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Value Transformation
Terminology
| Term | Description |
|---|---|
| transformation function | a function of A->B, e.g. conversion strings to dates |
| decoding | a process of transforming (invalid) values into potentially valid ones (IN), m/decoder & m/decode |
| encoding | a process of transforming (valid) values into something else (OUT), m/encoder & m/encode |
| transformer | a top-level component that maps Schemas with transformation functions (e.g. “json-transformer transforms strings to dates, but not strings to numbers”). Needed in encoding and decoding, mt/transformer |
| named transformer | If a transformer has :name defined, Schemas can define their transformation functions (for both encoding & decoding) using Schema properties |
| interceptor | a component that bundles transforming functions into transforming phases |
| transforming phase | either :enter or :leave, timing when a transformation function is applied in the chain (before or after the fact) |
| interceptor chain | a sequence of interceptors that is used to run the (optimized sequence of) transformation functions from interceptors in correct order |
| transformation chain | transformers compose too: (mt/transformer {:name :before} mt/json-transformer {:name :after}) |
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