MONGOID-5888 Ensure deeply nested children are validated correctly #6028
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With #6012 (MONGOID-5848, reverting a change that caused a performance regression), validation failures of deeply nested children (i.e. grandchildren and deeper) no longer interrupt the transaction for saving a parent. This PR addresses that by adding a new internal flag (
children_may_have_changed) that thechangedAPI now uses to indicate whether a document should validate it's children or not.The value of that flag is set to true when a child document is processed via nested attributes.