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Problemas al enviar una clave de objeto a otro objeto (Nodo)

Estoy tratando de enviar Cantidad variable a otro objeto que comparte la misma ID para Producto. (Estoy usando MongoDB) Incluso registra el resultado especificado a continuación, pero luego ocurre un error

 for (let i = 0; i < product.length; i++){ for (let j = 0; j < cartRegistry.length; j++){ if ( cartRegistry[i].ProductId === (product[j]._id.toString()) ){ console.log(product[j]._id.toString()) console.log(cartRegistry[i].ProductId, product[j]._id) console.log('true') } /* console.log(quantity[i].id === product[j]._id.toString()) */ } }

C:\Usuarios\Toni\Documentos\Nodo Aulas\tienda\rutas\cart.js:22 if ( cartRegistry[i].ProductId === (producto[j]._id.toString()) ){ ^

TypeError: No se pueden leer las propiedades de undefined (leyendo '_id') en C:\Users\Toni\Documents\Aulas Node\store\routes\cart.js:22:60

about 4 years ago · Juan Pablo Isaza
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