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Headless Server Developer Manual / Version 2110

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4.2.4.3 Fetch Directive Invocation Chain

The @fetch directive alters the default invocation chain by invoking the SpelDataFetcher class instead of the default PropertyDataFetcher class. The SpelDataFetcher uses SpEL to operate either on the query root or invokes instead other Spring Beans. Either way, the invoked object has to return an object or a DataFetcherResult instance. The slightly altered invocation chain of DataFetcher is:

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