* limitations under the License.
 */

package gradlebuild.binarycompatibility.rules;

import japicmp.model.JApiClass;
import japicmp.model.JApiCompatibility;
import japicmp.model.JApiConstructor;
import japicmp.model.JApiField;
import japicmp.model.JApiHasAnnotations;
import japicmp.model.JApiMethod;
import me.champeau.gradle.japicmp.report.Violation;

import java.util.Map;

	})

	var count1 int64
	if err := DB.Model(&Company{}).Where("name = ?", "company_count_group_a").Group("name").Count(&count1).Error; err != nil {
		t.Errorf("Count should work, but got err %v", err)
	}
	if count1 != 1 {
		t.Errorf("Count with group should be 1, but got count: %v", count1)
	}

	var count2 int64

	// Clear
	DB.Model(&users).Association("Company").Clear()
	AssertAssociationCount(t, users, "Company", 0, "After Clear")

	DB.Model(&users).Association("Manager").Clear()
	AssertAssociationCount(t, users, "Manager", 0, "After Clear")

	// shared company
	company := Company{Name: "shared"}
	if err := DB.Model(&users[0]).Association("Company").Append(&company); err != nil {

Quando você cria uma *operação de rota* no **FastAPI**, normalmente você pode retornar qualquer dado: um `dict`, uma `list`, um modelo do Pydantic, um modelo do banco de dados, etc.

Se você declarar um [Modelo de resposta](../tutorial/response-model.md), o FastAPI irá usá-lo para serializar os dados para JSON, usando o Pydantic.

	var name string
	var total int
	if err := DB.Model(&User{}).Select("name, sum(age)").Where("name = ?", "groupby").Group("name").Row().Scan(&name, &total); err != nil {
		t.Errorf("no error should happen, but got %v", err)
	}

	if name != "groupby" || total != 60 {
		t.Errorf("name should be groupby, but got %v, total should be 60, but got %v", name, total)
	}

Pydantic açısından, alanları (field) Pydantic v1 modelleriyle tanımlanmış bir Pydantic v2 modeli (ya da tersi) kullanmak **desteklenmez**.

```mermaid
graph TB
    subgraph "❌ Not Supported"
        direction TB
        subgraph V2["Pydantic v2 Model"]
            V1Field["Pydantic v1 Model"]
        end
        subgraph V1["Pydantic v1 Model"]
            V2Field["Pydantic v2 Model"]
        end
    end

    style V2 fill:#f9fff3

import gradlebuild.binarycompatibility.sources.SinceTagStatus;
import japicmp.model.JApiClass;
import japicmp.model.JApiCompatibility;
import japicmp.model.JApiConstructor;
import japicmp.model.JApiField;
import japicmp.model.JApiHasAnnotations;
import japicmp.model.JApiMethod;
import me.champeau.gradle.japicmp.report.Violation;

import java.util.Map;

import static japicmp.model.JApiCompatibilityChangeType.METHOD_ADDED_TO_INTERFACE;
import static japicmp.model.JApiCompatibilityChangeType.METHOD_ADDED_TO_PUBLIC_CLASS;
import static japicmp.model.JApiCompatibilityChangeType.METHOD_NEW_DEFAULT;
import static japicmp.model.JApiCompatibilityChangeType.METHOD_REMOVED;
import static japicmp.model.JApiCompatibilityChangeType.METHOD_RETURN_TYPE_CHANGED;

import com.google.common.collect.ImmutableList;
import japicmp.model.JApiClass;
import japicmp.model.JApiCompatibility;
import japicmp.model.JApiCompatibilityChange;
import japicmp.model.JApiCompatibilityChangeType;
import japicmp.model.JApiConstructor;
import japicmp.model.JApiHasAnnotations;
import japicmp.model.JApiImplementedInterface;
import me.champeau.gradle.japicmp.report.Violation;

Döndürmeniz gerekenden daha fazla veri döndürmediğinizden emin olmak için, [Tutorial - Response Model - Return Type](../tutorial/response-model.md) dokümantasyonunu okuyun.

## Response Performansını Optimize Etme - Response Model - Return Type { #optimize-response-performance-response-model-return-type }