Method: Parse::Core::Actions#relation_change_operations

Defined in:
lib/parse/model/core/actions.rb

#relation_change_operations ⇒ Array

Generates an array with two entries for addition and removal operations. The first entry of the array will contain a hash of all the change operations regarding adding new relational objects. The second entry in the array is a hash of all the change operations regarding removing relation objects from this field.

Returns:

  • (Array) —

    an array with two hashes; the first is a hash of all the addition operations and the second hash, all the remove operations.



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# File 'lib/parse/model/core/actions.rb', line 582

def relation_change_operations
  return [{}, {}] unless relation_changes?

  additions = []
  removals = []
  # go through all the additions of a collection and generate an action to add.
  relation_updates.each do |field, collection|
    if collection.additions.count > 0
      additions.push Parse::RelationAction.new(field, objects: collection.additions, polarity: true)
    end
    # go through all the additions of a collection and generate an action to remove.
    if collection.removals.count > 0
      removals.push Parse::RelationAction.new(field, objects: collection.removals, polarity: false)
    end
  end
  # merge all additions and removals into one large hash
  additions = additions.reduce({}) { |m, v| m.merge! v.as_json }
  removals = removals.reduce({}) { |m, v| m.merge! v.as_json }
  [additions, removals]
end