How to implementing beforeDestroy methods in SailsJS? - node.js

Question

I'm new using sails JS.
I have methods like this
beforeDestroy: function(borrow, next){
return Book.find({id:borrow.product})
.then(function(){
Book.update(borrow.product, {'isBorrowed' : false})
})
.then(function(){
next();
})
.catch(function(error){
next(error);
});
}
When I tried to destroy data book 'IsBorrowed' still true, how to fix this when tried t delete data, firstly find id and secondly, change data book IsBorrowed to be false? Thank Advance

Answer 1

Here is a solution (to your original question - just switch the isBorrowed logic around as you now need it):
book.js
module.exports = {
schema: true,
attributes: {
name: {type: 'string', required: true},
desc: {type: 'text'},
isBorrowed: {type: 'boolean', defaultsTo: false}
}
};
bookBorrowed.js
module.exports = {
schema: true,
attributes: {
book: {model: 'Book'}
},
beforeDestroy: function (criteria, next) {
var bookId = criteria.where.id;
console.log(bookId);
Book.update({id: bookId}, {isBorrowed: true})
.exec(function (err, updatedBook) {
if (err) {
next('no book..');
}
console.log('updated book', updatedBook);
next();
});
}
};
Your problem was that you should consider the relationship with id, not object.
Also, the criteria parameter passed into beforeDestroy has a where object, it isn't the model. Also, the update() function takes an object criteria, see above.
If you wish to test, replace your bootstrap.js with the following snippet:
module.exports.bootstrap = function (cb) {
var bk = {name: 'name', desc: 'desc', isBorrowed: false};
Book.create(bk).exec(function (err, book) {
if (err) {
cb(err);
}
console.log('book: ', book);
var bb = {book: book.id};
BookBorrowed.create(bb).exec(function (err, bkBorrowed) {
if (err) {
cb(err);
}
console.log('bkBorrowed: ', bkBorrowed);
BookBorrowed.destroy({id: bkBorrowed.id}).exec(function (err, bkBorrowed) {
if (err) {
cb(err);
}
cb();
});
})
});
};