48 lines
1.3 KiB
Ruby
48 lines
1.3 KiB
Ruby
# https://github.com/ccmcbeck/after-commit
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module TrackSavedChanges
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extend ActiveSupport::Concern
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included do
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# expose the details if consumer wants to do more
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# attr_reader :ts_saved_changes_history, :ts_saved_changes_unfiltered
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after_initialize :ts_reset_saved_changes
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after_save :ts_track_saved_changes
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end
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# on initalize, but useful for fine grain control
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def ts_reset_saved_changes
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@ts_saved_changes_unfiltered = {}
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@ts_saved_changes_history = []
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end
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# filter out any changes that result in the original value
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def ts_saved_changes
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@ts_saved_changes_unfiltered.reject { |_k, v| v[0] == v[1] }
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end
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private
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# on save
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def ts_track_saved_changes
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# maintain an array of ActiveModel::Dirty.changes
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@ts_saved_changes_history << previous_changes.dup
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# accumulate the most recent changes
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@ts_saved_changes_history.last.each_pair { |k, v| ts_track_saved_change k, v }
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end
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# v is an an array of [prev, current]
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def ts_track_saved_change(key, value)
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if @ts_saved_changes_unfiltered.key? key
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@ts_saved_changes_unfiltered[key][1] = ts_track_saved_value value[1]
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else
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@ts_saved_changes_unfiltered[key] = value.dup
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end
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end
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# type safe dup inspred by http://stackoverflow.com/a/20955038
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def ts_track_saved_value(value)
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value.dup
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rescue TypeError
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value
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end
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end
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