First implementation

romnn · Apr 20, 2020 · 05fcbf3 · 05fcbf3
1 parent 097d5df
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diff --git a/README.md b/README.md
@@ -5,7 +5,7 @@
 [![GoDoc](https://godoc.org/github.com/romnnn/flatbson?status.svg)](https://godoc.org/github.com/romnnn/flatbson)  [![Test Coverage](https://codecov.io/gh/romnnn/flatbson/branch/master/graph/badge.svg)](https://codecov.io/gh/romnnn/flatbson)
 [![Release](https://img.shields.io/github/release/romnnn/flatbson)](https://github.com/romnnn/flatbson/releases/latest)
 
-Your description goes here...
+Go package for flattening bson documents.
 
 
 
@@ -15,6 +15,28 @@ Your description goes here...
 import "github.com/romnnn/flatbson"
 ```
 
+Example:
+```golang
+import (
+	"fmt"
+	"github.com/romnnn/flatbson"
+	"go.mongodb.org/mongo-driver/bson"
+)
+
+func main() {
+    input := bson.D{
+		{"user", bson.D{{"email", "test"}}},
+		{"metadata", bson.D{{"city", bson.D{{"name", "Berlin"}}}}},
+	}
+	// Flatten the document
+	flattened, err := flatbson.Flattened(input, ".")
+	if err != nil {
+		panic(err)
+	}
+    fmt.Println(flattened)
+}
+```
+
 For more examples, see `examples/`.
 
 

diff --git a/examples/example1/example1.go b/examples/example1/example1.go
@@ -1,15 +1,34 @@
 package main
 
 import (
-	"fmt"
+	"log"
+	"sort"
 
 	"github.com/romnnn/flatbson"
+	"go.mongodb.org/mongo-driver/bson"
 )
 
-func run() string {
-	return flatbson.Shout("This is an example")
+func getLongestKey() string {
+	input := bson.D{
+		{Key: "user", Value: bson.D{{Key: "email", Value: "test"}}},
+		{Key: "metadata", Value: bson.D{{Key: "city", Value: bson.D{{Key: "name", Value: "Berlin"}}}}},
+	}
+	// Flatten the document
+	flattened, err := flatbson.Flattened(input, ".")
+	if err != nil {
+		log.Fatalf("Failed to flatten: %v", err)
+	}
+	log.Printf("Flattened: %v\n", flattened)
+
+	// Get the longest key
+	keys := make([]string, 0, len(flattened))
+	for k := range flattened.Map() {
+		keys = append(keys, k)
+	}
+	sort.Sort(sort.StringSlice(keys))
+	return keys[0]
 }
 
 func main() {
-	fmt.Println(run())
+	log.Println(getLongestKey())
 }
diff --git a/examples/example1/example1_test.go b/examples/example1/example1_test.go
@@ -5,8 +5,8 @@ import (
 )
 
 func TestCli(t *testing.T) {
-	out := run()
-	expected := "This is an example!"
+	out := getLongestKey()
+	expected := "metadata.city.name"
 	if out != expected {
 		t.Errorf("Got %s but expected %s", out, expected)
 	}

diff --git a/flatbson.go b/flatbson.go
@@ -1,9 +1,94 @@
 package flatbson
 
+import (
+	"fmt"
+	"reflect"
+	"strconv"
+
+	"go.mongodb.org/mongo-driver/bson"
+)
+
 // Version is incremented using bump2version
 const Version = "0.0.1"
 
-// Shout returns the input message with an exclamation mark
-func Shout(s string) string {
-	return s + "!"
+var defaultSeparator = "."
+
+// Flattener represents flattening options
+type Flattener struct {
+	FlattenSlices bool
+	Separator     *string
+	flattened     *bson.D
+}
+
+func (f *Flattener) flatten(input interface{}, lkey string) error {
+	var err error
+	var inputMap bson.D
+	switch input.(type) {
+	case bson.D:
+		inputMap = input.(bson.D)
+	case bson.E:
+		inputMap = bson.D{input.(bson.E)}
+	case bson.M:
+		for k, v := range input.(bson.M) {
+			inputMap = append(inputMap, bson.E{Key: k, Value: v})
+		}
+	default:
+		return fmt.Errorf("Cannot flatten %v of type %v", input, reflect.TypeOf(input))
+	}
+	for i := 0; i < len(inputMap); i++ {
+		// for rkey, value := range inputMap {
+		rkey := inputMap[i].Key
+		value := inputMap[i].Value
+		key := lkey + rkey
+		// Check for nested document
+		if nested, ok := value.(bson.D); ok {
+			err = f.flatten(nested, key+*f.Separator)
+		} else if nested, ok := value.(bson.M); ok {
+			err = f.flatten(nested, key+*f.Separator)
+		} else if nested, ok := value.(bson.E); ok {
+			err = f.flatten(nested, key+*f.Separator)
+		} else if nested, ok := value.(bson.A); ok && f.FlattenSlices {
+			// Convert slice to map using indices as keys
