ruby 类型错误：没有将 nil 隐式转换为字符串错误
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TypeError: no implicit conversion of nil into String error
提问by nktokyo
I am trying to set up our CRM system to create posts in wordpress when a specific type of record (a listing) is added.
我正在尝试设置我们的 CRM 系统以在添加特定类型的记录（列表）时在 wordpress 中创建帖子。
I found this tutorialand am testing it in the rails console.
我找到了本教程，并在 rails 控制台中对其进行了测试。
My class is:
我的班级是：
require 'rubygems'
require 'open-uri'
require 'json'
require 'net/http'
# Please note that the vanilla wp-json-api plugin does not support user authentication for create_post.
# Check out my fork for authentication support: https://github.com/Achillefs/wp-json-api
class Listing
API_URI = 'http://my_wp_url/api/'
API_USER = 'my_username'
API_PASS = 'my_password'
attr_accessor :title, :address, :sell_price, :type
def initialize(opts = {})
# set all values if valid
opts.each do |key,val|
begin
self.send(:"#{key}=",val)
rescue NoMethodError => e
raise ArgumentError("#{key} is not a valid listing attribute")
end
end
self.type = 'post' if self.type == nil
end
def publish!
# Need to get a nonce token from WP in order to create a post
nonce_response = JSON.parse(open(API_URI + "get_nonce/?controller=posts&method=create_post").read)
if nonce_response['status'] == 'ok'
nonce = nonce_response['nonce']
url = URI.parse(API_URI + "posts/create_post")
args = {
'nonce' => nonce, 'author' => API_USER, 'user_password' => API_PASS,
'status' => 'draft', 'title' => self.title
}
resp, data = Net::HTTP.post_form(url, args)
response = JSON.parse(data)
if response['status'] == 'ok'
puts response.inspect
else
raise response['error'].to_s
end
else
raise nonce_response['error'].to_s
end
end
end
And the output in the console is as follows
并且控制台中的输出如下
2.0.0-p353 :001 > require 'listing'
=> true
2.0.0-p353 :002 > l = Listing.new(:title => "test")
=> #<Listing:0x007fab9286a2c8 @title="test", @type="post">
2.0.0-p353 :003 > l.publish!
TypeError: no implicit conversion of nil into String
from /Users/Nick/.rvm/gems/ruby-2.0.0-p353@railstutorial_rails_4_0/gems/json-1.8.1/lib/json/common.rb:155:in `initialize'
from /Users/Nick/.rvm/gems/ruby-2.0.0-p353@railstutorial_rails_4_0/gems/json-1.8.1/lib/json/common.rb:155:in `new'
from /Users/Nick/.rvm/gems/ruby-2.0.0-p353@railstutorial_rails_4_0/gems/json-1.8.1/lib/json/common.rb:155:in `parse'
from /Users/Nick/rails_projects/wp_api/lib/listing.rb:38:in `publish!'
from (irb):3
from /Users/Nick/.rvm/gems/ruby-2.0.0-p353@railstutorial_rails_4_0/gems/railties-4.0.2/lib/rails/commands/console.rb:90:in `start'
from /Users/Nick/.rvm/gems/ruby-2.0.0-p353@railstutorial_rails_4_0/gems/railties-4.0.2/lib/rails/commands/console.rb:9:in `start'
from /Users/Nick/.rvm/gems/ruby-2.0.0-p353@railstutorial_rails_4_0/gems/railties-4.0.2/lib/rails/commands.rb:62:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
2.0.0-p353 :004 >
Line 38 is this one
第38行是这个
response = JSON.parse(data)
So I guess I'm getting no response back. I'm relatively new to this and am not sure how to break down the cause.
所以我想我没有得到任何回应。我对此比较陌生，不知道如何分解原因。
Thanks in advance for any help.
在此先感谢您的帮助。
Nick
缺口
采纳答案by Simone Carletti
The error is at this line
错误在这一行
resp, data = Net::HTTP.post_form(url, args)
response = JSON.parse(data)
You are assuming that post_formreturns both a response and a data object, but it looks like the value of datais nil.
您假设它同时post_form返回响应和数据对象，但它的值似乎data为零。
Inspect the content of respand data. I'm quite sure the response body is contained in the respobject.
检查的内容resp和data。我很确定响应主体包含在resp对象中。
You should be able to fetch it using resp.body
你应该能够使用它来获取它 resp.body
response = JSON.parse(resp.body)
