Class: Fleximage::LegacyView

Inherits:
Object
  • Object
show all
Defined in:
lib/fleximage/legacy_view.rb

Overview

Renders a .flexi template

Defined Under Namespace

Classes: TemplateDidNotReturnImage

Instance Method Summary collapse

Constructor Details

#initialize(view) ⇒ LegacyView

Returns a new instance of LegacyView.



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# File 'lib/fleximage/legacy_view.rb', line 8

def initialize(view)
  @view = view
end

Instance Method Details

#render(template, local_assigns = {}) ⇒ Object 



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# File 'lib/fleximage/legacy_view.rb', line 12

def render(template, local_assigns = {})
  # process the view
  result = @view.instance_eval do
    
    # Shorthand color creation
    def color(*args)
      if args.size == 1 && args.first.is_a?(String)
        args.first
      else
        Magick::Pixel.new(*args)
      end
    end
    
    # inject assigns into instance variables
    assigns.each do |key, value|
      instance_variable_set "@#{key}", value
    end
    
    # inject local assigns into reader methods
    local_assigns.each do |key, value|
      class << self; self; end.send(:define_method, key) { value }
    end
    
    #execute the template
    eval(template)
  end
  
  # Raise an error if object returned from template is not an image record
  unless result.class.include?(Fleximage::Model::InstanceMethods)
    raise TemplateDidNotReturnImage, ".flexi template was expected to return a model instance that acts_as_fleximage, but got an instance of <#{result.class}> instead."
  end
  
  # Figure out the proper format
  requested_format = (@view.params[:format] || :jpg).to_sym
  raise 'Image must be requested with an image type format.  jpg, gif and png only are supported.' unless [:jpg, :gif, :png].include?(requested_format)
  
  # Set proper content type
  @view.controller.headers["Content-Type"] = Mime::Type.lookup_by_extension(requested_format.to_s).to_s
  
  # get rendered result
  rendered_image = result.output_image(:format => requested_format)
  
  # Return image data
  return rendered_image
ensure

  # ensure garbage collection happens after every flex image render
  rendered_image.dispose!
  GC.start
end