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Programming language: Go
License: MIT License
Tags: Utilities    
Latest version: v1.0.2

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README

Build Status Coverage Status GoDoc Go Report Card GitHub license

Package tome was designed to paginate simple RESTful APIs.

Installation

go get -u github.com/cyruzin/tome

Usage

To get started, import the tome package and initiate the pagination:

import "github.com/cyruzin/tome"

// Post type is a struct for a single post.
type Post struct {
    Title string `json:"title"`
    Body  string `json:"body"`
}

// Posts type is a struct for multiple posts.
type Posts []*Post

// Result type is a struct of posts with pagination.
type Result struct {
    Data *Posts `json:"data"`
    *tome.Chapter
}

// GetPosts gets the latest 10 posts with pagination.
func GetPosts(w http.ResponseWriter, r *http.Request) {
    // Creating a tome chapter with links.
    chapter := &tome.Chapter{
        // Setting base URL.
        BaseURL: "http://yourapi.com/v1/posts",
        // Enabling link results.
        Links: true,
        // Page that you captured in params inside you handler.
        NewPage: 2,
        // Total of pages, this usually comes from a SQL query total rows result.
        TotalResults: model.GetPostsTotalResults(),
    }

    // Paginating the results.
    if err := chapter.Paginate(); err != nil { 
        w.WriteHeader(http.StatusUnprocessableEntity)  // Setting status 422.
            json.NewEncoder(w).Encode(err) // Returning JSON with an error.
        return
    }

    // Here you pass the offset and limit.
    database, err := model.GetPosts(chapter.Offset, chapter.Limit)
    if err != nil {
        w.WriteHeader(http.StatusUnprocessableEntity)  // Setting status 422.
            json.NewEncoder(w).Encode(err) // Returning JSON with an error.
        return
    }

    // Mocking results with pagination.
    res := &Result{Data: database, Chapter: chapter}

    w.WriteHeader(http.StatusOK)  // Setting status 200.
    json.NewEncoder(w).Encode(res) // Returning success JSON.
}

Output: 

{
 "data": [
  {
   "title": "What is Lorem Ipsum?",
   "body": "Lorem Ipsum is simply dummy text of the printing and..."
  },
  {
   "title": "Why do we use it?",
   "body": "It is a long established fact that a reader will be..."
  }
 ],
 "base_url": "http://yourapi.com/v1/posts",
 "next_url": "http://yourapi.com/v1/posts?page=3",
 "prev_url": "http://yourapi.com/v1/posts?page=1",
 "per_page": 10,
 "current_page": 2,
 "last_page": 30,
 "total_results": 300
}

Performance

Without links:

Iterations ns/op B/op allocs/op
200000000 7.80 0 0

With links:

Iterations ns/op B/op allocs/op
10000000 133 96 2


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