DOCSP-45003: Specify Fields to Include #291
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stephmarie17
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Nov 13, 2024
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| The following example uses the ``Find()`` method to find all restaurants in which the ``name`` | ||
| field value is ``"Emerald Pub"``. Then, the code calls the ``Project()`` | ||
| method to instruct the find operation to include the ``name`` and ``address`` fields |
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[q] Should this be updated to match the code snippet?
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| method to instruct the find operation to include the ``name`` and ``address`` fields | |
| method to instruct the find operation to include the ``name`` and ``cuisine`` fields |
| Specify Fields to Exclude | ||
| ~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
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| To specify the fields to include from the result, chain the ``Project()`` method |
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Typo:
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| To specify the fields to include from the result, chain the ``Project()`` method | |
| To specify the fields to exclude from the result, chain the ``Project()`` method |
mcmorisi
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rstam
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Nov 14, 2024
| [BsonElement("coord")] | ||
| public double[] Coordinates { get; set; } | ||
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| public string Street { get; set; } |
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Did you mean to omit [BsonElement] here?
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| public class Address | ||
| { | ||
| public string Building { get; set; } |
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Did you mean to omit [BsonElement] here?
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| In this guide, you can learn how to specify which fields to return from a read | ||
| operation by using a **projection**. A projection is a document that specifies | ||
| which fields MongoDB returns from a query. |
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Something to consider is that projections don't play nicely with POCOs.
When you only return some of the fields from the server your POCO is incomplete. Depending on how the serialization is done either the missing fields will be null (or other suitable default value) in your POCO result or perhaps even an exception might be thrown for missing fields.
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I'll update this page to avoid using POCOs
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Pull Request Info
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JIRA - https://jira.mongodb.org/browse/DOCSP-45003
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