Class: TopicThumbnail

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
app/models/topic_thumbnail.rb

Overview

This model indicates an ‘attempt’ to create a topic thumbnail for an upload. This means we don’t keep trying to create optimized images for small/invalid original images.

Foreign keys with ON DELETE CASCADE are used to ensure unneeded data is deleted automatically

Class Method Summary collapse

Class Method Details

.ensure_consistency! ⇒ Object 



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# File 'app/models/topic_thumbnail.rb', line 43

def self.ensure_consistency!
  # Clean up records for broken upload links or broken optimized image links
  TopicThumbnail
    .joins("LEFT JOIN uploads on upload_id = uploads.id")
    .joins("LEFT JOIN optimized_images on optimized_image_id = optimized_images.id")
    .where(<<~SQL)
      (optimized_image_id IS NOT NULL AND optimized_images IS NULL)
      OR uploads IS NULL
    SQL
    .delete_all

  # Delete records for sizes which are no longer needed
  sizes =
    Topic.thumbnail_sizes +
      ThemeModifierHelper.new(theme_ids: Theme.pluck(:id)).topic_thumbnail_sizes
  sizes_sql =
    sizes.map { |s| "(max_width = #{s[0].to_i} AND max_height = #{s[1].to_i})" }.join(" OR ")
  TopicThumbnail.where.not(sizes_sql).delete_all
end

.find_or_create_for!(original, max_width:, max_height:) ⇒ Object 



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# File 'app/models/topic_thumbnail.rb', line 13

def self.find_or_create_for!(original, max_width:, max_height:)
  existing =
    TopicThumbnail.find_by(upload: original, max_width: max_width, max_height: max_height)
  return existing if existing
  return nil if !SiteSetting.create_thumbnails?

  target_width, target_height =
    ImageSizer.resize(
      original.width,
      original.height,
      { max_width: max_width, max_height: max_height },
    )

  if target_width < original.width && target_height < original.height
    optimized = OptimizedImage.create_for(original, target_width, target_height)
  end

  # may have been associated already, bulk insert will skip dupes
  TopicThumbnail.insert_all(
    [
      upload_id: original.id,
      max_width: max_width,
      max_height: max_height,
      optimized_image_id: optimized&.id,
    ],
  )

  TopicThumbnail.find_by(upload: original, max_width: max_width, max_height: max_height)
end