下午好，我亲爱的铁路开发人员。我是Clement，一个ruby on rails beginer，我刚开始研究我的第一个项目，即创建一个在线业务平台。我的问题是关于如何向我的应用添加股票图表但幸运的是，我发现了quandl gem我听说非常适合。但我现在唯一的问题是如何通过创建视图，控制器和配置它来渲染股票图表可以让任何人在应用程序中工作的宝石帮助我完成程序的代码，并通过快速教程介绍如何配置gem以及如何获取在视图中呈现的提要，向我介绍该部分。我们将非常感谢您的帮助.Below是
的github存储库Quandl Ruby Client Build Status
The official ruby gem for all your data needs! The Quandl client can be used to interact with the latest version of the Quandl RESTful API.
Deprecation of old package
With the release of our v3 API we are officially deprecating version 2 of the quandl_client ruby gem. We have re-written the package from the ground up and will be moving forward with a 1.x.x package with the name of quandl that will rely on version 3 of our restful api. During this transitional period you can continue to use the old package here:
https://rubygems.org/gems/quandl_client
Installation
gem 'quandl'
Configuration
Option Explanation Example
api_key Your access key tEsTkEy123456789
api_version The version you wish to access the api with 2015-04-09
require 'quandl'
Quandl::ApiConfig.api_key = 'tEsTkEy123456789'
Quandl::ApiConfig.api_version = '2015-04-09'
Retrieving Data
Dataset
Retrieving dataset data can be done in a similar way to Databases. For example to retrieve a dataset use its full code:
require 'quandl'
Quandl::Dataset.get('WIKI/AAPL')
=> ... dataset ...
You can also retrieve a list of datasets associated to a database by using the Database helper method:
Quandl::Database.get('WIKI').datasets
=> ... datasets results ...
By default, each list query will return page 1 of the first 100 results (Please see the API Documentation for more detail)
Data
Dataset data can be queried through a dataset. For example:
require 'quandl'
Quandl::Dataset.get('WIKI/AAPL').data
=> ... data ...
you can access the data much like you would other lists. In addition all the data column fields are mapped to their column_names for convenience:
Quandl::Dataset.get('WIKI/AAPL').data.first.date
=> ... date ...
Database
To retrieve a database simply use its code with the get parameter:
require 'quandl'
Quandl::Database.get('WIKI')
=> ... wiki database ...
You can also retrieve a list of databases by using:
Quandl::Database.all
=> ... results ...
Download Entire Database (Bulk Download)
To get the url for downloading all dataset data of a database:
require 'quandl'
Quandl::ApiConfig.api_key = 'tEsTkEy123456789'
Quandl::Database.get('ZEA').bulk_download_url
=> "https://www.quandl.com/api/v3/databases/ZEA/data?api_key=tEsTkEy123456789"
To bulk download all dataset data of a database:
Quandl::ApiConfig.api_key = 'tEsTkEy123456789'
Quandl::Database.get('ZEA').bulk_download_to_file('/path/to/destination/file_or_folder')
The file or folder path can either be specified as a string or as a File.
For bulk download of premium databases, please ensure that a valid api_key is set, as authentication is required.
For both bulk_download_url and bulk_download_to_file, an optional download_type query parameter can be passed in:
Quandl::Database.get('ZEA').bulk_download_to_file('.', params: {download_type: 'partial'})
If download_type is not specified, a complete bulk download will be performed. Please see the API Documentation for more detail.
Working with results
Instance
All data once retrieved is abstracted into custom classes. You can get a list of the fields in each class by using the data_fields method.
require 'quandl'
database = Quandl::Database.get('WIKI')
database.data_fields
=> ["id", "name", "database_code", "description", "datasets_count", "downloads", "premium", "image"]
You can then uses these methods in your code. Additionally you can access the data by using the hash equalivalent lookup.
database = Quandl::Database.get('WIKI')
database.database_code
=> 'WIKI'
database['database_code']
=> 'WIKI'
In some cases name of the fields returned by the API may not be compatible with the ruby language syntax. These will be converted into compatible field names.
data = Quandl::Dataset.get('WIKI/AAPL').data(params: { limit: 1 }).first
data.column_names
=> ["Date", "Open", "High", "Low", "Close", "Volume", "Ex-Dividend", "Split Ratio", "Adj. Open", "Adj. High", "Adj. Low", "Adj. Close", "Adj. Volume"]
data.data_fields
=> ["date", "open", "high", "low", "close", "volume", "ex_dividend", "split_ratio", "adj_open", "adj_high", "adj_low", "adj_close", "adj_volume"]
List
Most list queries will return a paginated list of results. You can check whether the resulting list has more data by using the more_results? method. By default, each list query will return page 1 of the first 100 results (Please see the API Documentation for more detail). Depending on its results you can pass additional params to filter the data:
require 'quandl'
databases = Quandl::Database.all
=> ... results ...
databases.more_results?
=> true
Quandl::Database.all(params: { page: 2 })
=> ... more results ...
Lists also function as arrays and can be iterated through. Note however that using these features will only work on the current page of data you have locally. You will need to continue to fetch results and iterate again to loop through the full result set.
databases = Quandl::Database.all
databases.each { |d| puts d.database_code }
=> ... print database codes ...
databases.more_results?
=> true
Quandl::Database.all(params: { page: 2 }).each { |d| puts d.database_code }
=> ... print more database codes ...
Lists also return metadata associated with the request. This can include things like the current page, total results, etc. Each of these fields can be accessed through a hash or convenience method.
Quandl::Database.all.current_page
=> 1
Quandl::Database.all['current_page']
=> 1
As a convenience method lists can also return their data in CSV form. To do this simply issue the .to_csv method on a list:
databases = Quandl::Database.all.to_csv
=> "Id,Name,Database Code,Description,Datasets Count,Downloads,Premium,Image,Bundle Ids,Plan ...
Additional Links
Quandl
Quandl Tools
API Docs
License