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Versions: 28
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Contents
require 'json'
require 'volt'
module Volt
# Renders responses for HttpController actions
class HttpResponseRenderer
@renderers = {}
class << self
attr_reader :renderers
end
# Register renderers.
def self.register_renderer(name, content_type, proc)
@renderers[name.to_sym] = { proc: proc, content_type: content_type }
end
# Default renderers for json and plain text
register_renderer(:json, 'application/json', proc { |data| data.to_json })
register_renderer(:text, 'text/plain', proc { |data| data.to_s })
# Iterate through @renderes to find a matching renderer for the given
# content and call the given proc.
# Other params from the content are returned as additional headers
# Returns an empty string if no renderer could be found
def render(content)
content = content.symbolize_keys
self.class.renderers.keys.each do |renderer_name|
if content.key?(renderer_name)
renderer = self.class.renderers[renderer_name]
to_render = content.delete(renderer_name)
rendered = renderer[:proc].call(to_render)
# Unwrap a promise if we got one back
if rendered.is_a?(Promise)
rendered = rendered.sync
end
return [rendered, content.merge(content_type: renderer[:content_type])]
end
end
# If we couldn't find a renderer - just render an empty string
["Error: render only supports #{self.class.renderers.keys.join(', ')}", content_type: 'text/plain']
end
end
end
Version data entries
28 entries across 28 versions & 1 rubygems