[英]Alter Rails params hash from Rack middleware
I am attempting to add a value to the Rails params hash from a custom Rack middleware object. 我试图从自定义Rack中间件对象的Rails参数哈希添加一个值。 My current approach is using
我目前的方法是使用
class PortalResolver
def initialize(app)
@app = app
end
def call(env)
begin
url = "#{env['rack.url_scheme']}://#{env['HTTP_HOST']}"
request = Rack::Request.new(env)
portal_id = DomainService.domain(url) # DomainService is returning the expected value
request.params['portal_id'] = portal_id
status, headers, response = @app.call(env)
[status, headers, response]
rescue PortalNotFoundError => e
[403, {'Content-Type' => 'text/html'}, ['']]
end
end
end
I'm currently adding the middleware after ActionDispatch::ParamsParser. 我目前正在ActionDispatch :: ParamsParser之后添加中间件。 The parameters don't show up in the Rails params hash from a controller, but do show up in the request.params hash (within the middleware object defined above.) Any ideas?
这些参数不会出现在来自控制器的Rails params散列中,但会显示在request.params散列中(在上面定义的中间件对象中)。任何想法? Help much appreciated.
非常感谢。
The docs for Rack::Request#params
say: Rack::Request#params
的文档说:
Note that modifications will not be persisted in the env.
请注意,修改不会在env中保留。 Use update_param or delete_param if you want to destructively modify params.
如果要破坏性地修改params,请使用update_param或delete_param 。
When you use the line 当你使用该行
request.params['portal_id'] = portal_id
you add the new parameter to the hash created for that instance of Rack::Request, but the env
that is passed on to rails isn't modified. 您将新参数添加到为Rack :: Request实例创建的哈希,但不会修改传递给rails的
env
。 To make the new value available further down the Rack stack use update_param
as the docs suggest: 要在Rack堆栈中进一步使用新值,请使用
update_param
作为文档建议:
request.update_param('portal_id', portal_id)
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