如何调用 Ruby 中的函数？

Question

我正在尝试打电话，但我一直收到错误消息。这是我的代码：

require 'rubygems'
require 'net/http'
require 'uri'
require 'json'

class AlchemyAPI

  #Setup the endpoints
  @@ENDPOINTS = {}
  @@ENDPOINTS['taxonomy'] = {}
  @@ENDPOINTS['taxonomy']['url']  = '/url/URLGetRankedTaxonomy'
  @@ENDPOINTS['taxonomy']['text'] = '/text/TextGetRankedTaxonomy'
  @@ENDPOINTS['taxonomy']['html'] = '/html/HTMLGetRankedTaxonomy'

  @@BASE_URL = 'http://access.alchemyapi.com/calls'

  def initialize()

    begin
        key = File.read('C:\Users\KVadher\Desktop\api_key.txt')
        key.strip!

        if key.empty?
            #The key file should't be blank
            puts 'The api_key.txt file appears to be blank, please copy/paste your API key in the file: api_key.txt'
            puts 'If you do not have an API Key from AlchemyAPI please register for one at: http://www.alchemyapi.com/api/register.html'            
            Process.exit(1)
        end

        if key.length != 40
            #Keys should be exactly 40 characters long
            puts 'It appears that the key in api_key.txt is invalid. Please make sure the file only includes the API key, and it is the correct one.'
            Process.exit(1)
        end

        @apiKey = key
    rescue => err
        #The file doesn't exist, so show the message and create the file.
        puts 'API Key not found! Please copy/paste your API key into the file: api_key.txt'
        puts 'If you do not have an API Key from AlchemyAPI please register for one at: http://www.alchemyapi.com/api/register.html'

        #create a blank file to hold the key
        File.open("api_key.txt", "w") {}
        Process.exit(1)
    end
  end

  # Categorizes the text for a URL, text or HTML.
  # For an overview, please refer to: http://www.alchemyapi.com/products/features/text-categorization/
  # For the docs, please refer to: http://www.alchemyapi.com/api/taxonomy/
  # 
  # INPUT:
  # flavor -> which version of the call, i.e.  url, text or html.
  # data -> the data to analyze, either the the url, text or html code.
  # options -> various parameters that can be used to adjust how the API works, see below for more info on the available options.
  #
  # Available Options:
  # showSourceText -> 0: disabled (default), 1: enabled.
  #
  # OUTPUT:
  # The response, already converted from JSON to a Ruby object. 
  #
  def taxonomy(flavor, data, options = {})


    unless @@ENDPOINTS['taxonomy'].key?(flavor)
        return { 'status'=>'ERROR', 'statusInfo'=>'Taxonomy info for ' + flavor + ' not available' }

    end

    #Add the URL encoded data to the options and analyze
    options[flavor] = data
    return analyze(@@ENDPOINTS['taxonomy'][flavor], options)
    print

  end

  **taxonomy(text,"trees",1)**

end

在 ** ** 我已经输入了我的电话。我做错了什么吗？我收到的错误是：

C:/Users/KVadher/Desktop/testrub:139:in `<class:AlchemyAPI>': undefined local variable or method `text' for AlchemyAPI:Class (NameError)
    from C:/Users/KVadher/Desktop/testrub:6:in `<main>'

我感觉好像我在正常打电话，api 代码本身有问题？虽然我可能是错的。

Answer 1

是的，正如 jon snow 所说，函数（方法）调用必须在 class 之外。这些方法与 class.

一起定义

此外，Options 应该是一个 Hash，而不是一个数字，正如您所说的 options[flavor] = data，这会给您带来另一个问题。

我相信你可能想把 text 放在引号中，因为那是你的口味之一。

此外，因为你声明了一个class，这被称为实例方法，你必须创建一个class的实例才能使用它：

my_instance = AlchemyAPI.new
my_taxonomy = my_instance.taxonomy("text", "trees")

这足以使其正常工作，不过您似乎有办法让这一切正常工作。祝你好运！

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