discourse/app/controllers/similar_topics_controller.rb

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require_dependency 'similar_topic_serializer'
require_dependency 'search/grouped_search_results'
class SimilarTopicsController < ApplicationController
class SimilarTopic
def initialize(topic)
@topic = topic
end
attr_reader :topic
def blurb
Search::GroupedSearchResults.blurb_for(@topic.try(:blurb))
end
end
def index
params.require(:title)
params.require(:raw)
title, raw = params[:title], params[:raw]
invalid_length = [:title, :raw].any? { |key| check_invalid_length(key, params[key]) }
# Only suggest similar topics if the site has a minimum amount of topics present
# and params are long enough.
return render json: [] if invalid_length || !Topic.count_exceeds_minimum?
topics = Topic.similar_to(title, raw, current_user).to_a
topics.map! {|t| SimilarTopic.new(t) }
render_serialized(topics, SimilarTopicSerializer, root: :similar_topics, rest_serializer: true)
end
protected
def check_invalid_length(key, attr)
str = (key == :raw) ? "body" : key.to_s
attr.length < SiteSetting.send("min_#{str}_similar_length")
end
end