add support for additionalProperties when other fields exist

This is a proposed implementation to address the feature requested in #188. Tests still need fixing, but I want to get support on the implementation first.

Signed-off-by: Alex Boten <[email protected]>
Co-authored-by: Alex Boten <[email protected]>
Co-authored-by: Claudio Beatrice <[email protected]>

Author: Alex Boten

pkg/generator/schema_generator.go

@@ -531,6 +531,21 @@ func (g *schemaGenerator) generateStructType(
 		structType.AddField(structField)
 	}
 
+	if t.AdditionalProperties != nil {
+		if valueType, err := g.generateType(t.AdditionalProperties, nil); err != nil {
+			return nil, err
+		} else {
+			structType.AddField(
+				codegen.StructField{
+					Name:         "AdditionalProperties",
+					DefaultValue: map[string]interface{}{},
+					SchemaType:   &schemas.Type{},
+					Type:         valueType,
+				},
+			)
+		}
+	}
+
 	return &structType, nil
 }
 

tests/data/regressions/issue51/issue51.go

@@ -1,7 +1,7 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
   "type": "object",
-  "additionalProperties": true,
+  "additionalProperties": {"type": "string"},
   "properties": {
     "name": {
       "type": "string"