medium-post-simple-rest-07

index.js

app.delete('/book/:isbn',[
    //Set form validation rule
    check('isbn')
        .isLength({ min: 5 })
        .isNumeric()
        .custom(value => {
            return book.findOne({where: {isbn: value}}).then(b => {
                if(!b){
                    throw new Error('ISBN not found');
                }            
            })
        }
    ),
], (req, res) => {
    book.destroy({where: {isbn: req.params.isbn}})
        .then(affectedRow => {
            if(affectedRow){
                return {
                    "status":"success",
                    "message": "Book deleted",
                    "data": null
                } 
            }

            return {
                "status":"error",
                "message": "Failed",
                "data": null
            } 
                
        })
        .then(r => {
            res.json(r)
        })
})