Each RavenDB document has metadata properties attached to it, which are being used internally but can be exposed to your code. This is usually used for things about the entity, which aren't a direct part of it. More metadata keys are used for storing replication information, concurrency bookkeeping and ACL used for securing the entity.
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Getting the metadata for an entity is quite easy. GetMetadataFor on the entity, like so:. Metadata can be easily used when querying, too. For example, to create an index returning all entities by their entity name, you can use the following Map function:. Using the HTTP API, some metadata is sent as headers when getting and manipulating a single document, and as a JSON document embedded in the entity's document inside the metadata element when dealing with multiple documents. While metadata was originally meant to be used by RavenDB itself, it is also possible to add your own data to the metadata.
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This is useful when you have data about the entity you want to store, and it doesn't make sense to store it within the entity itself. Explicitly - after retrieving a RavenJObject holding the metadata by calling session. GetMetadatFor entity method call, you can explicitly manipulate that object and add keys of your own.
Those changes will be tracked in the Unit of Work, and persisted following the next call to SaveChanges. Listeners - documentStore. In each of those approaches, you get an access to the metadata instance, which you can then manipulate for your own needs. Common reasons to do this include wanting to add additional information for indexes to index, communicating with a server side bundle or simply having an out of band channel to store additional information about a document. Skip to content. Code Pull requests 0 Projects 0 Security Pulse. Permalink Dismiss Join GitHub today GitHub is home to over 36 million developers working together to host and review code, manage projects, and build software together.
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