CODEWITHSUNDEEP
c#entity-frameworkasp.net-web-apione-to-manyrelationship
Renan Marcel
Renan Marcel

Reputation: 33

entity framework Code First One-to-Many relationships in Web.API

I'm trying to create a one to many relationship using entity framework to convert the json object using Web.API return.

I am creating a scenario that a User has many features emails.

However json file in the User entity that brings contains a list of Emails that appear always empty.

User Entity

[DataContract]
public class UsuarioEntity : BaseEntity
{
    [DataMember]
    public string UserName { get; set; }

    [DataMember]
    public string Password { get; set; }

    [DataMember]
    public bool Ativado { get; set; } 

    [DataMember] 
    public ICollection<EmailEntity> Emails { get; private set; }
}

Email Entity

 [DataContract]
public class EmailEntity : BaseEntity
{

    [DataMember]
    public string Email { get; set; }

    [DataMember]
    public bool Ativo { get; set; }

    [DataMember]
    public bool Principal { get; set; }

    [DataMember]
    public DateTime DataCadastro { get; set; }

    [DataMember]
    public UsuarioEntity Usuario { get; set; }

}

Fluent API

UsuarioConfiguration

            ToTable("tbl_usuarios");

        HasKey(a => new {a.Id, a.UserName});

        Property(a => a.Id)
            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity)
            .HasColumnName("cd_id_usuario");

        Property(a => a.UserName)
            .HasMaxLength(32)
            .HasColumnName("nm_usuario");

        Property(a => a.Password)
            .IsRequired()
            .HasMaxLength(32)
            .HasColumnName("tx_senha");

        Property(a => a.DataCadastro) 
            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Computed)
            .HasColumnType("datetime")
            .IsRequired()
            .HasColumnName("dt_cadastro");

        HasMany(o => o.Emails)
            .WithRequired();

EmailConfiguration

            ToTable("tbl_email_usuario");

        HasKey(a => new { a.Id, a.Email });

        Property(a => a.Id)
            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity)
            .HasColumnName("cd_id_email");

        Property(a => a.Email)
            .HasMaxLength(150)
            .HasColumnName("nm_email");

        Property(a => a.DataCadastro)
            .HasColumnType("datetime")
            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Computed)
            .IsRequired()
            .HasColumnName("dt_cadastro")

I tried to use EF with Web api this way:

public IQueryable<UsuarioEntity> Get()
{
    PlainContext context = new PlainContext();
    return context.Usuarios;
}

Except that the return was not expected

[{"Id":1,"Ativado":true,"DataCadastro":"\/Date(1357307720730-0200)\/","Emails":[],"Password":"senha456","UserName":"recapix"}]

I own and Registered Emails only they do not appear on Json.

Upvotes: 2

Views: 3228

Answers (1)

Ladislav Mrnka
Ladislav Mrnka

Reputation: 364409

Your entities don't support lazy loading so you must define explicitly that you want to load related emails as well:

return context.Usarios.Include(u => u.Emails);

Upvotes: 1

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