CODEWITHSUNDEEP
javascriptarraysnode.jsmongodbmongoose
LinDan ChongWei
LinDan ChongWei

Reputation: 193

mongoose validation matching an array with another array for common string?

My mongoose Schema + validation

var schemaInterest = new schema({

  active_elements: {
    type: [String]
    },

  pending_elements: {
  type:[String]
  }


});

schemaInterest.methods.matchElements = function matchElements() {
  this.find({active_elements: this.pending_elements}, function(){
    //shows all the matched elements
  });
};

I don't know how to work with error handling in mongoose yet. I want it so that if the elements match an error will be return if there is no match then the validation is successful. Any ideas?

Upvotes: 1

Views: 626

Answers (1)

chridam
chridam

Reputation: 103335

Try adding the other property in your validation by using this.pending_elements and comparing the arrays using the lodash library's _.isEqual() and _.sortBy() methods:

var schemaInterest = new schema({  
    active_elements: {
        type: [String]
    },
    pending_elements: {
        type: [String]
    }
});

schemaInterest.path('active_elements').validate(function (v) {
    return _.isEqual(_.sortBy(v), _.sortBy(this.pending_elements))  
}, 'my error type');

-- UPDATE --

From the OP comments (thanks to @JohnnyHK for pointing that out), at least one matching element, not the whole array is required thus you would need the _.intersection() method which creates an array of unique values that are included in all of the provided arrays using SameValueZero for equality comparisons:

_.intersection(v, this.pending_elements)

would suffice. Thus your validation function would look like this:

schemaInterest.path('active_elements').validate(function (v) {
    return _.intersection(v, this.pending_elements).length > 0  
}, 'my error type');

Upvotes: 2

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