nil lookup fix

crud.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 	"time"
 
+	mgo "gopkg.in/mgo.v2"
 	"gopkg.in/mgo.v2/bson"
 )
 
@@ -27,7 +28,7 @@ func (e *ErrorWithStack) Stack() string {
 }
 
 // CreateDocument creates a document from specified model
-func (db *Database) CreateDocument(m ModelInterface) error {
+func CreateDocument(db *mgo.Database, m ModelInterface) error {
 	m.PrepareInsert()
 
 	c := db.C(GetCollectionName(m))
@@ -37,7 +38,7 @@ func (db *Database) CreateDocument(m ModelInterface) error {
 }
 
 // ReadDocument gets one document via its id
-func (db *Database) ReadDocument(m ModelInterface, selector bson.M) error {
+func ReadDocument(db *mgo.Database, m ModelInterface, selector bson.M) error {
 	c := db.C(GetCollectionName(m))
 
 	q := c.FindId(m.GetID())
@@ -136,7 +137,7 @@ func idToObjectID(filter interface{}) {
 }
 
 // ReadCollection gets the filtered collection of the model
-func (db *Database) ReadCollection(results interface{}, filter bson.M, selector bson.M, offset int, limit int, sort []string, pipelineModifier PipelineModifierFunction) (err error) {
+func ReadCollection(db *mgo.Database, results interface{}, filter bson.M, selector bson.M, offset int, limit int, sort []string, pipelineModifier PipelineModifierFunction) (err error) {
 	defer func() {
 		if r := recover(); r != nil {
 			err = &ErrorWithStack{Message: fmt.Sprintf("%v", r), StackTrace: string(debug.Stack())}
@@ -211,7 +212,8 @@ func (db *Database) ReadCollection(results interface{}, filter bson.M, selector
 			pipeline = pipelineModifier(pipeline)
 		}
 
-		_err = c.Pipe(pipeline).All(results)
+		q := c.Pipe(pipeline).AllowDiskUse().Iter()
+		_err = q.All(results)
 	} else {
 		// search without pipe is faster
 
@@ -243,7 +245,7 @@ func (db *Database) ReadCollection(results interface{}, filter bson.M, selector
 }
 
 // ReadCollectionCount gets the count of elements in filtered collection
-func (db *Database) ReadCollectionCount(m ModelInterface, filter bson.M) (count int, err error) {
+func ReadCollectionCount(db *mgo.Database, m ModelInterface, filter bson.M) (count int, err error) {
 	defer func() {
 		if r := recover(); r != nil {
 			err = fmt.Errorf("%v", r)
@@ -255,7 +257,7 @@ func (db *Database) ReadCollectionCount(m ModelInterface, filter bson.M) (count
 }
 
 // UpdateDocument updates a document from specified model
-func (db *Database) UpdateDocument(m ModelInterface, changes bson.M) error {
+func UpdateDocument(db *mgo.Database, m ModelInterface, changes bson.M) error {
 	m.PrepareUpdate()
 	changes["updateTime"] = time.Now()
 
@@ -266,7 +268,7 @@ func (db *Database) UpdateDocument(m ModelInterface, changes bson.M) error {
 }
 
 // UpsertDocument updates a document from specified model or inserts it, of not found
-func (db *Database) UpsertDocument(m ModelInterface, changes bson.M) error {
+func UpsertDocument(db *mgo.Database, m ModelInterface, changes bson.M) error {
 	m.PrepareUpdate()
 	changes["updateTime"] = time.Now()
 
@@ -277,7 +279,7 @@ func (db *Database) UpsertDocument(m ModelInterface, changes bson.M) error {
 }
 
 // DeleteDocument deletes one document via its id
-func (db *Database) DeleteDocument(m ModelInterface) error {
+func DeleteDocument(db *mgo.Database, m ModelInterface) error {
 	c := db.C(GetCollectionName(m))
 
 	err := c.RemoveId(m.GetID())
@@ -286,12 +288,12 @@ func (db *Database) DeleteDocument(m ModelInterface) error {
 }
 
 // DeleteDocuments deletes documents found by filter
-func (db *Database) DeleteDocuments(m ModelInterface, filter bson.M) (removed int, err error) {
+func DeleteDocuments(db *mgo.Database, m ModelInterface, filter bson.M) (removed int, err error) {
 	c := db.C(GetCollectionName(m))
 
 	info, err := c.RemoveAll(filter)
 	if info != nil {
-		removed = info.Removed()
+		removed = info.Removed
 	}
 
 	return removed, err

go.mod

@@ -1,4 +1,4 @@
-module gitbase.de/gopackage/mgocrud/v2
+module gitbase.de/gopackage/mgocrud
 
 go 1.16
 

lookup.go

@@ -4,11 +4,12 @@ import (
 	"fmt"
 	"reflect"
 
+	mgo "gopkg.in/mgo.v2"
 	"gopkg.in/mgo.v2/bson"
 )
 
