Class: BankofcanadaAsDataframe::Client

Inherits:
Object
  • Object
show all
Includes:
HTTParty
Defined in:
lib/bankofcanada_as_dataframe/client.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(series, options = {}) ⇒ Client

Returns a new instance of Client.



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# File 'lib/bankofcanada_as_dataframe/client.rb', line 15

def initialize(series, options={})
  @tag = series
end

Instance Attribute Details

#tag ⇒ Object (readonly)

Returns the value of attribute tag.



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# File 'lib/bankofcanada_as_dataframe/client.rb', line 13

def tag
  @tag
end

Class Method Details

.list_series ⇒ Object 



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# File 'lib/bankofcanada_as_dataframe/client.rb', line 30

def self.list_series
  dta = (get('/lists/series/json').parsed_response)['series']

  series = dta.keys
  desc = series.map{|s| [dta[s]['label'], dta[s]['description']].join('; ') }

  Polars::Config.set_tbl_rows(-1)
  Polars::DataFrame.new({Series: series, Description: desc})
end

Instance Method Details

#fetch(start: nil, fin: nil) ⇒ Object 



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# File 'lib/bankofcanada_as_dataframe/client.rb', line 19

def fetch(start: nil, fin: nil)
  dta = observations({}).parsed_response['observations']
  dta = dta.select{|d| start.nil? ? true : Date.parse(d['d']) >= _parse_date(start) } unless start.nil?
  dta = dta.select{|d| fin.nil? ? true : Date.parse(d['d']) <= _parse_date(fin) } unless fin.nil?

  dates = dta.map{|d| Date.parse(d['d']) }
  vals = dta.map{|d| d[tag]['v'].to_f }

  Polars::DataFrame.new({Timestamps: dates, Values: vals})
end