[I] [Question] Does Apache Fory support field validation inside *.fdl? [fory]

["tempcomp123456789 (via GitHub)" <gi...@apache.org>]

tempcomp123456789 opened a new issue, #3904:
URL: https://github.com/apache/fory/issues/3904

   ### Question
   
   **Hi.**
   
   **Does Apache Fory support field validation inside \*.fdl , similar to Protobuf tools (Protovalidate (CEL)/protoc-gen-validate (PGV))**  ❓
   
   ~https://fory.apache.org/docs/compiler/protobuf_idl_support/~
   
   
   ```proto
   syntax = "proto3";
   
   package v1.user;
   
   import "buf/validate/validate.proto";
   
   message UserProfile {
     string id = 1 [(buf.validate.field).string.uuid = true];
   
     // Numeric boundaries
     uint32 age = 2 [(buf.validate.field).uint32.gte = 18, (buf.validate.field).uint32.lte = 120];
   
     string email = 3 [(buf.validate.field).string.email = true];
   
     // Length constraints and regex pattern matching
     string username = 4 [
       (buf.validate.field).string.min_len = 3,
       (buf.validate.field).string.max_len = 30,
       (buf.validate.field).string.pattern = "^[a-zA-Z0-9_]+$"
     ];
   
     // Collection constraint (ensure list contains at least one item)
     repeated string roles = 5 [(buf.validate.field).repeated.min_items = 1];
   }
   
   ```


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Re: [I] [Question] Does Apache Fory support field validation inside *.fdl? [fory]

["chaokunyang (via GitHub)" <gi...@apache.org>]

chaokunyang commented on issue #3904:
URL: https://github.com/apache/fory/issues/3904#issuecomment-5140481309

   Thanks for raising this question.
   
   Currently, Apache Fory does not support field validation rules in FDL like Protovalidate or protoc-gen-validate.
   
   If added in the future, validation would likely be generated as a separate validator instead of being embedded into the serialization/deserialization path.
   
   For example:
   
   ```fdl
   struct User {
       string email @validate(email);
       int age @validate(gte=18);
   }
   ```
   
   could generate:
   
   ```
   User user = serializer.deserialize(bytes);
   validator.validate(user);
   ```
   
   This keeps Fory's serialization performance unchanged while allowing users to enable validation when needed.


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