}

// ParseUniqueConstraints parse schema unique constraints
func (schema *Schema) ParseUniqueConstraints() map[string]UniqueConstraint {
	uniques := make(map[string]UniqueConstraint)
	for _, field := range schema.Fields {
		if field.Unique {
			name := schema.namer.UniqueName(schema.Table, field.DBName)
			uniques[name] = UniqueConstraint{Name: name, Field: field}
		}
	}

                                    "content": {"application/json": {"schema": {}}},
                                },
                                "422": {
                                    "description": "Validation Error",
                                    "content": {
                                        "application/json": {
                                            "schema": {

                    "post": {
                        "summary": "Schema Extra",
                        "operationId": "schema_extra_schema_extra__post",
                        "requestBody": {
                            "content": {
                                "application/json": {
                                    "schema": {"$ref": "#/components/schemas/Item"}
                                }
                            },

Esta definição de *schema* inclui os paths da sua API, os parâmetros possíveis que eles usam, etc.

#### "*Schema*" de dados { #data-schema }

O termo "*schema*" também pode se referir à forma de alguns dados, como um conteúdo JSON.

Nesse caso, significaria os atributos JSON e os tipos de dados que eles possuem, etc.

#### OpenAPI e JSON Schema { #openapi-and-json-schema }

                                "content": {"application/json": {"schema": {}}},
                            },
                            "422": {
                                "description": "Validation Error",
                                "content": {
                                    "application/json": {
                                        "schema": {

                                "content": {"application/json": {"schema": {}}},
                            },
                            "422": {
                                "description": "Validation Error",
                                "content": {
                                    "application/json": {
                                        "schema": {

			relation.Type = HasMany
		}
	}

	if schema.err == nil {
		schema.setRelation(relation)
		switch relation.Type {
		case HasOne:
			schema.Relationships.HasOne = append(schema.Relationships.HasOne, relation)
		case HasMany:
			schema.Relationships.HasMany = append(schema.Relationships.HasMany, relation)
		case BelongsTo:
			schema.Relationships.BelongsTo = append(schema.Relationships.BelongsTo, relation)
		case Many2Many:

			if r.Name != relation.Name {
				t.Errorf("schema %v relation name expects %v, but got %v", s, r.Name, relation.Name)
			}

			if r.Type != relation.Type {
				t.Errorf("schema %v relation name expects %v, but got %v", s, r.Type, relation.Type)
			}

			if r.Schema.Name != relation.Schema {
				t.Errorf("schema %v relation's schema expects %v, but got %v", s, relation.Schema, r.Schema.Name)
			}

### 文档中输入/输出使用同一 Schema 的模型 { #same-schema-for-input-and-output-models-in-docs }

现在该模型的输入和输出将只使用一个 schema，即 `Item`，并且其中的 `description` **不是必填**：

<div class="screenshot">
<img src="/img/tutorial/separate-openapi-schemas/image05.png">

                                "content": {"application/json": {"schema": {}}},
                            },
                            "422": {
                                "description": "Validation Error",
                                "content": {
                                    "application/json": {
                                        "schema": {