 // Lookup extends results with data for inline structs
-func (db *Database) Lookup(structField string, results interface{}, selector bson.M) error {
+func Lookup(db *mgo.Database, structField string, results interface{}, selector bson.M) error {
 
 	t := reflect.TypeOf(results)
 	v := reflect.ValueOf(results)
@@ -93,7 +94,7 @@ func (db *Database) Lookup(structField string, results interface{}, selector bso
 		// no entries to map
 		return nil
 	}
-	sArr := make([]bson.M, lArr)
+	sArr := make([]bson.M, lArr, lArr)
 	aI := 0
 	for sID := range objectIDs {
 		sArr[aI] = bson.M{
@@ -122,7 +123,7 @@ func (db *Database) Lookup(structField string, results interface{}, selector bso
 		return fmt.Errorf("ID type in objects struct %+v is not bson.ObjectId", fieldType)
 	}
 
-	err := db.ReadCollection(objectResults, sQuery, selector, 0, 0, nil, nil)
+	err := ReadCollection(db, objectResults, sQuery, selector, 0, 0, nil, nil)
 	if err != nil {
 		panic(err)
 	}
@@ -155,10 +156,14 @@ func (db *Database) Lookup(structField string, results interface{}, selector bso
 		object := objectIDs[objectID]
 
 		field := elV.FieldByName(structField)
+		if object != nil && field.CanSet() {
+			objectVal := reflect.ValueOf(object)
+
 			if fieldIsPtr {
-			field.Set(reflect.ValueOf(object))
+				field.Set(objectVal)
 			} else {
-			field.Set(reflect.ValueOf(object).Elem())
+				field.Set(objectVal.Elem())
+			}
 		}
 
 	}

session.go

@@ -1,196 +0,0 @@
-package mgocrud
-
-import (
-	"errors"
-
-	mgo "gopkg.in/mgo.v2"
-)
-
-var (
-	ErrNotFound = errors.New("not found")
-)
-
-type Connection struct {
-	connection *mgo.Session
-}
-
-func NewConnection(dial string) (*Connection, error) {
-	connection, err := mgo.Dial(dial)
-	if err != nil {
-		return nil, err
-	}
-	connection.SetMode(mgo.Monotonic, true)
-	return &Connection{connection: connection}, nil
-}
-
-func (c *Connection) Close() {
-	c.connection.Close()
-}
-
-type Session struct {
-	session *mgo.Session
-}
-
-func (s *Session) Close() {
-	s.session.Close()
-}
-
-func (c *Connection) NewSession() (*Session, error) {
-	return &Session{session: c.connection.Copy()}, nil
-}
-
-type Database struct {
-	database *mgo.Database
-	session  *Session
-}
-
-func (s *Session) DB(name string) *Database {
-	return &Database{database: s.session.DB(name), session: s}
-}
-
-type Collection struct {
-	collection *mgo.Collection
-}
-
-func (db *Database) Session() *Session {
-	return db.session
-}
-
-func (db *Database) C(name string) *Collection {
-	return &Collection{collection: db.database.C(name)}
-}
-
-func (db *Database) Name() string {
-	return db.database.Name
-}
-
-func (c *Collection) Insert(docs ...interface{}) error {
-	return c.collection.Insert(docs...)
-}
-
-func (c *Collection) UpdateId(id interface{}, update interface{}) error {
-	return c.collection.UpdateId(id, update)
-}
-
-func (c *Collection) RemoveId(id interface{}) error {
-	return c.collection.RemoveId(id)
-}
-
-type ChangeInfo struct {
-	changeInfo *mgo.ChangeInfo
-}
-
-func (ci *ChangeInfo) Matched() int {
-	return ci.changeInfo.Matched
-}
-
-func (ci *ChangeInfo) Removed() int {
-	return ci.changeInfo.Removed
-}
-
-func (ci *ChangeInfo) Updated() int {
-	return ci.changeInfo.Updated
-}
-
-func (c *Collection) Upsert(selector interface{}, update interface{}) (*ChangeInfo, error) {
-	ci, err := c.collection.Upsert(selector, update)
-	if err != nil {
-		return nil, err
-	}
-	return &ChangeInfo{changeInfo: ci}, nil
-}
-
-func (c *Collection) RemoveAll(filter interface{}) (*ChangeInfo, error) {
-	ci, err := c.collection.RemoveAll(filter)
-	if err != nil {
-		return nil, err
-	}
-	return &ChangeInfo{changeInfo: ci}, nil
-}
-
-type Query struct {
-	query *mgo.Query
-}
-
-func (c *Collection) FindId(id interface{}) *Query {
-	return &Query{query: c.collection.FindId(id)}
-}
-
-func (c *Collection) Find(query interface{}) *Query {
-	return &Query{query: c.collection.Find(query)}
-}
-
-func (q *Query) Select(selector interface{}) *Query {
-	q.query = q.query.Select(selector)
-	return q
-}
-
-func (q *Query) One(result interface{}) error {
-	err := q.query.One(result)
-	if err == mgo.ErrNotFound {
-		err = ErrNotFound
-	}
-	return err
-}
-
-func (q *Query) Sort(fields ...string) *Query {
-	q.query = q.query.Sort(fields...)
-	return q
-}
-
-func (q *Query) Skip(n int) *Query {
-	q.query = q.query.Skip(n)
-	return q
-}
-
-func (q *Query) Limit(n int) *Query {
-	q.query = q.query.Limit(n)
-	return q
-}
-
-func (q *Query) All(result interface{}) error {
-	err := q.query.All(result)
-	if err == mgo.ErrNotFound {
-		err = ErrNotFound
-	}
-	return err
-}
-
-func (q *Query) Count() (int, error) {
-	c, err := q.query.Count()
-	if err == mgo.ErrNotFound {
-		err = ErrNotFound
-	}
-	return c, err
-}
-
-type Index struct {
-	index *mgo.Index
-}
-
-func NewMgoIndex(index mgo.Index) *Index {
-	return &Index{index: &index}
-}
-
-func (c *Collection) EnsureIndex(index *Index) error {
-	if index != nil && index.index != nil {
-		return c.collection.EnsureIndex(*index.index)
-	}
-	return errors.New("index parameter not initialized with mgo.Index")
-}
-
-type Pipe struct {
-	pipe *mgo.Pipe
-}
-
-func (p *Pipe) All(result interface{}) error {
-	err := p.pipe.All(result)
-	if err == mgo.ErrNotFound {
-		err = ErrNotFound
-	}
-	return err
-}
-
-func (c *Collection) Pipe(pipeline interface{}) *Pipe {
-	return &Pipe{pipe: c.collection.Pipe(pipeline).AllowDiskUse()}
-}

