public virtual ConfigurationSource?RemoveRelationship([NotNull] ForeignKey foreignKey, ConfigurationSource configurationSource)
{
if (foreignKey.EntityType != Metadata)
{
return(ModelBuilder.Entity(foreignKey.EntityType.Name, ConfigurationSource.Convention)
.RemoveRelationship(foreignKey, configurationSource));
}
var removedConfigurationSource = _relationshipBuilders.Value.Remove(foreignKey, configurationSource);
if (removedConfigurationSource == null)
{
return(null);
}
var principalEntityTypeBuilder = ModelBuilder.Entity(foreignKey.PrincipalEntityType.Name, ConfigurationSource.Convention);
var navigationToDependent = foreignKey.GetNavigationToDependent();
navigationToDependent?.EntityType.RemoveNavigation(navigationToDependent);
var navigationToPrincipal = foreignKey.GetNavigationToPrincipal();
navigationToPrincipal?.EntityType.RemoveNavigation(navigationToPrincipal);
Metadata.RemoveForeignKey(foreignKey);
ModelBuilder.ConventionDispatcher.OnForeignKeyRemoved(this, foreignKey);
RemoveShadowPropertiesIfUnused(foreignKey.Properties);
principalEntityTypeBuilder.RemoveKeyIfUnused(foreignKey.PrincipalKey);
return(removedConfigurationSource);
}
public virtual bool RemoveRelationship([NotNull] ForeignKey foreignKey, ConfigurationSource configurationSource)
{
if (foreignKey.EntityType != Metadata)
{
return(ModelBuilder.Entity(foreignKey.EntityType.Name, ConfigurationSource.Convention)
.RemoveRelationship(foreignKey, configurationSource));
}
if (!_relationshipBuilders.Value.Remove(foreignKey, configurationSource))
{
return(false);
}
var navigationToDependent = foreignKey.GetNavigationToDependent();
navigationToDependent?.EntityType.RemoveNavigation(navigationToDependent);
var navigationToPrincipal = foreignKey.GetNavigationToPrincipal();
navigationToPrincipal?.EntityType.RemoveNavigation(navigationToPrincipal);
Metadata.RemoveForeignKey(foreignKey);
RemoveShadowPropertiesIfUnused(foreignKey.Properties, configurationSource);
return(true);
}
private void RemoveForeignKeyIfUnused(ForeignKey foreignKey, ConfigurationSource configurationSource)
{
if (foreignKey.GetNavigationToDependent() == null &&
foreignKey.GetNavigationToPrincipal() == null)
{
RemoveRelationship(foreignKey, configurationSource);
}
}
private bool Navigation(
[CanBeNull] string navigationName,
[NotNull] ForeignKey foreignKey,
bool pointsToPrincipal,
ConfigurationSource configurationSource,
bool canOverrideSameSource)
{
Check.NotNull(foreignKey, "foreignKey");
var navigation = pointsToPrincipal
? foreignKey.GetNavigationToPrincipal()
: foreignKey.GetNavigationToDependent();
var fkOwner = foreignKey.EntityType == Metadata
? this
: ModelBuilder.Entity(foreignKey.EntityType.Name, ConfigurationSource.Convention);
if (navigationName == navigation?.Name)
{
fkOwner._relationshipBuilders.Value.UpdateConfigurationSource(foreignKey, configurationSource);
return(true);
}
if (!CanSetNavigation(navigationName, foreignKey, pointsToPrincipal, configurationSource, canOverrideSameSource))
{
return(false);
}
navigation?.EntityType.RemoveNavigation(navigation);
var conflictingNavigation = navigationName == null
? null
: Metadata.TryGetNavigation(navigationName);
if (conflictingNavigation != null)
{
var removed = RemoveRelationship(conflictingNavigation.ForeignKey, configurationSource);
Debug.Assert(removed);
}
if (navigationName != null)
{
if (_ignoredProperties.HasValue)
{
_ignoredProperties.Value.Remove(navigationName);
}
fkOwner._relationshipBuilders.Value.UpdateConfigurationSource(foreignKey, configurationSource);
Metadata.AddNavigation(navigationName, foreignKey, pointsToPrincipal);
return(true);
}
return(true);
}
