Merge pull request #13 from sunboyy/getting-started

Create a getting started document and example

README.md

@@ -17,3 +17,63 @@ Repogen is a library that generates MongoDB repository implementation from repos
 - Method signature validation
 - Supports single-entity and multiple-entity operations
 - Supports many comparison operators
+
+## Getting Started
+
+This getting started tutorial shows a simple example on how to use repogen. You can also see the working code inside `examples` directory for more information.
+
+### Step 1: Download and install repogen
+
+Run this command in your terminal to download and install repogen
+
+```
+$ go get github.com/sunboyy/repogen
+```
+
+### Step 2: Write a repository specification
+
+Write repository specification as an interface in the same file as the model struct. There are 4 types of operations that are currently supported and are determined by the first word of the method name. Single-entity and multiple-entity modes are determined be the first return value. More complex queries can also be written.
+
+```go
+// You write this interface specification (comment is optional)
+type UserRepository interface {
+	// InsertOne stores userModel into the database and returns inserted ID if insertion
+	// succeeds and returns error if insertion fails.
+	InsertOne(ctx context.Context, userModel *UserModel) (interface{}, error)
+
+	// FindByUsername queries user by username. If a user with specified username exists,
+	// the user will be returned. Otherwise, error will be returned.
+	FindByUsername(ctx context.Context, username string) (*UserModel, error)
+
+	// UpdateDisplayNameByID updates a user with the specified ID with a new display name.
+	// If there is a user matches the query, it will return true. Error will be returned
+	// only when error occurs while accessing the database.
+	UpdateDisplayNameByID(ctx context.Context, displayName string, id primitive.ObjectID) (bool, error)
+
+	// DeleteByCity deletes users that have `city` value match the parameter and returns
+	// the match count. The error will be returned only when error occurs while accessing
+	// the database. This is a MANY mode because the first return type is an integer.
+	DeleteByCity(ctx context.Context, city string) (int, error)
+}
+```
+
+### Step 3: Run the repogen
+
+Run this command to generate a repository implementation from the specification.
+
+```
+$ repogen -src=<src_file> -dest=<dest_file> -model=<model_struct> -repo=<repo_interface>
+```
+
+- `<src_file>` is the file that contains struct model and repository interface code
+- `<dest_file>` is the destination path for the repository implementation to be generated
+- `<model_struct>` is the name of the model struct for generating the repository
+- `<repo_interface>` is the name of the repository interface to generate implementation from
+
+For example:
+
+```
+$ repogen -src=examples/getting-started/user.go -dest=examples/getting-started/user_repo.go -model=UserModel -repo=UserRepository
+```
+
+You can also write the above command in the `go:generate` format inside Go files in order to generate the implementation when `go generate` command is executed.

examples/getting-started/main.go

@@ -0,0 +1,95 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+// Replace these values with your own connection option. This connection option is hard-coded for easy
+// demonstration. Make sure not to hard-code the credentials in the production code.
+const (
+	connectionString = "mongodb://lineman:lineman@localhost:27017"
+	databaseName     = "repogen_examples"
+	collectionName   = "gettingstarted_user"
+)
+
+var (
+	userRepository UserRepository
+	userID         primitive.ObjectID
+)
+
+func init() {
+	// create a connection to the database
+	client, err := mongo.NewClient(options.Client().ApplyURI(connectionString))
+	if err != nil {
+		panic(err)
+	}
+	err = client.Connect(context.TODO())
+	if err != nil {
+		panic(err)
+	}
+
+	// instantiate a user repository from the user collection
+	userRepository = NewUserRepository(client.Database(databaseName).Collection(collectionName))
+}
+
+func main() {
+	demonstrateInsertion()
+	demonstrateFind()
+	demonstrateUpdate()
+	demonstrateDelete()
+}
+
+// demonstrateInsertion shows how insert method of repogen works. It receives a model struct and returns
+// an insertedID.
+func demonstrateInsertion() {
+	userModel := &UserModel{
+		Username:    "sunboyy",
+		DisplayName: "SB",
+		City:        "Bangkok, Thailand",
+	}
+
+	insertedID, err := userRepository.InsertOne(context.Background(), userModel)
+	if err != nil {
+		panic(err)
+	}
+	userID = insertedID.(primitive.ObjectID)
+	fmt.Printf("Insert (one): inserted id = %v\n", insertedID)
+}
+
+// demonstrateFind shows how find method in repogen works. It receives query parameters through method
+// arguments and returns matched result
+func demonstrateFind() {
+	userModel, err := userRepository.FindByUsername(context.Background(), "sunboyy")
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("Find (one): found user = %+v\n", userModel)
+}
+
+// demonstrateUpdate shows how update method in repogen works. It receives updates and query parameters
+// through method arguments and returns true/false whether there is a matched query.
+func demonstrateUpdate() {
+	matched, err := userRepository.UpdateDisplayNameByID(context.Background(), "Sunboy", userID)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("Update (one): matched = %v\n", matched)
+}
+
+// demonstrateDelete shows how delete method in repogen works. It receives query parameters through
+// method arguments and returns matched count.
+func demonstrateDelete() {
+	matchedCount, err := userRepository.DeleteByCity(context.Background(), "Bangkok, Thailand")
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("Delete (many): matched count = %d\n", matchedCount)
+}

