55 lines
2.2 KiB
Ruby
55 lines
2.2 KiB
Ruby
module PaperTrail
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module Cleaner
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# Destroys all but the most recent version(s) for items on a given date
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# (or on all dates). Useful for deleting drafts.
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#
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# Options:
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#
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# - :keeping - An `integer` indicating the number of versions to be kept for
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# each item per date. Defaults to `1`.
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# - :date - Should either be a `Date` object specifying which date to
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# destroy versions for or `:all`, which will specify that all dates
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# should be cleaned. Defaults to `:all`.
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# - :item_id - The `id` for the item to be cleaned on, or `nil`, which
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# causes all items to be cleaned. Defaults to `nil`.
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#
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def clean_versions!(options = {})
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options = {:keeping => 1, :date => :all}.merge(options)
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gather_versions(options[:item_id], options[:date]).each do |item_id, versions|
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group_versions_by_date(versions).each do |date, _versions|
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# Remove the number of versions we wish to keep from the collection
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# of versions prior to destruction.
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_versions.pop(options[:keeping])
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_versions.map(&:destroy)
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end
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end
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end
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private
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# Returns a hash of versions grouped by the `item_id` attribute formatted
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# like this: {:item_id => PaperTrail::Version}. If `item_id` or `date` is
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# set, versions will be narrowed to those pointing at items with those ids
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# that were created on specified date.
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def gather_versions(item_id = nil, date = :all)
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unless date == :all || date.respond_to?(:to_date)
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raise ArgumentError.new("`date` argument must receive a Timestamp or `:all`")
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end
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versions = item_id ? PaperTrail::Version.where(:item_id => item_id) : PaperTrail::Version
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versions = versions.between(date.to_date, date.to_date + 1.day) unless date == :all
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# If `versions` has not been converted to an ActiveRecord::Relation yet,
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# do so now.
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versions = PaperTrail::Version.all if versions == PaperTrail::Version
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versions.group_by(&:item_id)
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end
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# Given an array of versions, returns a hash mapping dates to arrays of
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# versions.
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# @api private
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def group_versions_by_date(versions)
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versions.group_by { |v| v.send(PaperTrail.timestamp_field).to_date }
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end
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end
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end
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