Tests if an attribute does not exist in a document.

Command Syntax

attr(attribute).notExists()

Usage

const d = new Dynaflo(config);

d.table('Movies')
  .update({year: 2015})
  .set({title: 'New Title'})
  .when(attr('title').notExists())
  .run()
  .then(data => {
    // only updates the title when the document does not have a title attribute
  });

AWS Doc Links

Condition Expressions