protected virtual void TryConfigurePrimaryKey([NotNull] IConventionEntityTypeBuilder entityTypeBuilder)
{
var entityType = entityTypeBuilder.Metadata;
if (entityType.BaseType != null ||
(entityType.IsKeyless && entityType.GetIsKeylessConfigurationSource() != ConfigurationSource.Convention) ||
!entityTypeBuilder.CanSetPrimaryKey(null))
{
return;
}
List <IConventionProperty>?keyProperties = null;
var ownership = entityType.FindOwnership();
if (ownership != null &&
ownership.DeclaringEntityType != entityType)
{
ownership = null;
}
if (ownership?.IsUnique == true)
{
keyProperties = ownership.Properties.ToList();
}
if (keyProperties == null)
{
var candidateProperties = entityType.GetProperties().Where(
p => !p.IsImplicitlyCreated() ||
!ConfigurationSource.Convention.Overrides(p.GetConfigurationSource()));
keyProperties = DiscoverKeyProperties(entityType, candidateProperties).ToList();
if (keyProperties.Count > 1)
{
Dependencies.Logger.MultiplePrimaryKeyCandidates(keyProperties[0], keyProperties[1]);
return;
}
}
if (ownership?.IsUnique == false)
{
if (keyProperties.Count == 0 ||
ownership.Properties.Contains(keyProperties.First()))
{
var primaryKey = entityType.FindPrimaryKey();
var shadowProperty = primaryKey?.Properties.Last();
if (shadowProperty == null ||
primaryKey !.Properties.Count == 1 ||
ownership.Properties.Contains(shadowProperty))
{
shadowProperty = entityTypeBuilder.CreateUniqueProperty(typeof(int), "Id", required: true) !.Metadata;
}
keyProperties.Clear();
keyProperties.Add(shadowProperty);
}
var extraProperty = keyProperties[0];
keyProperties.RemoveAt(0);
keyProperties.AddRange(ownership.Properties);
keyProperties.Add(extraProperty);
}
if (keyProperties.Count == 0)
{
var manyToManyForeignKeys = entityType.GetForeignKeys()
.Where(fk => fk.GetReferencingSkipNavigations().Any(n => n.IsCollection)).ToList();
if (manyToManyForeignKeys.Count == 2 &&
!manyToManyForeignKeys.Any(fk => fk.PrincipalEntityType == entityType))
{
keyProperties.AddRange(manyToManyForeignKeys.SelectMany(fk => fk.Properties));
}
}
for (var i = keyProperties.Count - 1; i >= 0; i--)
{
var property = keyProperties[i];
for (var j = i - 1; j >= 0; j--)
{
if (property == keyProperties[j])
{
keyProperties.RemoveAt(j);
i--;
}
}
}
ProcessKeyProperties(keyProperties, entityType);
if (keyProperties.Count > 0)
{
entityTypeBuilder.PrimaryKey(keyProperties);
}
}
/// <summary>
/// Discovers primary key candidates and configures the primary key if found.
/// </summary>
/// <param name="entityTypeBuilder"> The entity type builder. </param>
protected virtual void TryConfigurePrimaryKey([NotNull] IConventionEntityTypeBuilder entityTypeBuilder)
{
var entityType = entityTypeBuilder.Metadata;
if (entityType.BaseType != null ||
(entityType.IsKeyless && entityType.GetIsKeylessConfigurationSource() != ConfigurationSource.Convention) ||
!entityTypeBuilder.CanSetPrimaryKey(null))
{
return;
}
List <IConventionProperty> 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()));
keyProperties = DiscoverKeyProperties(entityType, candidateProperties).ToList();
if (keyProperties.Count > 1)
{
Dependencies.Logger.MultiplePrimaryKeyCandidates(keyProperties[0], keyProperties[1]);
return;
}
}
if (definingFk?.IsUnique == false)
{
if (keyProperties.Count == 0 ||
definingFk.Properties.Contains(keyProperties.First()))
{
var primaryKey = entityType.FindPrimaryKey();
var shadowProperty = primaryKey?.Properties.Last();
if (shadowProperty == null ||
primaryKey.Properties.Count == 1 ||
definingFk.Properties.Contains(shadowProperty))
{
shadowProperty = ((InternalEntityTypeBuilder)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);
}
ProcessKeyProperties(keyProperties, entityType);
if (keyProperties.Count > 0)
{
entityTypeBuilder.PrimaryKey(keyProperties);
}
}