discourse/app/serializers/basic_post_serializer.rb

# frozen_string_literal: true

# The most basic attributes of a topic that we need to create a link for it.
class BasicPostSerializer < ApplicationSerializer
  attributes :id,
             :name,
             :username,
             :avatar_template,
             :created_at,
             :cooked,
             :cooked_hidden

  attr_accessor :topic_view

  def name
    object.user && object.user.name
  end

  def username
    object.user && object.user.username
  end

  def avatar_template
    object.user && object.user.avatar_template
  end

  def cooked_hidden
    object.hidden && !scope.is_staff?
  end

  def include_cooked_hidden?
    cooked_hidden
  end

  def cooked
    if cooked_hidden
      if scope.current_user && object.user_id == scope.current_user.id
        I18n.t('flagging.you_must_edit', path: "/my/messages")
      else
        I18n.t('flagging.user_must_edit')
      end
    else
      cooked = object.filter_quotes(@parent_post)

      if scope&.user

        # PERF: this should not run on every post, only specific ones
        # also, why is this in basic post serializer?
        requested_group_id = post_custom_fields['requested_group_id'].to_i

        if requested_group_id > 0
          group = Group
            .joins('JOIN group_users ON groups.id = group_users.group_id')
            .find_by(
              id: object.custom_fields['requested_group_id'].to_i,
              group_users: { user_id: scope.user.id, owner: true }
            )

          if group
            cooked << <<~EOF
              <hr />
              <a href="#{Discourse.base_uri}/g/#{group.name}/requests">
                #{I18n.t('groups.request_membership_pm.handle')}
              </a>
            EOF
          end
        end
      end

      cooked
    end
  end

  def include_name?
    SiteSetting.enable_names?
  end

  def post_custom_fields
    @post_custom_fields ||= if @topic_view
      (@topic_view.post_custom_fields || {})[object.id] || {}
    else
      object.custom_fields
    end
  end

end