Method Only

ent/node_query.go:133–146

Only returns a single Node entity found by the query, ensuring it only returns one. Returns a *NotSingularError when more than one Node entity is found. Returns a *NotFoundError when no Node entities are found.

(ctx context.Context)

// Returns a *NotSingularError when more than one Node entity is found.
// Returns a *NotFoundError when no Node entities are found.
func (nq *NodeQuery) Only(ctx context.Context) (*Node, error) {
	nodes, err := nq.Limit(2).All(setContextOp(ctx, nq.ctx, "Only"))
	if err != nil {
		return nil, err
	}
	switch len(nodes) {
	case 1:
		return nodes[0], nil
	case 0:
		return nil, &NotFoundError{node.Label}
	default:
		return nil, &NotSingularError{node.Label}
	}
}

// OnlyX is like Only, but panics if an error occurs.
func (nq *NodeQuery) OnlyX(ctx context.Context) *Node {