/// <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 InternalEntityTypeBuilder Apply(InternalEntityTypeBuilder entityTypeBuilder)
{
Check.NotNull(entityTypeBuilder, nameof(entityTypeBuilder));
var entityType = entityTypeBuilder.Metadata;
if (entityType.BaseType != null ||
entityType.IsKeyless ||
!ConfigurationSource.Convention.Overrides(entityType.GetPrimaryKeyConfigurationSource()))
{
return(entityTypeBuilder);
}
List <Property> keyProperties = null;
var definingFk = entityType.FindDefiningNavigation()?.ForeignKey
?? entityType.FindOwnership();
if (definingFk != null &&
definingFk.DeclaringEntityType != entityType)
{
definingFk = null;
}
if (definingFk?.IsUnique == true)
{
keyProperties = definingFk.Properties.ToList();
}
if (keyProperties == null)
{
var candidateProperties = entityType.GetProperties().Where(
p => !p.IsShadowProperty() ||
!ConfigurationSource.Convention.Overrides(p.GetConfigurationSource())).ToList();
keyProperties = (List <Property>)DiscoverKeyProperties(entityType, candidateProperties);
if (keyProperties.Count > 1)
{
Logger?.MultiplePrimaryKeyCandidates(keyProperties[0], keyProperties[1]);
return(entityTypeBuilder);
}
}
if (definingFk?.IsUnique == false)
{
if (keyProperties.Count == 0 ||
definingFk.Properties.Contains(keyProperties.First()))
{
var shadowProperty = entityType.FindPrimaryKey()?.Properties.Last();
if (shadowProperty == null ||
entityType.FindPrimaryKey().Properties.Count == 1 ||
definingFk.Properties.Contains(shadowProperty))
{
shadowProperty = entityTypeBuilder.CreateUniqueProperty("Id", typeof(int), isRequired: true);
}
keyProperties.Clear();
keyProperties.Add(shadowProperty);
}
var extraProperty = keyProperties[0];
keyProperties.RemoveAt(0);
keyProperties.AddRange(definingFk.Properties);
keyProperties.Add(extraProperty);
}
if (keyProperties.Count > 0)
{
entityTypeBuilder.PrimaryKey(keyProperties, ConfigurationSource.Convention);
}
return(entityTypeBuilder);
}
