app/finders/groups_finder.rb


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class GroupsFinder
  def execute(current_user, options = {})
    all_groups(current_user)
  end

  private

  def all_groups(current_user)
    if current_user
      if current_user.authorized_groups.any?
        # User has access to groups
        #
        # Return only:
        #   groups with public projects
        #   groups with internal projects
        #   groups with joined projects
        #
        group_ids = Project.public_and_internal_only.pluck(:namespace_id) +
          current_user.authorized_groups.pluck(:id)
        Group.where(id: group_ids)
      else
        # User has no group membership
        #
        # Return only:
        #   groups with public projects
        #   groups with internal projects
        #
        Group.where(id: Project.public_and_internal_only.pluck(:namespace_id))
      end
    else
      # Not authenticated
      #
      # Return only:
      #   groups with public projects
      Group.where(id: Project.public_only.pluck(:namespace_id))
    end
  end
end