @@ class Group < Namespace
       Gitlab::Database.postgresql?
     end
-    # Searches for groups matching the given query.
-    #
-    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
-    #
-    # query - The search query as a String
-    #
-    # Returns an ActiveRecord::Relation.
-    def search(query)
-      table   = Namespace.arel_table
-      pattern = "%#{query}%"
-
-      where(table[:name].matches(pattern).or(table[:path].matches(pattern)))
-    end
-
     def sort(method)
       if method == 'storage_size_desc'
         # storage_size is a virtual column so we need to

app/models/milestone.rb

@@ -13,6 +13,7 @@ class Milestone < ActiveRecord::Base
   include Referable
   include StripAttribute
   include Milestoneish
+  include Gitlab::SQL::Pattern
   cache_markdown_field :title, pipeline: :single_line
   cache_markdown_field :description
@@ -74,7 +75,7 @@ class Milestone < ActiveRecord::Base
     # Returns an ActiveRecord::Relation.
     def search(query)
       t = arel_table
-      pattern = "%#{query}%"
+      pattern = to_pattern(query)
       where(t[:title].matches(pattern).or(t[:description].matches(pattern)))
     end

app/models/namespace.rb

@@ -9,6 +9,7 @@ class Namespace < ActiveRecord::Base
   include Routable
   include AfterCommitQueue
   include Storage::LegacyNamespace
+  include Gitlab::SQL::Pattern
   # Prevent users from creating unreasonably deep level of nesting.
   # The number 20 was taken based on maximum nesting level of
@@ -87,7 +88,7 @@ class Namespace < ActiveRecord::Base
     # Returns an ActiveRecord::Relation
     def search(query)
       t = arel_table
-      pattern = "%#{query}%"
+      pattern = to_pattern(query)
       where(t[:name].matches(pattern).or(t[:path].matches(pattern)))
     end

app/models/note.rb

@@ -14,6 +14,7 @@ class Note < ActiveRecord::Base
   include ResolvableNote
   include IgnorableColumn
   include Editable
+  include Gitlab::SQL::Pattern
   module SpecialRole
     FIRST_TIME_CONTRIBUTOR = :first_time_contributor
@@ -167,6 +168,10 @@ class Note < ActiveRecord::Base
     def has_special_role?(role, note)
       note.special_role == role
     end
+
+    def search(query)
+      where(arel_table[:note].matches(to_pattern(query)))
+    end
   end
   def cross_reference?

app/models/snippet.rb

@@ -9,6 +9,7 @@ class Snippet < ActiveRecord::Base
   include Mentionable
   include Spammable
   include Editable
+  include Gitlab::SQL::Pattern
   extend Gitlab::CurrentSettings
@@ -136,7 +137,7 @@ class Snippet < ActiveRecord::Base
     # Returns an ActiveRecord::Relation.
     def search(query)
       t = arel_table
-      pattern = "%#{query}%"
+      pattern = to_pattern(query)
       where(t[:title].matches(pattern).or(t[:file_name].matches(pattern)))
     end
@@ -149,10 +150,7 @@ class Snippet < ActiveRecord::Base
     #
     # Returns an ActiveRecord::Relation.
     def search_code(query)
-      table   = Snippet.arel_table
-      pattern = "%#{query}%"
-
-      where(table[:content].matches(pattern))
+      where(arel_table[:content].matches(to_pattern(query)))
     end
   end
 end

app/models/user.rb

@@ -339,7 +339,7 @@ class User < ActiveRecord::Base
     def search_with_secondary_emails(query)
       table = arel_table
       email_table = Email.arel_table
-      pattern = "%#{query}%"
+      pattern = to_pattern(query)
       matched_by_emails_user_ids = email_table.project(email_table[:user_id]).where(email_table[:email].matches(pattern))
       where(