63 lines
1.6 KiB
Ruby
63 lines
1.6 KiB
Ruby
class CategoryFeaturedUser < ActiveRecord::Base
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belongs_to :category
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belongs_to :user
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def self.max_featured_users
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5
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end
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def self.feature_users_in(category_or_category_id)
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category_id =
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if category_or_category_id.is_a?(Fixnum)
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category_or_category_id
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else
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category_or_category_id.id
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end
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# Figure out most recent posters in the category
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most_recent_user_ids = exec_sql "
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SELECT x.user_id
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FROM (
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SELECT DISTINCT ON (p.user_id) p.user_id AS user_id,
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p.created_at AS created_at
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FROM posts AS p
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INNER JOIN topics AS ft ON ft.id = p.topic_id
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WHERE ft.category_id = :category_id
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AND p.user_id IS NOT NULL
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ORDER BY p.user_id, p.created_at DESC
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) AS x
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ORDER BY x.created_at DESC
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LIMIT :max_featured_users;
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", category_id: category_id, max_featured_users: max_featured_users
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user_ids = most_recent_user_ids.map{|uc| uc['user_id'].to_i}
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current = CategoryFeaturedUser.where(category_id: category_id).order(:id).pluck(:user_id)
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return if current == user_ids
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transaction do
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CategoryFeaturedUser.delete_all category_id: category_id
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user_ids.each do |user_id|
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create(category_id: category_id, user_id: user_id)
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end
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end
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end
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end
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# == Schema Information
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#
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# Table name: category_featured_users
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#
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# id :integer not null, primary key
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# category_id :integer
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# user_id :integer
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# created_at :datetime not null
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# updated_at :datetime not null
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#
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# Indexes
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#
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# index_category_featured_users_on_category_id_and_user_id (category_id,user_id) UNIQUE
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#
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