discourse/lib/suggested_topics_builder.rb

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require_dependency 'topic_list'
class SuggestedTopicsBuilder
attr_reader :excluded_topic_ids
def initialize(topic)
@excluded_topic_ids = [topic.id]
@category_id = topic.category_id
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@category_topic_ids = Category.topic_ids
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@results = []
end
def add_results(results, priority=:low)
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# WARNING .blank? will execute an Active Record query
return unless results
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# Only add results if we don't have those topic ids already
results = results.where('topics.id NOT IN (?)', @excluded_topic_ids)
.where(visible: true)
# If limit suggested to category is enabled, restrict to that category
if @category_id && SiteSetting.limit_suggested_to_category?
results = results.where(category_id: @category_id)
end
results = results.to_a.reject { |topic| @category_topic_ids.include?(topic.id) }
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unless results.empty?
# Keep track of the ids we've added
@excluded_topic_ids.concat results.map {|r| r.id}
splice_results(results,priority)
end
end
def splice_results(results, priority)
if @category_id && priority == :high
# Topics from category @category_id need to be first in the list, all others after.
other_category_index = @results.index { |r| r.category_id != @category_id }
category_results, other_category_results = results.partition{ |r| r.category_id == @category_id }
if other_category_index
@results.insert other_category_index, *category_results
else
@results.concat category_results
end
@results.concat other_category_results
else
@results.concat results
end
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end
def results
@results.first(SiteSetting.suggested_topics)
end
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def results_left
SiteSetting.suggested_topics - @results.size
end
def full?
results_left <= 0
end
def category_results_left
SiteSetting.suggested_topics - @results.count{|r| r.category_id == @category_id}
end
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def size
@results.size
end
end