package wmo import ( "context" "errors" "go.mongodb.org/mongo-driver/bson" "go.mongodb.org/mongo-driver/mongo" "gogs.mikescher.com/BlackForestBytes/goext/exerr" "gogs.mikescher.com/BlackForestBytes/goext/langext" ) func (c *Coll[TData]) FindOne(ctx context.Context, filter bson.M) (TData, error) { r, err := c.findOneInternal(ctx, filter, false) if err != nil { return *new(TData), exerr.Wrap(err, "mongo-query[find-one] failed").Str("collection", c.Name()).Build() } return *r, nil } func (c *Coll[TData]) FindOneOpt(ctx context.Context, filter bson.M) (*TData, error) { r, err := c.findOneInternal(ctx, filter, true) if err != nil { return nil, exerr.Wrap(err, "mongo-query[find-one-opt] failed").Str("collection", c.Name()).Build() } return r, nil } func (c *Coll[TData]) FindOneByID(ctx context.Context, id EntityID) (TData, error) { r, err := c.findOneInternal(ctx, bson.M{"_id": id}, false) if err != nil { return *new(TData), exerr.Wrap(err, "mongo-query[find-one-by-id] failed").Id("id", id).Str("collection", c.Name()).Build() } return *r, nil } func (c *Coll[TData]) FindOneOptByID(ctx context.Context, id EntityID) (*TData, error) { r, err := c.findOneInternal(ctx, bson.M{"_id": id}, true) if err != nil { return nil, exerr.Wrap(err, "mongo-query[find-one-opt-by-id] failed").Id("id", id).Str("collection", c.Name()).Build() } return r, nil } func (c *Coll[TData]) findOneInternal(ctx context.Context, filter bson.M, allowNull bool) (*TData, error) { if len(c.extraModPipeline) == 0 { // simple case, use mongo FindOne mongoRes := c.coll.FindOne(ctx, filter) res, err := c.decodeSingle(ctx, mongoRes) if allowNull && errors.Is(err, mongo.ErrNoDocuments) { return nil, nil } if err != nil { return nil, exerr.Wrap(err, "mongo-query[find-one] failed").Any("filter", filter).Str("collection", c.Name()).Build() } return &res, nil } else { // complex case, we one ore more additional pipeline stages, convert to aggregation pipeline := mongo.Pipeline{} pipeline = append(pipeline, bson.D{{Key: "$match", Value: filter}}) pipeline = append(pipeline, bson.D{{Key: "$limit", Value: 1}}) pipeline = langext.ArrConcat(pipeline, c.extraModPipeline) cursor, err := c.coll.Aggregate(ctx, pipeline) if err != nil { return nil, exerr.Wrap(err, "mongo-aggregation [find-one] failed").Any("pipeline", pipeline).Str("collection", c.Name()).Build() } if cursor.Next(ctx) { v, err := c.decodeSingle(ctx, cursor) if err != nil { return nil, exerr.Wrap(err, "mongo-aggregation [find-one] failed to decode results").Any("pipeline", pipeline).Str("collection", c.Name()).Build() } return &v, nil } else if allowNull { return nil, nil } else { return nil, exerr.Wrap(mongo.ErrNoDocuments, "mongo-aggregation [find-one] returned no documents").Any("pipeline", pipeline).Str("collection", c.Name()).Build() } } }