/// <summary>
/// Called after a navigation property that has an attribute is added to an entity type.
/// </summary>
/// <param name="relationshipBuilder"> The builder for the relationship. </param>
/// <param name="navigation"> The navigation. </param>
/// <param name="attribute"> The attribute. </param>
/// <param name="context"> Additional information associated with convention execution. </param>
public override void ProcessNavigationAdded(
IConventionRelationshipBuilder relationshipBuilder,
IConventionNavigation navigation,
InversePropertyAttribute attribute,
IConventionContext <IConventionNavigation> context)
{
if (relationshipBuilder.Metadata.DeclaringEntityType.HasDefiningNavigation() ||
relationshipBuilder.Metadata.DeclaringEntityType.IsOwned() ||
relationshipBuilder.Metadata.PrincipalEntityType.HasDefiningNavigation() ||
relationshipBuilder.Metadata.PrincipalEntityType.IsOwned())
{
return;
}
var newRelationship = ConfigureInverseNavigation(
navigation.DeclaringEntityType.Builder,
navigation.GetIdentifyingMemberInfo(),
navigation.GetTargetType().Builder,
attribute);
if (newRelationship != relationshipBuilder)
{
if (newRelationship == null)
{
context.StopProcessingIfChanged(null);
return;
}
var newNavigation = navigation.IsDependentToPrincipal()
? newRelationship.Metadata.DependentToPrincipal
: newRelationship.Metadata.PrincipalToDependent;
context.StopProcessingIfChanged(newNavigation);
}
}
/// <summary>
/// Returns the attributes applied to the given navigation.
/// </summary>
/// <param name="entityType"> The entity type. </param>
/// <param name="navigation"> The navigation. </param>
/// <typeparam name="TCustomAttribute"> The attribute type to look for. </typeparam>
/// <returns> The attributes applied to the given navigation. </returns>
protected static IEnumerable <TCustomAttribute> GetAttributes <TCustomAttribute>(
[NotNull] IConventionEntityType entityType, [NotNull] IConventionNavigation navigation)
where TCustomAttribute : Attribute
{
var memberInfo = navigation.GetIdentifyingMemberInfo();
if (!entityType.HasClrType() ||
memberInfo == null)
{
return(Enumerable.Empty <TCustomAttribute>());
}
return(Attribute.IsDefined(memberInfo, typeof(TCustomAttribute), inherit: true)
? memberInfo.GetCustomAttributes <TCustomAttribute>(true)
: Enumerable.Empty <TCustomAttribute>());
}
private static InversePropertyAttribute?GetInversePropertyAttribute(IConventionNavigation navigation) => GetAttribute <InversePropertyAttribute>(navigation.GetIdentifyingMemberInfo());
private static ForeignKeyAttribute GetForeignKeyAttribute(IConventionNavigation navigation) => GetAttribute <ForeignKeyAttribute>(navigation.GetIdentifyingMemberInfo());
/// <summary>
/// Returns the attributes applied to the given navigation.
/// </summary>
/// <param name="entityType"> The entity type. </param>
/// <param name="navigation"> The navigation. </param>
/// <typeparam name="TCustomAttribute"> The attribute type to look for. </typeparam>
/// <returns> The attributes applied to the given navigation. </returns>
protected static IEnumerable<TCustomAttribute> GetAttributes<TCustomAttribute>(
[NotNull] IConventionEntityType entityType, [NotNull] IConventionNavigation navigation)
where TCustomAttribute : Attribute
=> GetAttributes<TCustomAttribute>(entityType, navigation.GetIdentifyingMemberInfo());