Fix #117 (#120)

Register String schema for String payloads.

Author: stavshamir

springwolf-core/src/main/java/io/github/stavshamir/springwolf/schemas/DefaultSchemasService.java

@@ -12,6 +12,7 @@
 import io.swagger.v3.core.converter.ModelConverters;
 import io.swagger.v3.oas.models.media.MapSchema;
 import io.swagger.v3.oas.models.media.Schema;
+import io.swagger.v3.oas.models.media.StringSchema;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 
@@ -64,6 +65,11 @@ public String register(Class<?> type) {
         Map<String, Schema> schemas = converter.readAll(type);
         this.definitions.putAll(schemas);
 
+        if (schemas.size() == 0 && type.equals(String.class)) {
+            this.definitions.put("String", new StringSchema());
+            return "String";
+        }
+
         if (schemas.size() == 1) {
             return new ArrayList<>(schemas.keySet()).get(0);
         }

springwolf-core/src/test/java/io/github/stavshamir/springwolf/schemas/DefaultSchemasServiceTest.java

@@ -17,6 +17,7 @@
 import java.util.Optional;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertNotNull;
 
 public class DefaultSchemasServiceTest {
 
@@ -29,6 +30,16 @@ public class DefaultSchemasServiceTest {
         objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
     }
 
+    @Test
+    public void string() throws IOException, JSONException {
+        String modelName = schemasService.register(String.class);
+
+        assertThat(modelName)
+                .isEqualTo("String");
+
+        assertNotNull(schemasService.getDefinitions().get(modelName));
+    }
+
     @Test
     public void simpleObject() throws IOException, JSONException {
         String modelName = schemasService.register(SimpleFoo.class);