Implement "Take" method for selecting a range of items from a superset #3
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jeffrymorris
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in brantburnett/Linq2Couchbase
Oct 18, 2015
Motivation ---------- Provide a method of controlling the keys for documents using an easy POCO approach, but with customizability for more advanced use cases. Modifications ------------- For the default use case, move from a single KeyAttribute property on the document to supporting multiple KeyAttribute properties. Then concatenate their values together, separated by a "-". Control their order with KeyOrderAttribute. An example use case would be documents whose keys are built as a combination of the Type property (i.e. "beer") and a unique id such as an auto-increment or a GUID (i.e. a Number property with the value "1"). By putting a Key and KeyOrder attribute on each property, the generator will give it the key "beer-1". This also works well for simple keys read from a single property. If you only place the Key attribute on one property, its value is used directly. For more advanced use cases, the DocIdGenerator property may be applied to a document. This takes a type that implements IDocIdGenerator, which allows for any kind of custom key building. Notes ----- The limitation of this approach is that it assumes that the document ID generator will always generate the same key the document had when it was read via LINQ. The advantage is that it easily supports creating new documents, since it will generate the new key from the document the same way for new or existing documents. This makes designing an object model with consistent keys easy.
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