/// <summary>
/// Returns the association information for the specified navigation property.
/// </summary>
/// <param name="navigationProperty">The navigation property to return association information for</param>
/// <returns>The association info</returns>
internal AssociationInfo GetAssociationInfo(NavigationProperty navigationProperty)
{
return(_associationMap.GetOrAdd(navigationProperty.RelationshipType.FullName, associationName =>
{
AssociationType associationType = (AssociationType)navigationProperty.RelationshipType;
if (!associationType.ReferentialConstraints.Any())
{
// We only support EF models where FK info is part of the model.
throw Error.NotSupported(Resource.LinqToEntitiesProvider_UnableToRetrieveAssociationInfo, associationName);
}
string toRoleName = associationType.ReferentialConstraints[0].ToRole.Name;
AssociationInfo associationInfo = new AssociationInfo()
{
FKRole = toRoleName,
Name = GetAssociationName(navigationProperty, toRoleName),
ThisKey = associationType.ReferentialConstraints[0].ToProperties.Select(p => p.Name).ToArray(),
OtherKey = associationType.ReferentialConstraints[0].FromProperties.Select(p => p.Name).ToArray(),
IsRequired = associationType.RelationshipEndMembers[0].RelationshipMultiplicity == RelationshipMultiplicity.One
};
return associationInfo;
}));
}
/// <summary>
/// Creates an AssociationAttribute for the specified navigation property
/// </summary>
/// <param name="navigationProperty">The navigation property that corresponds to the association (it identifies the end points)</param>
/// <returns>A new AssociationAttribute that describes the given navigation property association</returns>
internal AssociationAttribute CreateAssociationAttribute(NavigationProperty navigationProperty)
{
AssociationInfo assocInfo = GetAssociationInfo(navigationProperty);
bool isForeignKey = navigationProperty.FromEndMember.Name == assocInfo.FKRole;
string thisKey;
string otherKey;
if (isForeignKey)
{
thisKey = String.Join(",", assocInfo.ThisKey);
otherKey = String.Join(",", assocInfo.OtherKey);
}
else
{
otherKey = String.Join(",", assocInfo.ThisKey);
thisKey = String.Join(",", assocInfo.OtherKey);
}
AssociationAttribute assocAttrib = new AssociationAttribute(assocInfo.Name, thisKey, otherKey);
assocAttrib.IsForeignKey = isForeignKey;
return(assocAttrib);
}
/// <summary>
/// Returns the association information for the specified navigation property.
/// </summary>
/// <param name="navigationProperty">The navigation property to return association information for</param>
/// <returns>The association info</returns>
internal AssociationInfo GetAssociationInfo(NavigationProperty navigationProperty)
{
return _associationMap.GetOrAdd(navigationProperty.RelationshipType.FullName, associationName =>
{
AssociationType associationType = (AssociationType)navigationProperty.RelationshipType;
if (!associationType.ReferentialConstraints.Any())
{
// We only support EF models where FK info is part of the model.
throw Error.NotSupported(Resource.LinqToEntitiesProvider_UnableToRetrieveAssociationInfo, associationName);
}
string toRoleName = associationType.ReferentialConstraints[0].ToRole.Name;
AssociationInfo associationInfo = new AssociationInfo()
{
FKRole = toRoleName,
Name = GetAssociationName(navigationProperty, toRoleName),
ThisKey = associationType.ReferentialConstraints[0].ToProperties.Select(p => p.Name).ToArray(),
OtherKey = associationType.ReferentialConstraints[0].FromProperties.Select(p => p.Name).ToArray(),
IsRequired = associationType.RelationshipEndMembers[0].RelationshipMultiplicity == RelationshipMultiplicity.One
};
return associationInfo;
});
}