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73 lines
2.5 KiB
Ruby
73 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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# This model indicates an 'attempt' to create a topic thumbnail
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# for an upload. This means we don't keep trying to create optimized
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# images for small/invalid original images.
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#
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# Foreign keys with ON DELETE CASCADE are used to ensure unneeded data
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# is deleted automatically
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class TopicThumbnail < ActiveRecord::Base
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belongs_to :upload
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belongs_to :optimized_image
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def self.find_or_create_for!(original, max_width: , max_height:)
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existing = TopicThumbnail.find_by(upload: original, max_width: max_width, max_height: max_height)
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return existing if existing
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return nil if !SiteSetting.create_thumbnails?
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target_width, target_height = ImageSizer.resize(original.width, original.height, { max_width: max_width, max_height: max_height })
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if target_width < original.width && target_height < original.height
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optimized = OptimizedImage.create_for(original, target_width, target_height)
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end
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# may have been associated already, bulk insert will skip dupes
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TopicThumbnail.insert_all([
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upload_id: original.id,
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max_width: max_width,
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max_height: max_height,
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optimized_image_id: optimized&.id
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])
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TopicThumbnail.find_by(
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upload: original,
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max_width: max_width,
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max_height: max_height
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)
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end
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def self.ensure_consistency!
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# Clean up records for broken upload links or broken optimized image links
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TopicThumbnail
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.joins("LEFT JOIN uploads on upload_id = uploads.id")
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.joins("LEFT JOIN optimized_images on optimized_image_id = optimized_images.id")
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.where(<<~SQL)
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(optimized_image_id IS NOT NULL AND optimized_images IS NULL)
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OR uploads IS NULL
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SQL
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.delete_all
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# Delete records for sizes which are no longer needed
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sizes = Topic.thumbnail_sizes + ThemeModifierHelper.new(theme_ids: Theme.pluck(:id)).topic_thumbnail_sizes
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sizes_sql = sizes.map { |s| "(max_width = #{s[0].to_i} AND max_height = #{s[1].to_i})" }.join(" OR ")
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TopicThumbnail.where.not(sizes_sql).delete_all
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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: topic_thumbnails
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#
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# id :bigint not null, primary key
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# upload_id :bigint not null
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# optimized_image_id :bigint
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# max_width :integer not null
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# max_height :integer not null
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#
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# Indexes
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#
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# index_topic_thumbnails_on_optimized_image_id (optimized_image_id)
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# index_topic_thumbnails_on_upload_id (upload_id)
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# unique_topic_thumbnails (upload_id,max_width,max_height) UNIQUE
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#
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