static ManyToManyTableMetadata BuildTableMetadata(InternalRelationshipBuilder relationshipBuilder, Navigation tableNavigation, Type collectionType)
{
EntityType parentEntityType = relationshipBuilder.Metadata.PrincipalEntityType;
// get the clr type of the intermediate entity.
EntityType tableEntityType = tableNavigation.GetTargetType();
InternalEntityTypeBuilder tableBuilder = relationshipBuilder.ModelBuilder.Entity(tableEntityType.ClrType, ConfigurationSource.DataAnnotation, true);
// metadata for the intermediate table.
IEnumerable <Navigation> tableNavigations = tableEntityType.GetNavigations();
Navigation end1Navigation = tableNavigations.Single(p => p.ClrType == parentEntityType.ClrType);
Navigation end2Navigation = tableNavigations.Single(p => p.ClrType == collectionType);
tableNavigation.Owned(ConfigurationSource.DataAnnotation);
end1Navigation.Associated(ConfigurationSource.DataAnnotation);
end2Navigation.Associated(ConfigurationSource.DataAnnotation);
// if there is no FK, build one.
if (tableEntityType.FindPrimaryKey() == null)
{
List <string> pkProps = tableEntityType.GetForeignKeys()
.Where(fk => fk.PrincipalEntityType == parentEntityType || fk.PrincipalEntityType.ClrType == collectionType)
.OrderBy(fk => fk.PrincipalEntityType != parentEntityType)
.SelectMany(fk => fk.Properties)
.Select(p => p.Name)
.ToList();
tableBuilder.PrimaryKey(pkProps, ConfigurationSource.Explicit);
}
return(new ManyToManyTableMetadata
{
Getter = tableNavigation.Getter,
Setter = tableNavigation.Setter,
End1Getter = end1Navigation.GetGetter(),
End1Setter = end1Navigation.GetSetter(),
End2Getter = end2Navigation.GetGetter(),
End2Setter = end2Navigation.GetSetter(),
ItemType = tableEntityType.ClrType
});
}
