# 7.1.5 Configurar el servicio OData y llaves foráneas

En nuestra misma clase **startup** en el método **ConfigureServices** agregamos los servicios **OData**

{% code title="Startup.cs" %}

```csharp
public void ConfigureServices(IServiceCollection services)
{
    services.AddOData();
```

{% endcode %}

Creamos nuestras llaves foráneas e índices

{% code title="ClienteCategoriaConfiguration.cs" %}

```csharp
public class ClienteCategoriaConfiguration 
                : IEntityTypeConfiguration<ClientesCategorias>
{
    /// <summary>
    /// LLaves e índices para guardar las categorías por cliente
    /// </summary>
    /// <param name="builder"></param>
    public void Configure(EntityTypeBuilder<ClientesCategorias> builder)
    {
        builder.HasOne(c => c.Categoria)
                    .WithMany(cc=>cc.ClienteCategoria)
                    .OnDelete(DeleteBehavior.Restrict);

         builder.HasOne(e => e.Cliente)
                .WithMany(c => c.ClienteCategoria)
                .OnDelete(DeleteBehavior.Restrict);

         builder.HasIndex(e => new { e.ClienteId, e.CategoriaId })
               .HasName("UI_ClienteCategoria")
               .IsUnique();
     }
}
```

{% endcode %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://abi.gitbook.io/net-core/6.2-configurar-tus-servicios-con-odata/6.2.5-configurar-el-servicio-odata.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.