Class: Grape::Middleware::Versioner::Param

Inherits:
Base
  • Object
show all
Defined in:
lib/grape/middleware/versioner/param.rb

Overview

This middleware sets various version related rack environment variables based on the request parameters and removes that parameter from the request parameters for subsequent middleware and API. If the version substring does not match any potential initialized versions, a 404 error is thrown. If the version substring is not passed the version (highest mounted) version will be used.

Example: For a uri path

/resource?apiver=v1

The following rack env variables are set and path is rewritten to ‘/resource’:

env['api.version'] => 'v1'

Constant Summary

Constants inherited from Base

Base::DEFAULT_PARAMETER, Base::DEFAULT_PATTERN

Constants inherited from Base

Base::TEXT_HTML

Instance Attribute Summary

Attributes inherited from Base

#app, #env, #options

Instance Method Summary collapse

Methods inherited from Base

#cascade?, #default_options, #error_headers, inherited, #mount_path, #parameter_key, #pattern, #potential_version_match?, #prefix, #strict?, #vendor, #version_not_found!, #version_options, #versions

Methods inherited from Base

#after, #call, #call!, #content_type, #content_type_for, #content_types, #default_options, #initialize, #mime_types, #response

Methods included from DSL::Headers

#header

Methods included from Helpers

#context

Constructor Details

This class inherits a constructor from Grape::Middleware::Base

Instance Method Details

#before ⇒ Object 



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# File 'lib/grape/middleware/versioner/param.rb', line 22

def before
  potential_version = Rack::Utils.parse_nested_query(env[Rack::QUERY_STRING])[parameter_key]
  return if potential_version.blank?

  version_not_found! unless potential_version_match?(potential_version)
  env[Grape::Env::API_VERSION] = potential_version
  env[Rack::RACK_REQUEST_QUERY_HASH].delete(parameter_key) if env.key? Rack::RACK_REQUEST_QUERY_HASH
end