Resultado de búsqueda
Definition. $project. Passes along the documents with the requested fields to the next stage in the pipeline. The specified fields can be existing fields from the input documents or newly computed fields. Compatibility. You can use $project for deployments hosted in the following environments:
- Project Fields to Return from Query
By default, queries in MongoDB return all fields in matching...
- Project Fields to Return from Query
By default, queries in MongoDB return all fields in matching documents. To limit the amount of data that MongoDB sends to applications, you can include a projection document to specify or restrict fields to return.
El operador $project en las operaciones de agregación en MongoDB te permite dar forma a la salida de tus consultas, seleccionando los campos que deseas mostrar y aplicando transformaciones a esos campos.
Learn how to use the $project stage to pass only the specified fields to the next aggregation stage. See an example with the sample_restaurants database and the projection operator.
1 de jul. de 2019 · We explained what $project does in aggregation and how to use it. We also went through an example of specifying a field, omitting the _id, and creating a computed field. We’ll leave it to you to explore using some of the other stages along with the $project stage to see what you can do.
26 de nov. de 2019 · In MongoDB, the $project stage is extremely useful for showing only the fields you need. Here, we walk through an example using $project and $lookup.
$project¶ Passes along the documents with only the specified fields to the next stage in the pipeline. The specified fields can be existing fields from the input documents or newly computed fields.
