在猫鼬中保存一对多的关系双方

Question

I am very new to MongoDB and am using Mongoose.

I have two models: users and recipes .

User :

recipes: [{
    type: Schema.Types.ObjectId,
    ref: 'recipes'
}],

Recipe :

_creator: {
    type: Schema.Types.ObjectId,
    ref: 'User',
    childPath: "recipes"
},

When I try to save a recipe and I assign the user to a recipe:

var recipe = new models.Recipe({
        title: req.body.title,
        slug: req.body.slug,
        _creator: user._id
    });

    recipe.save();

The recipe gets saved just fine ( even though I am not able to do recipe._creator.name to get the user name from the recipe ). But if I try to get the user details, the recipes array is empty. I would expect that it was filled with the newly created recipe reference. Why is it not?

Answer 1

if i understand correctly one creator has many recipes. right ? in that case your creator should recipes should reference have a reference to creator that's it.

if you examine closely in recipes you are doing a ref on recipes itself

{ recipes: [{
    type: Schema.Types.ObjectId,
    ref: 'recipes'
}],

}

instead you should do

{
    { recipes: [{
        type: Schema.Types.ObjectId,
        ref: 'user'
    }],
}

why in your user model you have a reference to user itself ? that seems not right.

check for an example i posted on Mongodb and Express

Answer 2

I had the same issue, what I had done to resolve this was updating both documents with the corresponding reference

 var recipe = new models.Recipe({ title: req.body.title, slug: req.body.slug, _creator: user._id }); recipe.save((err) => { if (err) { console.log(err); } user.recipes.push(recipe); user.save(); });