photomix/app/models/photo.rb

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Ruby
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require "image_science"
require 'mini_exiftool'
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class Photo < ActiveRecord::Base
belongs_to :album
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has_many :photo_tags, :dependent => :destroy
has_many :tags, :through => :photo_tags
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validates_uniqueness_of :path, :message => "Photo already exsists on disc"
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validates_presence_of :title
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before_validation :set_title
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before_save :ensure_file
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before_create :exif_read
after_create :create_thumbnails
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#before_update :exif_write # should only write if tags are changed as images can be large and thus ExifTool will take a while to write to the file
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before_destroy :destroy_file
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attr_accessor :tag_list
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#attr_protected :path
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named_scope :untouched, :conditions => "Photos.description IS NULL AND Photos.Id NOT IN ( SELECT Photo_ID FROM Photo_Tags)", :include => :album
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named_scope :previous, lambda { |p,a| { :conditions => ["id < :id AND Album_Id = :album ", { :id => p, :album => a } ], :limit => 1, :order => "Id DESC"} }
named_scope :next, lambda { |p,a| { :conditions => ["id > :id AND Album_Id = :album ", { :id => p, :album => a } ], :limit => 1, :order => "Id ASC"} }
def to_param
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self.id.to_s + '-' + self.title.parameterize
end
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def path_original_public
return APP_CONFIG[:photos_path_public] + self.path
end
def path_modified_public(size)
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return APP_CONFIG[:thumbs_path_public] + self.album.path + "/" + self.id.to_s + "_" + size + self.extension
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end
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def tag(title)
return if self.tags.collect{|tag|tag.title}.include?( title )
self.photo_tags.create(:tag => Tag.find_or_create_by_title( :title => title) )
self.reload
end
def untag(title)
return if !self.tags.collect{|tag|tag.title}.include?( title )
# perhaps not the best way but it finds the correct PhotoTag and deletes it
self.photo_tags.select{|photo_tag|
photo_tag.tag.title == title
}.each {|photo_tag|photo_tag.destroy}
self.reload
end
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def tag_list
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return self.tags.find(:all, :order => 'title').map{ |t| t.title }.sort.join(" ")
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end
def tag_list=(tags)
ts = Array.new
tags.split(" ").each do |tag|
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ts.push( Tag.find_or_create_by_title( :title => tag.downcase) )
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end
self.tags = ts
end
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def exif_info
photo = MiniExiftool.new(self.path_original)
photo.tags.sort.each do |tag|
puts tag.ljust(28) + photo[tag].to_s
end
end
# Map file extensions to mime types.
# Thanks to bug in Flash 8 the content type is always set to application/octet-stream.
# From: http://blog.airbladesoftware.com/2007/8/8/uploading-files-with-swfupload
def swf_uploaded_data=(data)
data.content_type = MIME::Types.type_for(data.original_filename)
self.title = data.original_filename
self.path = self.album.path + "/" + data.original_filename
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File.open(APP_CONFIG[:photos_path] + self.path, 'wb') { |f| f.write(data.read) }
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end
def create_thumbnails
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ImageScience.with_image(self.path_original) do |img|
img.cropped_thumbnail(200) do |thumb|
thumb.save APP_CONFIG[:thumbs_path] + self.album.path + "/" + self.id.to_s + "_collection" + self.extension
end
img.cropped_thumbnail(100) do |thumb|
thumb.save APP_CONFIG[:thumbs_path] + self.album.path + "/" + self.id.to_s + "_album" + self.extension
end
img.thumbnail(210) do |thumb|
thumb.save APP_CONFIG[:thumbs_path] + self.album.path + "/" + self.id.to_s + "_preview" + self.extension
end
img.thumbnail(800) do |thumb|
thumb.save APP_CONFIG[:thumbs_path] + self.album.path + "/" + self.id.to_s + "_single" + self.extension
end
end
end
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protected
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def extension
return File.extname(self.path_original)
end
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def path_original
return APP_CONFIG[:photos_path] + self.path
end
def path_modified(size)
return APP_CONFIG[:thumbs_path] + self.album.path + "/" + self.id.to_s + "_" + size + self.extension
end
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private
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def set_title
self.title = File.basename( self.path ).gsub( self.extension, "" ) unless self.title
end
def ensure_file
self.destroy if !File.exists?( APP_CONFIG[:photos_path] + self.path )
end
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def exif_read
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photo = MiniExiftool.new(self.path_original)
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self.longitude = photo.GPSLongitude if self.longitude.nil?
self.latitude = photo.GPSLatitude if self.latitude.nil?
self.title = photo.DocumentName if self.title.nil?
self.description = photo.ImageDescription if self.description.nil? || photo.ImageDescription != 'Exif_JPEG_PICTURE'
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self.tag_list = (self.tags.empty? ? "" : self.album.tag_list) + " " + (photo.Keywords.nil? ? "" : photo.Keywords.to_a.map { |tag| tag.gsub(" ", "_") }.join(" "))
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end
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def exif_write
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photo = MiniExiftool.new(self.path_original)
photo.GPSLongitude = self.longitude
photo.GPSLatitude = self.latitude
photo.DocumentName = self.title
photo.ImageDescription = self.description
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photo.Keywords = self.tags
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photo.save
end
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def destroy_file
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#puts "DELETE THUMBS OF " + APP_CONFIG[:photos_path] + self.path
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File.delete( self.path_original ) if File.exists?( self.path_original )
File.delete( self.path_modified("_collection") ) if File.exists?( self.path_modified("_collection") )
File.delete( self.path_modified("_album") ) if File.exists?( self.path_modified("_album") )
File.delete( self.path_modified("_single") ) if File.exists?( self.path_modified("_single") )
File.delete( self.path_modified("_preview") ) if File.exists?( self.path_modified("_preview") )
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end
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end