setup.go

@@ -9,7 +9,7 @@ import (
 )
 
 // EnsureIndex ensured mongodb index reflecting model struct index tag
-func (db *Database) EnsureIndex(m ModelInterface) error {
+func EnsureIndex(db *mgo.Database, m ModelInterface) error {
 	colName := GetCollectionName(m)
 	col := db.C(colName)
 
@@ -57,14 +57,14 @@ func (db *Database) EnsureIndex(m ModelInterface) error {
 							case indexEl == "text":
 								textFields = append(textFields, "$text:"+fieldbase+bsonField)
 							default:
-								return fmt.Errorf("invalid index tag on collection %s.%s for field %s%s in model %+v", db.Name(), colName, fieldbase, bsonField, t)
+								return fmt.Errorf("invalid index tag on collection %s.%s for field %s%s in model %+v", db.Name, colName, fieldbase, bsonField, t)
 							}
 
 						}
 						if len(index.Key) > 0 {
 							// fmt.Println(bsonField, index)
-							fmt.Printf("ensure index on collection %s.%s for field %s%s\n", db.Name(), colName, fieldbase, bsonField)
+							fmt.Printf("ensure index on collection %s.%s for field %s%s\n", db.Name, colName, fieldbase, bsonField)
-							err := col.EnsureIndex(NewMgoIndex(index))
+							err := col.EnsureIndex(index)
 							if err != nil {
 								return err
 							}
@@ -93,13 +93,13 @@ func (db *Database) EnsureIndex(m ModelInterface) error {
 
 	if len(textFields) > 0 {
 		// fmt.Println("$text", textFields)
-		fmt.Printf("ensure text index on collection %s.%s for fields %v\n", db.Name(), GetCollectionName(m), textFields)
+		fmt.Printf("ensure text index on collection %s.%s for fields %v\n", db.Name, GetCollectionName(m), textFields)
-		err := col.EnsureIndex(NewMgoIndex(mgo.Index{
+		err := col.EnsureIndex(mgo.Index{
 			Name:            "textindex",
 			Key:             textFields,
 			DefaultLanguage: "german",
 			Background:      false,
-		}))
+		})
 		if err != nil {
 			return err
 		}

validator.go

@@ -2,11 +2,12 @@ package mgocrud
 
 import (
 	validator "gopkg.in/go-playground/validator.v8"
+	mgo "gopkg.in/mgo.v2"
 	"gopkg.in/mgo.v2/bson"
 )
 
 // ValidateObject validates object via validator tag and custom method
-func (db *Database) ValidateObject(m ModelInterface, changes bson.M) error {
+func ValidateObject(db *mgo.Database, m ModelInterface, changes bson.M) error {
 	// first validate via struct tag
 	validator := validator.New(&validator.Config{
 		TagName: "validator",
@@ -18,7 +19,7 @@ func (db *Database) ValidateObject(m ModelInterface, changes bson.M) error {
 
 	// next execute custom model validator if exists
 	if i, ok := m.(interface {
-		Validate(db *Database, changes bson.M) error
+		Validate(db *mgo.Database, changes bson.M) error
 	}); ok {
 		return i.Validate(db, changes)
 	}