refactor filters

app/finders/issuable_finder.rb

@@ -19,6 +19,8 @@
 #     iids: integer[]
 #
 class IssuableFinder
+  include Gitlab::Database::CreatedAtFilter
+  
   NONE = '0'.freeze
   IRRELEVANT_PARAMS_FOR_CACHE_KEY = %i[utf8 sort page].freeze
 
@@ -438,18 +440,6 @@ class IssuableFinder
     params[:non_archived].present? ? items.non_archived : items
   end
 
-  def by_created_at(items)
-    if params[:created_after].present?
-      items = items.where(items.klass.arel_table[:created_at].gteq(params[:created_after]))
-    end
-
-    if params[:created_before].present?
-      items = items.where(items.klass.arel_table[:created_at].lteq(params[:created_before]))
-    end
-
-    items
-  end
-
   def current_user_related?
     params[:scope] == 'created-by-me' || params[:scope] == 'authored' || params[:scope] == 'assigned-to-me'
   end

app/finders/users_finder.rb

@@ -15,6 +15,8 @@
 #     skip_ldap: boolean
 #
 class UsersFinder
+  include Gitlab::Database::CreatedAtFilter
+
   attr_accessor :current_user, :params
 
   def initialize(current_user, params = {})

lib/gitlab/database/created_at_filter.rb

+module Gitlab
+  module Database
+    module CreatedAtFilter
+      def by_created_at(items)
+        if params[:created_after].present?
+          items = items.where(items.klass.arel_table[:created_at].gteq(params[:created_after]))
+        end
+
+        if params[:created_before].present?
+          items = items.where(items.klass.arel_table[:created_at].lteq(params[:created_before]))
+        end
+
+        items
+      end
+    end
+  end
+end

spec/requests/api/users_spec.rb

@@ -164,7 +164,7 @@ describe API::Users do
         expect(response).to have_http_status(400)
       end
 
-      it "returns an user created before a specific date" do
+      it "returns a user created before a specific date" do
         user = create(:user, created_at: Date.new(2000,1,1))
 
         get api("/users?created_before=2000-01-02T00:00:00.060Z", admin)