/// <summary>
/// Retrieves the dependent end of this association, given the following rules in order of priority:
/// 1. If there is a referential constraint defined on the association, this returns the DependentEnd.
/// 2. If the association's multiplicity is 1:1 and OnDelete='Cascade' is defined on the first end, then this returns the second end.
/// If OnDelete='Cascade' is not defined on the first end, this returns the first end.
/// 3. In a 1:* or 0..1:* association, this returns the end with the * multiplicity.
/// 4. In a 0..1:1 association, this returns the end with the 0..1 multiplicity.
/// </summary>
/// <param name="association">The association.</param>
/// <returns>The dependent end.</returns>
/// <exception cref="InvalidOperationException">if this association is *:*</exception>
public static AssociationEndMember GetDependentEnd(this AssociationType association)
{
Debug.Assert(false == association.IsManyToMany(), Resources.ErrorGetDependentEndOnManyToMany);
if (association.IsManyToMany())
{
throw new InvalidOperationException(Resources.ErrorGetDependentEndOnManyToMany);
}
if (association.ReferentialConstraints.Count > 0)
{
return(association.ReferentialConstraints.FirstOrDefault().ToRole as AssociationEndMember);
}
else
{
// Dependency is implied by OnDelete in 1:1 associations
if (association.GetEnd1().RelationshipMultiplicity == RelationshipMultiplicity.One &&
association.GetEnd2().RelationshipMultiplicity == RelationshipMultiplicity.One)
{
return(association.GetEnd1().GetOnDelete() == OperationAction.Cascade ? association.GetEnd2() : association.GetEnd1());
}
// Dependency can also be implied by the multiplicity of the association
if ((association.GetEnd1().RelationshipMultiplicity == RelationshipMultiplicity.Many)
||
(association.GetEnd1().RelationshipMultiplicity == RelationshipMultiplicity.ZeroOrOne &&
association.GetEnd2().RelationshipMultiplicity == RelationshipMultiplicity.One))
{
return(association.GetEnd1());
}
return(association.GetEnd2());
}
}
private static IEnumerable <Tuple <ModificationFunctionMemberPath, EdmProperty> > GetIndependentFkColumns(
EntityType entityType,
DbDatabaseMapping databaseMapping)
{
foreach (AssociationSetMapping associationSetMapping in databaseMapping.GetAssociationSetMappings())
{
AssociationType associationType = associationSetMapping.AssociationSet.ElementType;
if (!associationType.IsManyToMany())
{
AssociationEndMember _;
AssociationEndMember dependentEnd;
if (!associationType.TryGuessPrincipalAndDependentEnds(out _, out dependentEnd))
{
dependentEnd = associationType.TargetEnd;
}
EntityType dependentEntityType = dependentEnd.GetEntityType();
if (dependentEntityType == entityType || ModificationFunctionMappingGenerator.GetParents(entityType).Contains <EntityType>(dependentEntityType))
{
EndPropertyMapping endPropertyMapping = associationSetMapping.TargetEndMapping.AssociationEnd != dependentEnd ? associationSetMapping.TargetEndMapping : associationSetMapping.SourceEndMapping;
foreach (ScalarPropertyMapping propertyMapping in endPropertyMapping.PropertyMappings)
{
yield return(Tuple.Create <ModificationFunctionMemberPath, EdmProperty>(new ModificationFunctionMemberPath((IEnumerable <EdmMember>) new EdmMember[2]
{
(EdmMember)propertyMapping.Property,
(EdmMember)dependentEnd
}, associationSetMapping.AssociationSet), propertyMapping.Column));
}
}
}
}
}
public void IsManyToMany_should_be_true_when_source_many_and_target_many()
{
var associationType = new AssociationType("A", XmlConstants.ModelNamespace_3, false, DataSpace.CSpace);
associationType.SourceEnd = new AssociationEndMember("S", new EntityType("E", "N", DataSpace.CSpace));
associationType.TargetEnd = new AssociationEndMember("T", new EntityType("E", "N", DataSpace.CSpace));
associationType.SourceEnd.RelationshipMultiplicity = RelationshipMultiplicity.Many;
associationType.TargetEnd.RelationshipMultiplicity = RelationshipMultiplicity.Many;
Assert.True(associationType.IsManyToMany());
}
public void IsManyToMany_should_be_true_when_source_many_and_target_many()
{
var associationType = new AssociationType();
associationType.SourceEnd = new AssociationEndMember("S", new EntityType());
associationType.TargetEnd = new AssociationEndMember("T", new EntityType());
associationType.SourceEnd.RelationshipMultiplicity = RelationshipMultiplicity.Many;
associationType.TargetEnd.RelationshipMultiplicity = RelationshipMultiplicity.Many;
Assert.True(associationType.IsManyToMany());
}
public void Generate(AssociationType associationType, DbDatabaseMapping databaseMapping)
{
if (associationType.Constraint != null)
{
AssociationTypeMappingGenerator.GenerateForeignKeyAssociationType(associationType, databaseMapping);
}
else if (associationType.IsManyToMany())
{
this.GenerateManyToManyAssociation(associationType, databaseMapping);
}
else
{
this.GenerateIndependentAssociationType(associationType, databaseMapping);
}
}
public void Generate(AssociationType associationType, DbDatabaseMapping databaseMapping)
{
DebugCheck.NotNull(associationType);
DebugCheck.NotNull(databaseMapping);
if (associationType.Constraint != null)
{
GenerateForeignKeyAssociationType(associationType, databaseMapping);
}
else if (associationType.IsManyToMany())
{
GenerateManyToManyAssociation(associationType, databaseMapping);
}
else
{
GenerateIndependentAssociationType(associationType, databaseMapping);
}
}