Faraday JSON发布'undefined method bytesize'for have bodies

Question

我试图将一些代码从HTTParty转换为Faraday。以前我是用：

HTTParty.post("http://localhost/widgets.json", body: { name: "Widget" }) 

新的片段是：

faraday = Faraday.new(url: "http://localhost") do |config| 
    config.adapter Faraday.default_adapter 

    config.request :json 
    config.response :json 
end 
faraday.post("/widgets.json", { name: "Widget" }) 

导致：NoMethodError: undefined method 'bytesize' for {}:Hash。法拉第能够自动将我的请求主体序列化为字符串吗？

Answer 1

中间件列表要求按特定顺序构建/堆栈，否则会遇到此错误。第一个中间件被认为是最外层，它封装所有其他人，所以适配器应该是最里面的一个（或最后一个）：

Faraday.new(url: "http://localhost") do |config| 
    config.request :json 
    config.response :json 
    config.adapter Faraday.default_adapter 
end 

，了解更多信息，请参阅Advanced middleware usage。

Answer 2

您可以随时为法拉第创建自己的中间件。

require 'faraday' 

class RequestFormatterMiddleware < Faraday::Middleware 
    def call(env) 
    env = format_body(env) 
    @app.call(env) 
    end 

    def format_body(env) 
    env.body = 'test' #here is any of needed operation 
    env 
    end 
end 

conn = Faraday.new("http://localhost") do |c| 
    c.use RequestFormatterMiddleware 
end 

response = conn.post do |req| 
req.url "http://localhost" 
req.headers['Content-Type'] = 'application/json' 
req.body = '{ "name": "lalalal" }' 
end 

p response.body #=> "test"