123 lines
2.9 KiB
Ruby
123 lines
2.9 KiB
Ruby
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# frozen_string_literal: true
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require "currency_coverage"
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require "money/currency"
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require "peg"
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# Model backed by the materialized currencies table. Populated incrementally
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# during Provider#backfill. Derives one row per currency with date range.
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class Currency < Sequel::Model(:currencies)
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unrestrict_primary_key
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one_to_many :currency_coverages, key: :iso_code
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many_to_many :providers, join_table: :currency_coverages, left_key: :iso_code, right_key: :provider_key
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dataset_module do
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def active
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cutoff = (Date.today - 30).to_s
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where { end_date >= cutoff }
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end
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def with_providers(keys)
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iso_codes = CurrencyCoverage.where(provider_key: keys)
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.select(:iso_code).distinct
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where(iso_code: iso_codes)
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end
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end
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class << self
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def all
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merge_pegged(super)
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end
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def active
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merge_pegged(super.all)
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end
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def map(&block)
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all.map(&block)
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end
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def find(code)
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code = code.upcase
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peg = Peg.find(code)
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db_record = where(iso_code: code).first
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if db_record
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apply_peg(db_record, peg, where(iso_code: peg.base).first) if peg
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db_record
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elsif peg
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anchor = where(iso_code: peg.base).first
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return unless anchor
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new_pegged(peg, anchor)
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end
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end
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private
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def merge_pegged(db_currencies)
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anchors = db_currencies.to_h { |c| [c.iso_code, c] }
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pegged = Peg.all.filter_map do |peg|
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existing = anchors[peg.quote]
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if existing
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apply_peg(existing, peg, anchors[peg.base])
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nil
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else
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anchor = anchors[peg.base]
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next unless anchor
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new_pegged(peg, anchor)
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end
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end
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(db_currencies + pegged).sort_by(&:iso_code)
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end
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def apply_peg(record, peg, anchor)
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record.instance_variable_set(:@peg, peg)
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return unless anchor
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peg_start = [peg.since, Date.parse(anchor.start_date.to_s)].compact.max.to_s
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record.start_date = peg_start if peg_start < record.start_date.to_s
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record.end_date = anchor.end_date if anchor.end_date.to_s > record.end_date.to_s
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end
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def new_pegged(peg, anchor)
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c = new(iso_code: peg.quote, start_date: anchor.start_date, end_date: anchor.end_date)
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apply_peg(c, peg, anchor)
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c
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end
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end
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attr_reader :peg
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def metadata
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@metadata ||= Money::Currency.find(iso_code)
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end
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def to_h
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{
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iso_code: iso_code,
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iso_numeric: metadata&.iso_numeric,
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name: metadata&.name || iso_code,
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symbol: metadata&.symbol,
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start_date: start_date.to_s,
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end_date: end_date.to_s,
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}
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end
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def providers
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CurrencyCoverage.where(iso_code: iso_code)
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.order(:provider_key)
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.select_map(:provider_key)
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end
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def to_h_with_providers
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h = to_h.merge(providers: providers)
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h[:peg] = { base: peg.base, rate: peg.rate, authority: peg.authority } if peg
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h
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end
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end
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