Merge pull request #13 from sunboyy/getting-started

Create a getting started document and example
This commit is contained in:
sunboyy 2021-02-04 22:10:19 +07:00 committed by GitHub
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6 changed files with 397 additions and 4 deletions

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@ -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.

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@ -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)
}

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@ -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)
}

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@ -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
}

11
go.mod
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@ -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
)

135
go.sum
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@ -1,26 +1,155 @@
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/aws/aws-sdk-go v1.34.28/go.mod h1:H7NKnBqNVzoTJpGfLrQkkD+ytBA93eiDYi/+8rV9s48=
github.com/aws/aws-sdk-go v1.37.3 h1:1f0groABc4AuapskpHf6EBRaG2tqw0Sx3ebCMwfp1Ys=
github.com/aws/aws-sdk-go v1.37.3/go.mod h1:hcU610XS61/+aQV88ixoOzUoG7v3b31pl2zKMmprdro=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/fatih/camelcase v1.0.0 h1:hxNvNX/xYBp0ovncs8WyWZrOrpBNub/JfaMvbURyft8=
github.com/fatih/camelcase v1.0.0/go.mod h1:yN2Sb0lFhZJUdVvtELVWefmrXpuZESvPmqwoZc+/fpc=
github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
github.com/go-stack/stack v1.8.0 h1:5SgMzNM5HxrEjV0ww2lTmX6E2Izsfxas4+YHWRs3Lsk=
github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
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github.com/gobuffalo/depgen v0.1.0/go.mod h1:+ifsuy7fhi15RWncXQQKjWS9JPkdah5sZvtHc2RXGlg=
github.com/gobuffalo/envy v1.6.15/go.mod h1:n7DRkBerg/aorDM8kbduw5dN3oXGswK5liaSCx4T5NI=
github.com/gobuffalo/envy v1.7.0/go.mod h1:n7DRkBerg/aorDM8kbduw5dN3oXGswK5liaSCx4T5NI=
github.com/gobuffalo/flect v0.1.0/go.mod h1:d2ehjJqGOH/Kjqcoz+F7jHTBbmDb38yXA598Hb50EGs=
github.com/gobuffalo/flect v0.1.1/go.mod h1:8JCgGVbRjJhVgD6399mQr4fx5rRfGKVzFjbj6RE/9UI=
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github.com/gobuffalo/gogen v0.1.0/go.mod h1:8NTelM5qd8RZ15VjQTFkAW6qOMx5wBbW4dSCS3BY8gg=
github.com/gobuffalo/gogen v0.1.1/go.mod h1:y8iBtmHmGc4qa3urIyo1shvOD8JftTtfcKi+71xfDNE=
github.com/gobuffalo/logger v0.0.0-20190315122211-86e12af44bc2/go.mod h1:QdxcLw541hSGtBnhUc4gaNIXRjiDppFGaDqzbrBd3v8=
github.com/gobuffalo/mapi v1.0.1/go.mod h1:4VAGh89y6rVOvm5A8fKFxYG+wIW6LO1FMTG9hnKStFc=
github.com/gobuffalo/mapi v1.0.2/go.mod h1:4VAGh89y6rVOvm5A8fKFxYG+wIW6LO1FMTG9hnKStFc=
github.com/gobuffalo/packd v0.0.0-20190315124812-a385830c7fc0/go.mod h1:M2Juc+hhDXf/PnmBANFCqx4DM3wRbgDvnVWeG2RIxq4=
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github.com/gobuffalo/packr/v2 v2.0.9/go.mod h1:emmyGweYTm6Kdper+iywB6YK5YzuKchGtJQZ0Odn4pQ=
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github.com/golang/snappy v0.0.2 h1:aeE13tS0IiQgFjYdoL8qN3K1N2bXXtI6Vi51/y7BpMw=
github.com/golang/snappy v0.0.2/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg=
github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo=
github.com/jmespath/go-jmespath/internal/testify v1.5.1 h1:shLQSRRSCCPj3f2gpwzGwWFoC7ycTf1rcQZHOlsJ6N8=
github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U=
github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
github.com/karrick/godirwalk v1.8.0/go.mod h1:H5KPZjojv4lE+QYImBI8xVtrBRgYrIVsaRPx4tDPEn4=
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github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
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github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
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github.com/tidwall/pretty v1.0.0/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
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golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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