Method: Fleximage::View#render

Defined in:
lib/fleximage/view.rb

#render(template) ⇒ Object 



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# File 'lib/fleximage/view.rb', line 16

def render(template)
  # process the view
  result = @view.instance_eval do
    
    # Shorthand color creation
    def color(*args)
      Fleximage::Operator::Base.color(*args)
    end
    
    #execute the template
    eval(template.source)
  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
  unless [:jpg, :gif, :png].include?(requested_format)
    raise 'Image must be requested with an image type format. jpg, gif and png only are supported.'
  end
  
  # Set proper content type
  @view.controller.response.content_type = Mime::Type.lookup_by_extension(requested_format.to_s).to_s
  
  # Set proper caching headers
  if defined?(Rails) && Rails.env == 'production'
    @view.controller.response.headers['Cache-Control'] = 'public, max-age=86400'
  end
  
  # return rendered result
  return result.output_image(:format => requested_format)
ensure

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