43 lines
1.2 KiB
Ruby
43 lines
1.2 KiB
Ruby
require "paper_trail/attribute_serializers/cast_attribute_serializer"
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module PaperTrail
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module AttributeSerializers
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# Serialize or deserialize the `version.object_changes` column.
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class ObjectChangesAttribute
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def initialize(item_class)
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@item_class = item_class
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end
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def serialize(changes)
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alter(changes, :serialize)
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end
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def deserialize(changes)
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alter(changes, :deserialize)
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end
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private
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# Modifies `changes` in place.
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# TODO: Return a new hash instead.
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def alter(changes, serialization_method)
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# Don't serialize before values before inserting into columns of type
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# `JSON` on `PostgreSQL` databases.
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return changes if object_changes_col_is_json?
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serializer = CastAttributeSerializer.new(@item_class)
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changes.clone.each do |key, change|
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# `change` is an Array with two elements, representing before and after.
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changes[key] = Array(change).map do |value|
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serializer.send(serialization_method, key, value)
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end
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end
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end
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def object_changes_col_is_json?
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@item_class.paper_trail.version_class.object_changes_col_is_json?
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end
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end
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end
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end
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