articles-api/service/article/article.go

package article

import (
	"net/http"

	"git.xdrm.io/go/aicra"
	"git.xdrm.io/go/aicra/api"
	"git.xdrm.io/go/tiny-url-ex/service/model"
	"github.com/jinzhu/gorm"
)

// Service to manage users
type Service struct {
	DB *gorm.DB
}

// Wire services to their paths
func (s Service) Wire(server *aicra.Server) error {
	if !s.DB.HasTable(&model.Article{}) {
		s.DB.CreateTable(&model.Article{})
	}

	if err := server.Handle(http.MethodGet, "/articles", s.getAllArticles); err != nil {
		return err
	}
	if err := server.Handle(http.MethodGet, "/user/{id}/articles", s.getArticlesByAuthor); err != nil {
		return err
	}
	if err := server.Handle(http.MethodGet, "/article/{id}", s.getArticleByID); err != nil {
		return err
	}
	if err := server.Handle(http.MethodPost, "/article", s.postArticle); err != nil {
		return err
	}
	if err := server.Handle(http.MethodDelete, "/article/{id}", s.deleteArticle); err != nil {
		return err
	}
	return nil
}

type iByID struct {
	ID uint
}

type oArticle struct {
	ID     uint
	Author uint
	Title  string
	Body   string
	Score  uint
}
type iCreate struct {
	Title string
	Body  string
}

type oArticleList struct {
	Articles []model.Article
}

func (s Service) getArticlesByAuthor(param iByID) (*oArticleList, api.Error) {
	articles := make([]model.Article, 0)
	s.DB.Where("author = ?", param.ID).Find(&articles)
	return &oArticleList{
		Articles: articles,
	}, api.ErrorSuccess
}

func (s Service) getAllArticles() (*oArticleList, api.Error) {
	articles := make([]model.Article, 0)
	s.DB.Find(&articles)
	return &oArticleList{
		Articles: articles,
	}, api.ErrorSuccess
}

func (s Service) getArticleByID(param iByID) (*oArticle, api.Error) {
	var article model.Article
	if s.DB.First(&article, param.ID).RecordNotFound() {
		return nil, api.ErrorNoMatchFound
	}

	return &oArticle{
		ID:     article.ID,
		Title:  article.Title,
		Body:   article.Body,
		Author: article.Author,
	}, api.ErrorSuccess
}

func (s Service) postArticle(param iCreate) (*oArticle, api.Error) {
	return nil, api.ErrorNotImplemented
}

func (s Service) deleteArticle(param iByID) api.Error {
	article := model.Article{
		ID: param.ID,
	}
	s.DB.Delete(&article)

	return api.ErrorSuccess
}