examples/getting-started/user.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"context"
+
+	"go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+// UserModel is a model of user that is stored in the database
+type UserModel struct {
+	ID          primitive.ObjectID `bson:"_id,omitempty" json:"id"`
+	Username    string             `bson:"username" json:"username"`
+	DisplayName string             `bson:"display_name" json:"displayName"`
+	City        string             `bson:"city" json:"city"`
+}
+
+//go:generate repogen -src=user.go -dest=user_repo.go -model=UserModel -repo=UserRepository
+
+// UserRepository is an interface that describes the specification of querying user data in the database
+type UserRepository interface {
+	// InsertOne stores userModel into the database and returns inserted ID if insertion succeeds
+	// and returns error if insertion fails.
+	InsertOne(ctx context.Context, userModel *UserModel) (interface{}, error)
+
+	// FindByUsername queries user by username. If a user with specified username exists, the user will be
+	// returned. If no user exists or error occurs while querying, error will be returned.
+	FindByUsername(ctx context.Context, username string) (*UserModel, error)
+
+	// UpdateDisplayNameByID updates a user with the specified ID with a new display name. If there is a user
+	// matches the query, it will return true. Error will be returned only when error occurs while accessing
+	// the database. This is a ONE mode because the first return type is a boolean.
+	UpdateDisplayNameByID(ctx context.Context, displayName string, id primitive.ObjectID) (bool, error)
+
+	// DeleteByCity deletes users that have `city` value match the parameter and returns the match count.
+	// The error will be returned only when error occurs while accessing the database. This is a MANY mode
+	// because the first return type is an integer.
+	DeleteByCity(ctx context.Context, city string) (int, error)
+}

examples/getting-started/user_repo.go

@@ -0,0 +1,62 @@
+// Code generated by repogen. DO NOT EDIT.
+package main
+
+import (
+	"context"
+
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+func NewUserRepository(collection *mongo.Collection) UserRepository {
+	return &UserRepositoryMongo{
+		collection: collection,
+	}
+}
+
+type UserRepositoryMongo struct {
+	collection *mongo.Collection
+}
+
+func (r *UserRepositoryMongo) InsertOne(arg0 context.Context, arg1 *UserModel) (interface{}, error) {
+	result, err := r.collection.InsertOne(arg0, arg1)
+	if err != nil {
+		return nil, err
+	}
+	return result.InsertedID, nil
+}
+
+func (r *UserRepositoryMongo) FindByUsername(arg0 context.Context, arg1 string) (*UserModel, error) {
+	var entity UserModel
+	if err := r.collection.FindOne(arg0, bson.M{
+		"username": arg1,
+	}).Decode(&entity); err != nil {
+		return nil, err
+	}
+	return &entity, nil
+}
+
+func (r *UserRepositoryMongo) UpdateDisplayNameByID(arg0 context.Context, arg1 string, arg2 primitive.ObjectID) (bool, error) {
+	result, err := r.collection.UpdateOne(arg0, bson.M{
+		"_id": arg2,
+	}, bson.M{
+		"$set": bson.M{
+			"display_name": arg1,
+		},
+	})
+	if err != nil {
+		return false, err
+	}
+	return result.MatchedCount > 0, err
+}
+
+func (r *UserRepositoryMongo) DeleteByCity(arg0 context.Context, arg1 string) (int, error) {
+	result, err := r.collection.DeleteMany(arg0, bson.M{
+		"city": arg1,
+	})
+	if err != nil {
+		return 0, err
+	}
+	return int(result.DeletedCount), nil
+}

go.mod

@@ -3,6 +3,15 @@ module github.com/sunboyy/repogen
 go 1.15
 
 require (
+	github.com/aws/aws-sdk-go v1.37.3 // indirect
 	github.com/fatih/camelcase v1.0.0
-	golang.org/x/tools v0.0.0-20210115202250-e0d201561e39
+	github.com/golang/snappy v0.0.2 // indirect
+	github.com/klauspost/compress v1.11.7 // indirect
+	go.mongodb.org/mongo-driver v1.4.6
+	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
+	golang.org/x/mod v0.4.1 // indirect
+	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a // indirect
+	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c // indirect
+	golang.org/x/text v0.3.5 // indirect
+	golang.org/x/tools v0.1.0
 )

go.sum

@@ -1,26 +1,155 @@
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