private bool ShouldFlip(ForeignKey foreignKey, IReadOnlyList<Property> currentDependentCandidateProperties)
{
var currentPrincipalCandidateProperties = GetCandidateForeignKeyProperties(foreignKey, onDependent: false);
if (currentDependentCandidateProperties != null
&& currentPrincipalCandidateProperties == null)
{
return false;
}
if (currentDependentCandidateProperties == null
&& currentPrincipalCandidateProperties != null)
{
return true;
}
var navigationToPrincipal = foreignKey.GetNavigationToPrincipal();
var navigationToDependent = foreignKey.GetNavigationToDependent();
if (navigationToPrincipal == null
&& navigationToDependent != null)
{
return false;
}
if (navigationToPrincipal != null
&& navigationToDependent == null)
{
return true;
}
var model = foreignKey.EntityType.Model;
var principalPk = foreignKey.PrincipalEntityType.FindPrimaryKey();
var principalPkReferenceThreshold = foreignKey.PrincipalKey == principalPk? 1 : 0;
var isPrincipalKeyReferenced = principalPk != null && model.GetReferencingForeignKeys(principalPk).Count > principalPkReferenceThreshold;
var dependentPk = foreignKey.EntityType.FindPrimaryKey();
var isDependentPrimaryKeyReferenced = dependentPk != null && model.GetReferencingForeignKeys(dependentPk).Count > 0;
if (isPrincipalKeyReferenced
&& !isDependentPrimaryKeyReferenced)
{
return false;
}
if (!isPrincipalKeyReferenced
&& isDependentPrimaryKeyReferenced)
{
return true;
}
return StringComparer.Ordinal.Compare(foreignKey.PrincipalEntityType.Name, foreignKey.EntityType.Name) > 0;
}
private RelationshipSnapshot DetachRelationship([NotNull] ForeignKey foreignKey, ConfigurationSource configurationSource)
{
var navigationToPrincipalName = foreignKey.GetNavigationToPrincipal()?.Name;
var navigationToDependentName = foreignKey.GetNavigationToDependent()?.Name;
var relationship = Relationship(foreignKey, true, ConfigurationSource.Convention);
var relationshipConfigurationSource = RemoveRelationship(foreignKey, configurationSource);
if (relationshipConfigurationSource == null)
{
return(null);
}
return(new RelationshipSnapshot(relationship, navigationToPrincipalName, navigationToDependentName, relationshipConfigurationSource.Value));
}
private bool CanSetNavigation(
string navigationName,
ForeignKey foreignKey,
bool pointsToPrincipal,
ConfigurationSource configurationSource,
bool canOverrideSameSource)
{
var navigation = pointsToPrincipal
? foreignKey.GetNavigationToPrincipal()
: foreignKey.GetNavigationToDependent();
if (navigationName == navigation?.Name)
{
return(true);
}
if (!CanRemove(foreignKey, configurationSource, canOverrideSameSource))
{
return(false);
}
var conflictingNavigation = navigationName == null
? null
: Metadata.TryGetNavigation(navigationName);
if (conflictingNavigation != null &&
!CanRemove(conflictingNavigation.ForeignKey, configurationSource, canOverrideSameSource))
{
return(false);
}
if (navigationName != null &&
!CanAdd(navigationName, isNavigation: true, configurationSource: configurationSource))
{
return(false);
}
return(true);
}
private IReadOnlyList<Property> GetCandidateForeignKeyProperties(ForeignKey foreignKey, bool onDependent)
{
var baseNames = new List<string>();
var navigation = onDependent
? foreignKey.GetNavigationToPrincipal()
: foreignKey.GetNavigationToDependent();
if (navigation != null)
{
baseNames.Add(navigation.Name);
}
var entityTypeToReference = onDependent
? foreignKey.PrincipalEntityType
: foreignKey.EntityType;
baseNames.Add(entityTypeToReference.DisplayName());
baseNames.Add("");
foreach (var baseName in baseNames)
{
var match = TryFindMatchingClrProperties(foreignKey, baseName, onDependent);
if (match != null)
{
return match;
}
}
return null;
}