Merge openapi:typename Meta keys into the Payload and Result DSL calls if none is provided. This seems like quite a big hammer approach to this problem and this is reflected in the number of tests that are failing as a result of this.

Author: henryjcee

dsl/payload.go

@@ -1,6 +1,8 @@
 package dsl
 
 import (
+	"fmt"
+
 	"goa.design/goa/v3/eval"
 	"goa.design/goa/v3/expr"
 )
@@ -78,7 +80,16 @@ func Payload(val any, args ...any) {
 		eval.IncompatibleDSL()
 		return
 	}
+
+	// Set the result openapi:typename key explicitly from the method name
+	if v, ok := val.(expr.UserType); ok {
+		if v.Attribute().Meta == nil {
+			v.Attribute().Meta = make(expr.MetaExpr)
+		}
+		v.Attribute().Meta.Merge(expr.MetaExpr{"openapi:typename": []string{fmt.Sprintf("%sRequestBody", e.Name)}})
+	}
 	e.Payload = methodDSL(e, "Payload", val, args...)
+
 }
 
 // StreamingPayload defines a method that accepts a stream of instances of the

dsl/result.go

@@ -1,6 +1,8 @@
 package dsl
 
 import (
+	"fmt"
+
 	"goa.design/goa/v3/eval"
 	"goa.design/goa/v3/expr"
 )
@@ -80,6 +82,13 @@ func Result(val any, args ...any) {
 		eval.IncompatibleDSL()
 		return
 	}
+	// Set the result openapi:typename key explicitly from the method name
+	if v, ok := val.(expr.UserType); ok {
+		if v.Attribute().Meta == nil {
+			v.Attribute().Meta = make(expr.MetaExpr)
+		}
+		v.Attribute().Meta.Merge(expr.MetaExpr{"openapi:typename": []string{fmt.Sprintf("%sRequestBody", e.Name)}})
+	}
 	e.Result = methodDSL(e, "Result", val, args...)
 }