+sub LimitToLookupType {
+ my $self = shift;
+ my $lookup = shift;
+
+ $self->Limit( FIELD => 'LookupType', VALUE => "$lookup" );
+}
+
+=head2 LimitToChildType
+
+Takes partial LookupType and limits collection to records
+where LookupType is equal or ends with the value.
+
+=cut
+
+sub LimitToChildType {
+ my $self = shift;
+ my $lookup = shift;
+
+ $self->Limit( FIELD => 'LookupType', VALUE => "$lookup", OPERATOR => "ENDSWITH" );
+}
+
+
+=head2 LimitToParentType
+
+Takes partial LookupType and limits collection to records
+where LookupType is equal or starts with the value.
+
+=cut
+
+sub LimitToParentType {
+ my $self = shift;
+ my $lookup = shift;
+
+ $self->Limit( FIELD => 'LookupType', VALUE => "$lookup", OPERATOR => "STARTSWITH" );
+}
+
+=head2 LimitToObjectId
+
+Takes an ObjectId and limits the collection to CFs applied to said object.
+
+When called multiple times the ObjectId limits are joined with OR.
+
+=cut
+
+sub LimitToObjectId {
+ my $self = shift;
+ my $id = shift;
+ $self->Limit(
+ ALIAS => $self->_OCFAlias,
+ FIELD => 'ObjectId',
+ OPERATOR => '=',
+ VALUE => $id || 0,
+ ENTRYAGGREGATOR => 'OR'
+ );
+}
+
+=head2 LimitToGlobalOrObjectId
+
+Takes list of object IDs and limits collection to custom
+fields that are added to these objects or globally.
+
+=cut
+
+sub LimitToGlobalOrObjectId {
+ my $self = shift;
+ my $global_only = 1;
+
+
+ foreach my $id (@_) {
+ $self->LimitToObjectId($id);
+ $global_only = 0 if $id;
+ }
+
+ $self->LimitToObjectId(0) unless $global_only;
+}
+
+=head2 LimitToNotAdded
+
+Takes either list of object ids or nothing. Limits collection
+to custom fields to listed objects or any corespondingly. Use
+zero to mean global.
+
+=cut
+
+sub LimitToNotAdded {
+ my $self = shift;
+ return RT::ObjectCustomFields->new( $self->CurrentUser )
+ ->LimitTargetToNotAdded( $self => @_ );
+}
+
+=head2 LimitToAdded
+
+Limits collection to custom fields to listed objects or any corespondingly. Use
+zero to mean global.
+
+=cut
+
+sub LimitToAdded {
+ my $self = shift;
+ return RT::ObjectCustomFields->new( $self->CurrentUser )
+ ->LimitTargetToAdded( $self => @_ );
+}
+
+=head2 LimitToGlobalOrQueue QUEUEID
+
+Limits the set of custom fields found to global custom fields or those
+tied to the queue C<QUEUEID>, similar to L</LimitToGlobalOrObjectId>.
+
+Note that this will cause the collection to only return ticket CFs.
+
+=cut
+
+sub LimitToGlobalOrQueue {