private static bool IsIdentifyingPrincipal(IEntityType dependEntityType, IEntityType principalEntityType)
{
var identifyingForeignKeys = new Queue <IForeignKey>(
dependEntityType.FindForeignKeys(dependEntityType.FindPrimaryKey().Properties));
while (identifyingForeignKeys.Count > 0)
{
var fk = identifyingForeignKeys.Dequeue();
if (fk.PrincipalKey.IsPrimaryKey())
{
if (fk.PrincipalEntityType == principalEntityType)
{
if (principalEntityType.BaseType != null)
{
// #8973
throw new InvalidOperationException(
RelationalStrings.IncompatibleTableDerivedPrincipal(
dependEntityType.Relational().TableName,
dependEntityType.DisplayName(),
principalEntityType.DisplayName(),
principalEntityType.RootType().DisplayName()));
}
return(true);
}
foreach (var principalFk in fk.PrincipalEntityType.FindForeignKeys(fk.PrincipalEntityType.FindPrimaryKey().Properties))
{
identifyingForeignKeys.Enqueue(principalFk);
}
}
}
return(false);
}
private static bool IsIdentifyingPrincipal(IEntityType dependEntityType, IEntityType principalEntityType)
{
foreach (var foreignKey in dependEntityType.FindForeignKeys(dependEntityType.FindPrimaryKey().Properties))
{
if (!foreignKey.PrincipalKey.IsPrimaryKey() ||
foreignKey.PrincipalEntityType != principalEntityType)
{
continue;
}
if (principalEntityType.BaseType != null)
{
// #8973
throw new InvalidOperationException(
RelationalStrings.IncompatibleTableDerivedPrincipal(
dependEntityType.Relational().TableName,
dependEntityType.DisplayName(),
principalEntityType.DisplayName(),
principalEntityType.RootType().DisplayName()));
}
return(true);
}
return(false);
}
private static bool IsIdentifyingPrincipal(IEntityType dependentEntityType, IEntityType principalEntityType)
{
return dependentEntityType.FindForeignKeys(dependentEntityType.FindPrimaryKey().Properties)
.Any(
fk => fk.PrincipalKey.IsPrimaryKey()
&& fk.PrincipalEntityType == principalEntityType);
}
private static Expression GenerateSharedTableExpression(
IEntityType entityType, HashSet <IEntityType> sharingTypes, SelectExpression selectExpression, IQuerySource querySource)
{
if (sharingTypes.Count == 1 ||
!entityType.FindForeignKeys(entityType.FindPrimaryKey().Properties)
.Any(fk => fk.PrincipalKey.IsPrimaryKey() &&
fk.PrincipalEntityType != entityType &&
sharingTypes.Contains(fk.PrincipalEntityType)))
{
return(null);
}
var requiredNonPkProperties = entityType.GetProperties().Where(p => !p.IsNullable && !p.IsPrimaryKey()).ToList();
if (requiredNonPkProperties.Count > 0)
{
var discriminatorPredicate
= IsNotNull(requiredNonPkProperties[0], selectExpression, querySource);
if (requiredNonPkProperties.Count > 1)
{
discriminatorPredicate
= requiredNonPkProperties
.Skip(1)
.Aggregate(
discriminatorPredicate, (current, property) =>
Expression.AndAlso(
IsNotNull(property, selectExpression, querySource),
current));
}
return(discriminatorPredicate);
}
else
{
var allNonPkProperties = entityType.GetProperties().Where(p => !p.IsPrimaryKey()).ToList();
if (allNonPkProperties.Count == 0)
{
return(null);
}
var discriminatorPredicate
= IsNotNull(allNonPkProperties[0], selectExpression, querySource);
if (allNonPkProperties.Count > 1)
{
discriminatorPredicate
= allNonPkProperties
.Skip(1)
.Aggregate(
discriminatorPredicate, (current, property) =>
Expression.OrElse(
IsNotNull(property, selectExpression, querySource),
current));
}
return(discriminatorPredicate);
}
}
private void FindPaths(IEntityType entityType, HashSet <IEntityType> sharedTypes,
Stack <IEntityType> currentPath, List <List <IEntityType> > result)
{
var identifyingFks = entityType.FindForeignKeys(entityType.FindPrimaryKey().Properties)
.Where(fk => fk.PrincipalKey.IsPrimaryKey() &&
fk.PrincipalEntityType != entityType &&
sharedTypes.Contains(fk.PrincipalEntityType))
.ToList();
if (identifyingFks.Count == 0)
{
result.Add(new List <IEntityType>(currentPath));
return;
}
foreach (var fk in identifyingFks)
{
currentPath.Push(fk.PrincipalEntityType);
FindPaths(fk.PrincipalEntityType.RootType(), sharedTypes, currentPath, result);
currentPath.Pop();
}
}
/// <summary>
/// Gets the foreign keys defined on the given property. Only foreign keys that are defined on exactly the specified
/// property are returned. Composite foreign keys that include the specified property are not returned.
/// </summary>
/// <param name="entityType"> The entity type to find the foreign keys on. </param>
/// <param name="property"> The property to find the foreign keys on. </param>
/// <returns> The foreign keys. </returns>
public static IEnumerable <IForeignKey> FindForeignKeys([NotNull] this IEntityType entityType, [NotNull] IProperty property)
=> entityType.FindForeignKeys(new[] { property });