/// <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>
protected virtual IConventionIndex CreateIndex(
[NotNull] IReadOnlyList <IConventionProperty> properties, bool unique, [NotNull] IConventionEntityTypeBuilder entityTypeBuilder)
{
foreach (var key in entityTypeBuilder.Metadata.GetKeys())
{
if (AreIndexedBy(properties, unique, key.Properties, coveringIndexUnique: true))
{
return(null);
}
}
foreach (var existingIndex in entityTypeBuilder.Metadata.GetIndexes())
{
if (AreIndexedBy(properties, unique, existingIndex.Properties, existingIndex.IsUnique))
{
return(null);
}
}
var indexBuilder = entityTypeBuilder.HasIndex(properties);
if (unique)
{
indexBuilder?.IsUnique(true);
}
return(indexBuilder?.Metadata);
}
