/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual InternalNavigationBuilder IsRequired(bool?required, ConfigurationSource configurationSource)
{
if (configurationSource == ConfigurationSource.Explicit ||
CanSetIsRequired(required, configurationSource))
{
var foreignKey = Metadata.ForeignKey;
if (foreignKey.IsUnique)
{
if (foreignKey.GetPrincipalEndConfigurationSource() == null)
{
throw new InvalidOperationException(
CoreStrings.AmbiguousEndRequiredDependentNavigation(
Metadata.DeclaringEntityType.DisplayName(),
Metadata.Name,
foreignKey.Properties.Format()));
}
return(Metadata.IsOnDependent
? foreignKey.Builder.IsRequired(required, configurationSource)
.Metadata.DependentToPrincipal.Builder
: foreignKey.Builder.IsRequiredDependent(required, configurationSource)
.Metadata.PrincipalToDependent.Builder);
}
else
{
if (Metadata.IsOnDependent)
{
return(foreignKey.Builder.IsRequired(required, configurationSource)
.Metadata.DependentToPrincipal.Builder);
}
else
{
throw new InvalidOperationException(
CoreStrings.NonUniqueRequiredDependentNavigation(
foreignKey.PrincipalEntityType.DisplayName(), Metadata.Name));
}
}
}
return(null);
}