Overriding mongoose query for a specific model

Question

I want to automatically add a query option for all queries related for a specific mongoose model without affecting other models

I saw this answer where Mongoose.Query is patched and that will affect all mongoose models.

Alex · Accepted Answer · 2015-06-23 15:09:23Z

6

I was able to do this for my soft deleted items. Haven't tested it extensively yet though.

function findNotDeletedMiddleware(next) {
    this.where('deleted').equals(false);
    next();
}

MySchema.pre('find', findNotDeletedMiddleware);
MySchema.pre('findOne', findNotDeletedMiddleware);
MySchema.pre('findOneAndUpdate', findNotDeletedMiddleware);
MySchema.pre('count', findNotDeletedMiddleware);

edited Jun 23, 2015 at 15:09

answered Jun 22, 2015 at 10:58

Alex

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Mattias Farnemyhr · Accepted Answer · 2014-09-15 18:09:36Z

5

I see two possible easy ways to do this:

Alternative #1

Add a static dict with the options you want to be applied to your specific Mongoose schema:

FooSchema.statics.options = {
    ...
};

Now, when you query you need to do:

Foo.find({}, null, Foo.options, function(err, foos) {
    ...
});

Alternative #2

Implement a wrapper to the find method that always uses your specific options:

FooSchema.statics.findWithOptions = function(query, next) {
    var options = { ... };
    this.find(query, null, options, next);
};

And use this method like so:

Foo.findWithOptions({}, function(err, foos) {
    ...
})

Reusability

To make these wrapper methods more reusable, you can make a dict with all your wrappers:

var withOptionsWrappers = {
    findWithOptions: function(query, next) {
        this.find(query, null, this.options, next);
    },
    findByIdWithOptions: ...
    findOneWithOptions: ...
    ...
};

Since we're referring to this there will be no problem reusing this. And now have this be applied to all your schemas along with your schema specific options:

FooSchema.statics = withOptionsWrappers;
FooSchema.statics.options = {
    ...
};
BarSchema.statics = withOptionsWrappers;
BarSchema.statics.options = {
    ...
};

edited Sep 15, 2014 at 18:09

answered Sep 15, 2014 at 15:06

Mattias Farnemyhr

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2 Comments

eyadof Over a year ago

Thank you for the answer but actually i want to add this option to all queries (find,findById,update,remove...) so i need to create wrapper for each query for each model !

Mattias Farnemyhr Over a year ago

@eyadof added a section in my answer that gives a suggestion how you can reuse it.

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