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Programming language: Go
License: MIT License
Tags: Utilities    

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README

Golang Mongo Pagination For Package mongo-go-driver

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For all your simple query to aggregation pipeline this is simple and easy to use Pagination driver with information like Total, Page, PerPage, Prev, Next, TotalPage and your actual mongo result.

Install

$ go get -u -v github.com/gobeam/mongo-go-pagination

or with dep

$ dep ensure -add github.com/gobeam/mongo-go-pagination

For Aggregation Pipelines Query

package main

import (
    "context"
    "fmt"
    . "github.com/gobeam/mongo-go-pagination"
    "go.mongodb.org/mongo-driver/bson"
    "go.mongodb.org/mongo-driver/bson/primitive"
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
    "time"
)

type Product struct {
    Id       primitive.ObjectID `json:"_id" bson:"_id"`
    Name     string             `json:"name" bson:"name"`
    Quantity float64            `json:"qty" bson:"qty"`
    Price    float64            `json:"price" bson:"price"`
}

func main() {
    // Establishing mongo db connection
    ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
    client, err := mongo.Connect(ctx, options.Client().ApplyURI("mongodb://localhost:27017"))
    if err != nil {
        panic(err)
    }

    var limit int64 = 10
    var page int64 = 1
    collection := client.Database("myaggregate").Collection("stocks")

    //Example for Aggregation

    //match query
    match := bson.M{"$match": bson.M{"qty": bson.M{"$gt": 10}}}

    //group query
    projectQuery := bson.M{"$project": bson.M{"_id": 1, "qty": 1}}

    // you can easily chain function and pass multiple query like here we are passing match
    // query and projection query as params in Aggregate function you cannot use filter with Aggregate
    // because you can pass filters directly through Aggregate param
    aggPaginatedData, err := New(collection).Limit(limit).Page(page).Sort("price", -1).Aggregate(match, projectQuery)
    if err != nil {
        panic(err)
    }

    var aggProductList []Product
    for _, raw := range aggPaginatedData.Data {
        var product *Product
        if marshallErr := bson.Unmarshal(raw, &product); marshallErr == nil {
            aggProductList = append(aggProductList, *product)
        }

    }

    // print ProductList
    fmt.Printf("Aggregate Product List: %+v\n", aggProductList)

    // print pagination data
    fmt.Printf("Aggregate Pagination Data: %+v\n", aggPaginatedData.Data)
}

For Normal queries



func main() {
    // Establishing mongo db connection
    ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
    client, err := mongo.Connect(ctx, options.Client().ApplyURI("mongodb://localhost:27017"))
    if err != nil {
        panic(err)
    }

    // Example for Normal Find query
        filter := bson.M{}
        var limit int64 = 10
        var page int64 = 1
        collection := client.Database("myaggregate").Collection("stocks")
        projection := bson.D{
            {"name", 1},
            {"qty", 1},
        }
        // Querying paginated data
        // Sort and select are optional
        paginatedData, err := New(collection).Limit(limit).Page(page).Sort("price", -1).Select(projection).Filter(filter).Find()
        if err != nil {
            panic(err)
        }

        // paginated data is in paginatedData.Data
        // pagination info can be accessed in  paginatedData.Pagination
        // if you want to marshal data to your defined struct

        var lists []Product
        for _, raw := range paginatedData.Data {
            var product *Product
            if marshallErr := bson.Unmarshal(raw, &product); marshallErr == nil {
                lists = append(lists, *product)
            }

        }
        // print ProductList
        fmt.Printf("Norm Find Data: %+v\n", lists)

        // print pagination data
        fmt.Printf("Normal find pagination info: %+v\n", paginatedData.Pagination)
}

Running the tests

$ go test

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

Acknowledgments

https://github.com/mongodb/mongo-go-driver

MIT License

Copyright (c) 2020


*Note that all licence references and agreements mentioned in the mongo-go-pagination README section above are relevant to that project's source code only.