Question

Groups has_ many users. I have 2 activerecord arrays: 1. groups = containing groups with its users. 2. users = containing users attending an event.

I start by iterating over the groups. Then I iterate over the users in the second array and search for that user in the first array (see code). If the user is found, show and delete from the array.

<% groups.each do |group| %>  <h2><%= group.title %></h2>    <% users.each do |user| %>      # I want to search for user in group.users      # and if present show here and remove the user from      # group.users (remove from the array not from the database)    <% end %>  <% end %>  

I don’t know how to search for a user in another active record array and then delete him. All help is greatly appreciated.

thanks

Answer 1

Directly answering your question, i.e. displaying and deleting a user of interest from all froups’ users:

<% @groups.collect { |group|      group.users.delete_if { |user|        user == my_user      }    }.flatten.each do |user| %>     <%= ((display user)) %>  <% end %> 

Alternatively,

<% @groups.each do |group| %>    <% if user = group.delete(my_user) %>      <%= ((display user)) %>    <% end %> <% end %>