111 lines
2.9 KiB
Ruby
111 lines
2.9 KiB
Ruby
class Photo < ActiveRecord::Base
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attr_accessor :file
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validates_presence_of :author_id, :album_id
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belongs_to :album
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belongs_to :author
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has_many :photo_tags, :dependent => :destroy
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has_many :tags, :through => :photo_tags
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before_validation_on_create :set_author_id
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before_create :validate_image_sanity
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after_create :create_directories
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before_destroy :destroy_directories
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attr_protected :author_id
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##
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# Determines the base directory for all files in this model.
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#
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def base_directory
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"#{Merb.root}/public/photos/#{id}"
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end
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##
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# Checks to see if the file is found on the filesystem.
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#
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def exist?
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File.exist?(self.pathname)
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end
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##
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# Returns the full path to the file on the filesystem.
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#
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def pathname
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"#{self.base_directory}/#{self.filename}"
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end
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def self.popular_tags(limit = nil)
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query = "SELECT tags.id, tags.name, count(*) AS count FROM photo_tags, tags, photos WHERE tags.id = tag_id AND photo_tags.photo_id = photos.id GROUP BY tags.id, tags.name ORDER BY tags.name ASC"
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query << " LIMIT #{limit}" unless limit.nil?
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Tag.find_by_sql(query)
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end
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protected
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##
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# Sets the Author marker for ownership on creation.
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#
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def set_author_id
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self.author_id ||= Application.current_author_id
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end
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##
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# Checks to make sure that the file exists and is an image.
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#
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def validate_image_sanity
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if self.file[:tempfile].nil?
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self.errors.add(:file, 'File is not a file')
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end
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if self.file[:content_type] !~ /image\/\w+/
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self.errors.add(:file, 'File is not a supported type')
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end
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if self.file[:size] > 3 * 1048576
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self.errors.add(:file, 'File is too big (3MB max)')
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end
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return false unless self.errors.empty?
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begin
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@fstr = self.file[:tempfile].read
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iary = Magick::Image.from_blob(@fstr)
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self.filename = File.basename(self.file[:filename]).gsub(/[^\w._-]/, '')
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if iary.first.to_s =~ / (\d+)x(\d+) /
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self.width = $1
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self.height = $2
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end
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rescue
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$stderr.puts("Caught an exception saving an image:")
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$stderr.puts("* #{$!}")
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self.errors.add(:file, 'File could not be read as an image')
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return false
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end
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self.content_type = self.file[:content_type]
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true
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end
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##
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# Makes the directories and writes the file to disk.
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#
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def create_directories
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File.umask(0022)
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Dir.mkdir(base_directory) unless File.exist?(base_directory)
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File.open("#{base_directory}/#{self.filename}", "w") do |f|
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f.puts(@fstr)
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end
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File.chmod(0644, "#{base_directory}/#{self.filename}")
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end
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##
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# Removes the directories and files associated with this model on destroy.
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#
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def destroy_directories
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return unless File.exists?(base_directory)
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Dir.foreach(base_directory) do |file|
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next if file =~ /^\.\.?$/
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File.delete(base_directory + '/' + file)
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end
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Dir.delete(base_directory)
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end
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end |