Fix 500 error on group members search

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/groups_controller.rb

@@ -68,7 +68,7 @@ class GroupsController < ApplicationController
     @members = group.users_groups
 
     if params[:search].present?
-      users = group.users.search(params[:search])
+      users = group.users.search(params[:search]).to_a
       @members = @members.where(user_id: users)
     end
 

features/group.feature

@@ -113,3 +113,10 @@ Feature: Groups
     Then I should see user "John Doe" in team list
     Then I should see user "Mary Jane" in team list
     Then I should not see the "Remove User From Group" button for "Mary Jane"
+
+  Scenario: Search member by name
+    Given "Mary Jane" is guest of group "Guest"
+    And I visit group "Guest" members page
+    When I search for 'Mary' member
+    Then I should see user "Mary Jane" in team list
+    Then I should not see user "John Doe" in team list

features/steps/group/group.rb

@@ -157,6 +157,13 @@ class Groups < Spinach::FeatureSteps
     # poltergeist always confirms popups.
   end
 
+  step 'I search for \'Mary\' member' do
+    within '.member-search-form' do
+      fill_in 'search', with: 'Mary'
+      click_button 'Search'
+    end
+  end
+
   protected
 
   def assigned_to_me key