Add example allOf with single ref (#10948)

* Add example allOf with single ref

* fix dart-dio-next handling of that case

* Refactor without vendor extension

* Regenerate newer samples

samples/client/petstore/java/feign/.openapi-generator/FILES

@@ -85,3 +85,4 @@ src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
 src/main/java/org/openapitools/client/model/SpecialModelName.java
 src/main/java/org/openapitools/client/model/Tag.java
 src/main/java/org/openapitools/client/model/User.java
+src/main/java/org/openapitools/client/model/UserType.java

samples/client/petstore/java/feign/api/openapi.yaml

@@ -1482,6 +1482,7 @@ components:
         userStatus: 6
         phone: phone
         id: 0
+        userType: ""
         email: email
         username: username
       properties:
@@ -1505,9 +1506,18 @@ components:
           description: User Status
           format: int32
           type: integer
+        userType:
+          allOf:
+          - $ref: '#/components/schemas/UserType'
       type: object
       xml:
         name: User
+    UserType:
+      enum:
+      - admin
+      - user
+      title: UserType
+      type: string
     Tag:
       example:
         name: name

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/User.java

@@ -22,6 +22,11 @@ import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.client.model.UserType;
+import org.openapitools.jackson.nullable.JsonNullable;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import org.openapitools.jackson.nullable.JsonNullable;
+import java.util.NoSuchElementException;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 
@@ -36,7 +41,8 @@ import com.fasterxml.jackson.annotation.JsonTypeName;
   User.JSON_PROPERTY_EMAIL,
   User.JSON_PROPERTY_PASSWORD,
   User.JSON_PROPERTY_PHONE,
-  User.JSON_PROPERTY_USER_STATUS
+  User.JSON_PROPERTY_USER_STATUS,
+  User.JSON_PROPERTY_USER_TYPE
 })
 @javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen")
 public class User {
@@ -64,6 +70,9 @@ public class User {
   public static final String JSON_PROPERTY_USER_STATUS = "userStatus";
   private Integer userStatus;
 
+  public static final String JSON_PROPERTY_USER_TYPE = "userType";
+  private JsonNullable<UserType> userType = JsonNullable.<UserType>undefined();
+
   public User() { 
   }
 
@@ -283,6 +292,41 @@ public class User {
   }
 
 
+  public User userType(UserType userType) {
+    this.userType = JsonNullable.<UserType>of(userType);
+    
+    return this;
+  }
+
+   /**
+   * Get userType
+   * @return userType
+  **/
+  @javax.annotation.Nullable
+  @ApiModelProperty(value = "")
+  @JsonIgnore
+
+  public UserType getUserType() {
+        return userType.orElse(null);
+  }
+
+  @JsonProperty(JSON_PROPERTY_USER_TYPE)
+  @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
+
+  public JsonNullable<UserType> getUserType_JsonNullable() {
+    return userType;
+  }
+  
+  @JsonProperty(JSON_PROPERTY_USER_TYPE)
+  public void setUserType_JsonNullable(JsonNullable<UserType> userType) {
+    this.userType = userType;
+  }
+
+  public void setUserType(UserType userType) {
+    this.userType = JsonNullable.<UserType>of(userType);
+  }
+
+
   @Override
   public boolean equals(Object o) {
     if (this == o) {
@@ -299,12 +343,24 @@ public class User {
         Objects.equals(this.email, user.email) &&
         Objects.equals(this.password, user.password) &&
         Objects.equals(this.phone, user.phone) &&
-        Objects.equals(this.userStatus, user.userStatus);
+        Objects.equals(this.userStatus, user.userStatus) &&
+        equalsNullable(this.userType, user.userType);
+  }
+
+  private static <T> boolean equalsNullable(JsonNullable<T> a, JsonNullable<T> b) {
+    return a == b || (a != null && b != null && a.isPresent() && b.isPresent() && Objects.deepEquals(a.get(), b.get()));
   }
 
   @Override
   public int hashCode() {
-    return Objects.hash(id, username, firstName, lastName, email, password, phone, userStatus);
+    return Objects.hash(id, username, firstName, lastName, email, password, phone, userStatus, hashCodeNullable(userType));
+  }
+
+  private static <T> int hashCodeNullable(JsonNullable<T> a) {
+    if (a == null) {
+      return 1;
+    }
+    return a.isPresent() ? Arrays.deepHashCode(new Object[]{a.get()}) : 31;
   }
 
   @Override
@@ -319,6 +375,7 @@ public class User {
     sb.append("    password: ").append(toIndentedString(password)).append("\n");
     sb.append("    phone: ").append(toIndentedString(phone)).append("\n");
     sb.append("    userStatus: ").append(toIndentedString(userStatus)).append("\n");
+    sb.append("    userType: ").append(toIndentedString(userType)).append("\n");
     sb.append("}");
     return sb.toString();
   }

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/UserType.java

@@ -0,0 +1,59 @@
+/*
+ * OpenAPI Petstore
+ * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+
+package org.openapitools.client.model;
+
+import java.util.Objects;
+import java.util.Arrays;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonValue;
+
+/**
+ * Gets or Sets UserType
+ */
+public enum UserType {
+  
+  ADMIN("admin"),
+  
+  USER("user");
+
+  private String value;
+
+  UserType(String value) {
+    this.value = value;
+  }
+
+  @JsonValue
+  public String getValue() {
+    return value;
+  }
+
+  @Override
+  public String toString() {
+    return String.valueOf(value);
+  }
+
+  @JsonCreator
+  public static UserType fromValue(String value) {
+    for (UserType b : UserType.values()) {
+      if (b.value.equals(value)) {
+        return b;
+      }
+    }
+    throw new IllegalArgumentException("Unexpected value '" + value + "'");
+  }
+}
+

samples/client/petstore/java/feign/src/test/java/org/openapitools/client/model/UserTypeTest.java

@@ -0,0 +1,31 @@
+/*
+ * OpenAPI Petstore
+ * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+
+package org.openapitools.client.model;
+
+import org.junit.jupiter.api.Test;
+
+
+/**
+ * Model tests for UserType
+ */
+class UserTypeTest {
+    /**
+     * Model tests for UserType
+     */
+    @Test
+    void testUserType() {
+        // TODO: test UserType
+    }
+
+}