50 lines
No EOL
1.3 KiB
Ruby
50 lines
No EOL
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 :saved_changes_history, :saved_changes_unfiltered
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after_initialize :reset_saved_changes
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after_save :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 reset_saved_changes
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@saved_changes_unfiltered = {}
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@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 saved_changes
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@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 track_saved_changes
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# maintain an array of ActiveModel::Dirty.changes
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@saved_changes_history << changes.dup
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# accumulate the most recent changes
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@saved_changes_history.last.each_pair { |k, v| 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 track_saved_change(k, v)
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if @saved_changes_unfiltered.key? k
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@saved_changes_unfiltered[k][1] = track_saved_value v[1]
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else
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@saved_changes_unfiltered[k] = v.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 track_saved_value(v)
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begin
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v.dup
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rescue TypeError
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v
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end
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end
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end |