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fc3ade392a
* Reindent TimeSeries classes * Fix spacing in time series tests * Remove trend tests where current is nil I think if we've gotten this far with a nil value for current, there's a data integrity problem. If we allow this, we'll have to be very defensive in our code. Best to raise and fix early. * Reindent Money class * Refactor TimeSeries artifacts * Use as_json in TimeSeries * Bring back tests for trends where current is nil * Bring back trend test * Correctly enumerate trend test * Use favorable_direction for trend_styles helper * Make trend public in TimeSeries::Value * Allow nil current values in trends I think I might've gotten it wrong before, nils might appear in trends if values are unavailable for snapshots * Clean up TimeSeries::Trend * Skip trend values same class validations if any values are nil * Refactor Money * Remove object parsing in TimeSeries::Value We're only every passing hashes
58 lines
1.2 KiB
Ruby
58 lines
1.2 KiB
Ruby
class TimeSeries
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DIRECTIONS = %w[ up down ].freeze
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attr_reader :values, :favorable_direction
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def self.from_collection(collection, value_method)
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collection.map do |obj|
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{
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date: obj.date,
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value: obj.public_send(value_method),
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original: obj
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}
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end.then { |data| new(data) }
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end
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def initialize(data, favorable_direction: "up")
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@favorable_direction = (favorable_direction.presence_in(DIRECTIONS) || "up").inquiry
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@values = initialize_values data
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end
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def first
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values.first
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end
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def last
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values.last
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end
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def on(date)
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values.find { |v| v.date == date }
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end
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def trend
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TimeSeries::Trend.new \
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current: last&.value,
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previous: first&.value,
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series: self
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end
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# `as_json` returns the data shape used by D3 charts
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def as_json
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{
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values: values.map(&:as_json),
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trend: trend.as_json,
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favorable_direction: favorable_direction
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}.as_json
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end
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private
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def initialize_values(data)
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[ nil, *data ].each_cons(2).map do |previous, current|
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TimeSeries::Value.new **current,
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previous_value: previous.try(:[], :value),
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series: self
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end
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end
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end
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