Rails-使用Faraday发送图像

Question

I'm trying to make a request to an API sending an image and some other data, and getting the response. That's my code:

file = "assets/images/test.jpg"
conn = Faraday.new(:url => "api_url" ) do |faraday|
  faraday.request :multipart
end
payload = { :profile_pic => Faraday::UploadIO.new(file, 'image/jpeg') }
conn.post "/test", payload

My first problem is that I'm always getting the following error:

Errno::ENOENT (No such file or directory - assets/images/test.png)

I've tried all the paths I could imagine. Where should be saved the image in directories to be found by Faraday?

The second question is about the response, how can I get the response and handle it?

The third one is that, I haven't understand what's the utility of the first parameter of the last call:

conn.post "/hello", payload

I've written "/hello" but don't have any idea about what's the real usage.

And the last one. Could I send a raw image saved in a variable instead of sending a path to Faraday?

EDIT

Now it's working, this is the solution: Be aware that url must be only until .com , the rest of the path must go on conn.post like this example /v1/search . c.adapter :net_http was needed too. Message response is correctly handled in json variable.

Solution:

  url = 'http://url.com'

  file = Rails.root.to_s + "/app/assets/images/test.jpg"
  conn = Faraday.new(:url => url ) do |c|
    c.request :multipart
    c.adapter :net_http
  end
  payload = { :image => Faraday::UploadIO.new(file, 'image/jpeg'), :token => token}

  response = conn.post '/v1/search', payload
  json = JSON.parse response.body

Answer 1

You should try this for your first question :

file = Rails.root.to_s + "/app/assets/images/test.jpg"

For your third question, the first parameters allows you to construct the right URL from the base "api_url". Please see the example from the Readme .

## POST ##

conn.post '/nigiri', { :name => 'Maguro' }  # POST "name=maguro" to http://sushi.com/nigiri