I have
Page.findById(pageId).then(page => {
const pageId = page.id;
..
});
My problem is that if no page id is given, it should just take the first available page given some conditions, which is done by
Page.findOne({}).then(page => {
const pageId = page.id;
..
});
but if no page is found, it should create a new page and use this, which is done with
Page.create({}).then(page => {
const pageId = page.id;
..
});
But how do I combine all this to as few lines as possible?
I have a lot of logic going on inside
page => { ... }
so I would very much like to do this smart, so I can avoid doing it like this
if (pageId) {
Page.findById(pageId).then(page => {
const pageId = page.id;
..
});
} else {
Page.findOne({}).then(page => {
if (page) {
const pageId = page.id;
..
} else {
Page.create({}).then(page => {
const pageId = page.id;
..
});
}
});
}
I am thinking I maybe could assign a static to the schema with something like
pageSchema.statics.findOneOrCreate = function (condition, doc, callback) {
const self = this;
self.findOne(condition).then(callback).catch((err, result) => {
self.create(doc).then(callback);
});
};
As per the Mongoose docs:
As per previous SO answer
Model.findByIdAndUpdate()
"Finds a matching document, updates it according to the update arg, passing any options, and returns the found document (if any) to the callback."
In the options set upsert to true:
upsert: bool - creates the object if it doesn't exist. defaults to false.
Model.findByIdAndUpdate(id, { $set: { name: 'SOME_VALUE' }}, { upsert: true }, callback)