Quandl::Client

Purpose

The purpose of this gem is to interact with the quandl api

Installation

gem 'quandl_client'

Configuration

require 'quandl/client'

Quandl::Client.use 'http://quandl.com/api/'
Quandl::Client.token = ENV['QUANDL_AUTH_TOKEN']

Usage

Quandl::Client::Dataset

Dataset Search

datasets = Quandl::Client::Dataset.query('oil').where(frequency: 'annual', source_code: 'OFDP', page: 2).all
datasets.first.data.limit(10).to_a
=> [[Tue, 22 Oct 1974, 40.45, 41.5, 40.45, 41.35, 191.0, 262.0], ... ]

Available parameters:

query
source_code
frequency
page
per_page
owner

Dataset Data

attributes :data, :source_code, :code, :name, :urlize_name, :description, :updated_at, :frequency, :from_date, :to_date, :column_names, :private, :type

d = Quandl::Client::Dataset.find('OFDP/COBALT_51')
d.data.first
=> [Wed, 14 May 2014, 29500.0, 30500.0, 30000.0]

d = Quandl::Client::Dataset.find('OFDP/COBALT_51')
d.data.collapse('weekly').trim_start("2012-03-31").trim_end("2013-06-30").first
=> [Sun, 30 Jun 2013, 31050.0, 32550.0, 31800.0]

Available parameters:

collapse
transformation
trim_start
trim_end
rows
exclude_headers
row
limit

Create

attributes = {
  code:         "TEST_DATASET",
  frequency:    'daily',
  data:         '2012,10,20',
}
d = Dataset.create( attributes )

Update

d = Dataset.find("TEST_DATASET")
d.name = 'New Name'
d.data = [['2014',10,20],['2013',20,30]]
d.save

Delete

d = Dataset.find('TEST_DATASET')
d.destroy

Delete Data

d = Dataset.find('TEST_DATASET')
d.delete_data
d.data
=> nil

d.delete_rows( '1998-02-01','1998-03-03' )
d.data
=> # given rows are deleted

Quandl::Client::Source

Search

sources = Quandl::Client::Source.query('oil').all

=> [#<Quandl::Client::Source(sources/413) code="STATSCAN5" datasets_count=1>...]

Show

s = Quandl::Client::Source.find('NSE')