Class: PaperTrailHashDiff

Inherits:
Object
  • Object
show all
Defined in:
lib/paper_trail_hashdiff.rb

Overview

Allows storing only incremental changes in the object_changes column Uses HashDiff (github.com/liufengyun/hashdiff)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(only_objects: false) ⇒ PaperTrailHashDiff

Returns a new instance of PaperTrailHashDiff.



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# File 'lib/paper_trail_hashdiff.rb', line 8

def initialize(only_objects: false)
  @only_objects = only_objects
end

Instance Attribute Details

#only_objects ⇒ Object (readonly)

Returns the value of attribute only_objects.



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# File 'lib/paper_trail_hashdiff.rb', line 6

def only_objects
  @only_objects
end

Instance Method Details

#diff(changes) ⇒ Object 



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# File 'lib/paper_trail_hashdiff.rb', line 12

def diff(changes)
  diff_changes = {}
  changes.each do |field, value_changes|
    diff_changes[field] =
      if !only_objects || (
        value_changes[0] && value_changes[1] &&
        (value_changes[0].is_a?(Hash) || value_changes[0].is_a?(Array))
      )
        Hashdiff.diff(value_changes[0], value_changes[1], array_path: true, use_lcs: false)
      else
        value_changes
      end
  end
  diff_changes
end

#load_changeset(version) ⇒ Object 



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# File 'lib/paper_trail_hashdiff.rb', line 36

def load_changeset(version)
  HashWithIndifferentAccess.new(version.object_changes_deserialized)
end

#where_object_changes(version_model_class, attributes) ⇒ Object 



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# File 'lib/paper_trail_hashdiff.rb', line 28

def where_object_changes(version_model_class, attributes)
  scope = version_model_class
  attributes.each do |k, v|
    scope = scope.where('(((object_changes -> ?)::jsonb ->> 0)::jsonb @> ?)', k.to_s, v.to_s)
  end
  scope
end