module Paperclip::Meta::Attachment
Public Instance Methods
aspect_ratio(style = default_style)
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# File lib/paperclip/meta/attachment.rb, line 34 def aspect_ratio(style = default_style) width(style).to_f / height(style).to_f end
assign_attributes()
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Calls superclass method
# File lib/paperclip/meta/attachment.rb, line 4 def assign_attributes super assign_meta if content_type =~ /\Aimage\/.*\Z/ end
height(style = default_style)
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# File lib/paperclip/meta/attachment.rb, line 26 def height(style = default_style) read_meta style, :height end
image_size(style = default_style)
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Return image dimesions (“WxH”) for given style name. If style name not given, return dimesions for default_style.
# File lib/paperclip/meta/attachment.rb, line 40 def image_size(style = default_style) "#{width(style)}x#{height(style)}" end
post_process_styles(*styles)
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Calls superclass method
# File lib/paperclip/meta/attachment.rb, line 16 def post_process_styles(*styles) super(*styles) assign_meta end
save()
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Calls superclass method
# File lib/paperclip/meta/attachment.rb, line 9 def save if @queued_for_delete.any? && @queued_for_write.empty? instance_write(:meta, meta_encode({})) end super end
size(style = nil)
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Use meta info for style if required
Calls superclass method
# File lib/paperclip/meta/attachment.rb, line 22 def size(style = nil) style ? read_meta(style, :size) : super() end
width(style = default_style)
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# File lib/paperclip/meta/attachment.rb, line 30 def width(style = default_style) read_meta style, :width end
Private Instance Methods
assign_meta()
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# File lib/paperclip/meta/attachment.rb, line 46 def assign_meta return unless content_type =~ /\Aimage\/.*\Z/ return unless instance.respond_to?(:"#{name}_meta=") meta = populate_meta(@queued_for_write) return if meta == {} write_meta(meta) end
merge_existing_meta_hash(meta)
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Retain existing meta values that will not be recalculated when reprocessing a subset of styles
# File lib/paperclip/meta/attachment.rb, line 95 def merge_existing_meta_hash(meta) return unless (original_meta = instance.send("#{name}_meta")) meta.reverse_merge! meta_decode(original_meta) end
meta_decode(meta)
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Return decoded metadata as Object
# File lib/paperclip/meta/attachment.rb, line 88 def meta_decode(meta) return meta if meta.is_a?(Hash) Marshal.load(Base64.decode64(meta)) end
meta_encode(meta)
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Return encoded metadata as String
# File lib/paperclip/meta/attachment.rb, line 83 def meta_encode(meta) Base64.encode64(Marshal.dump(meta)) end
populate_meta(queue)
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# File lib/paperclip/meta/attachment.rb, line 55 def populate_meta(queue) meta = {} queue.each do |style, file| begin geo = Geometry.from_file file meta[style] = { width: geo.width.to_i, height: geo.height.to_i, size: file.size } rescue Paperclip::Errors::NotIdentifiedByImageMagickError meta[style] = {} end end meta end
read_meta(style, item)
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Return meta data for given style
# File lib/paperclip/meta/attachment.rb, line 74 def read_meta(style, item) if instance.respond_to?(:"#{name}_meta") && instance_read(:meta) if (meta = meta_decode(instance_read(:meta))) meta[style] && meta[style][item] end end end
write_meta(meta)
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# File lib/paperclip/meta/attachment.rb, line 68 def write_meta(meta) merge_existing_meta_hash meta instance.send("#{name}_meta=", meta_encode(meta)) end