+			mapped := bson.D{}
+			for i, v := range nested {
+				mapped = append(mapped, bson.E{Key: strconv.Itoa(i), Value: v})
+			}
+			err = f.flatten(mapped, key+*f.Separator)
+		} else {
+			// Add the value
+			*f.flattened = append(*f.flattened, bson.E{Key: key, Value: value})
+		}
+	}
+	return err
+}
+
+// Flatten flattens a bson D or M document
+func (f *Flattener) Flatten(input interface{}, flattened *bson.D) error {
+	f.flattened = flattened
+	if f.Separator == nil {
+		f.Separator = &defaultSeparator
+	}
+	return f.flatten(input, "")
+}
+
+// Flattened returns a new, flattened bson.D from a bson D or M document
+func (f *Flattener) Flattened(input interface{}) (bson.D, error) {
+	var flattened bson.D
+	err := f.Flatten(input, &flattened)
+	return flattened, err
+}
+
+// Flatten flattens a bson D or M document
+func Flatten(input interface{}, flattened *bson.D, separator string) error {
+	f := &Flattener{
+		Separator: &separator,
+	}
+	return f.Flatten(input, flattened)
+}
+
+// Flattened returns a new, flattened bson.D from a bson D or M document
+func Flattened(input interface{}, separator string) (bson.D, error) {
+	var flattened bson.D
+	err := Flatten(input, &flattened, separator)
+	return flattened, err
 }
diff --git a/flatbson_test.go b/flatbson_test.go
@@ -1,12 +1,70 @@
 package flatbson
 
-import "testing"
+import (
+	"testing"
 
-func TestShout(t *testing.T) {
-	if Shout("Test") != "Test!" {
-		t.Errorf("Got %s but want \"Test!\"", Shout("Test"))
+	"github.com/romnnn/deepequal"
+	"go.mongodb.org/mongo-driver/bson"
+)
+
+func TestFlatten(t *testing.T) {
+	input := bson.D{
+		{Key: "user", Value: bson.D{
+			{Key: "email", Value: "test"},
+			{Key: "list", Value: bson.A{"a0", bson.M{"a1": bson.E{Key: "will be", Value: "flattened"}}, "a2"}},
+		}},
+	}
+	expected := bson.D{
+		{Key: "user.email", Value: "test"},
+		{Key: "user.list", Value: bson.A{"a0", bson.M{"a1": bson.E{Key: "will be", Value: "flattened"}}, "a2"}},
+	}
+	flattened, err := Flattened(input, ".")
+	if err != nil {
+		t.Errorf("Failed to flatten: %v", err)
+	}
+	if equal, err := deepequal.DeepEqual(flattened, expected); err != nil || !equal {
+		t.Errorf("\nGot: %v\nWant %v\nError: %v", flattened, expected, err)
+	}
+}
+
+func TestFlattenWithSlices(t *testing.T) {
+	input := bson.D{
+		{Key: "user", Value: bson.D{
+			{Key: "email", Value: "test"},
+			{Key: "list", Value: bson.A{"a0", bson.D{{Key: "a1", Value: bson.E{Key: "will be", Value: "flattened"}}}, "a2"}},
+		}},
+	}
+	expected := bson.D{
+		{Key: "user.email", Value: "test"},
+		{Key: "user.list.0", Value: "a0"},
+		{Key: "user.list.1.a1.will be", Value: "flattened"},
+		{Key: "user.list.2", Value: "a2"},
+	}
+	f := &Flattener{FlattenSlices: true}
+	flattened, err := f.Flattened(input)
+	if err != nil {
+		t.Errorf("Failed to flatten: %v", err)
+	}
+	if equal, err := deepequal.DeepEqual(flattened, expected); err != nil || !equal {
+		t.Errorf("\nGot: %v\nWant %v\nError: %v", flattened, expected, err)
+	}
+}
+
+func TestSeparators(t *testing.T) {
+	input := bson.D{
+		{Key: "user", Value: bson.D{{Key: "email", Value: "test"}}},
+	}
+	tests := map[string]bson.D{
+		".": bson.D{{Key: "user.email", Value: "test"}},
+		" ": bson.D{{Key: "user email", Value: "test"}},
 	}
-	if Shout("") != "!" {
-		t.Errorf("Got %s but want \"!\"", Shout(""))
+	for sep, expected := range tests {
+		flattened, err := Flattened(input, sep)
+		if err != nil {
+			t.Errorf("Failed to flatten: %v", err)
+		}
+		if equal, err := deepequal.DeepEqual(flattened, expected); err != nil || !equal {
+			t.Errorf("\nGot: %v\nWant %v\nError: %v", flattened, expected, err)
+		}
 	}
 }
diff --git a/go.mod b/go.mod
@@ -1,3 +1,9 @@
 module github.com/romnnn/flatbson
 
 go 1.13
+
+require (
+	github.com/romnnn/deepequal v0.0.0-20200304153056-ea9233e420e6
+	go.mongodb.org/mongo-driver v1.3.2
+	gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22
+)
diff --git a/go.sum b/go.sum
@@ -0,0 +1,98 @@
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