discourse/app/serializers/topic_list_item_serializer.rb

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class TopicListItemSerializer < ListableTopicSerializer
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attributes :views,
:like_count,
:starred,
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:has_summary,
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:archetype,
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:last_poster_username,
:category_id
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has_many :posters, serializer: TopicPosterSerializer, embed: :objects
def starred
object.user_data.starred?
end
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alias :include_starred? :has_user_data
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def posters
object.posters || []
end
def last_poster_username
object.posters.find { |poster| poster.user.id == object.last_post_user_id }.try(:user).try(:username)
end
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end