Field Validation

//Redefining the base function initiating custom validators
setValidationConfig: function () {
    //Calls the initialization of validators for the parent view model
    this.callParent(arguments);
    //Adds the cpfValidator method for the [UsrCPF] column
    this.addColumnValidator("UsrCPF", this.cpfValidator);
},
//Checks if the CPF is valid
cpfValidator: function () {
    //Variable for storing a validation error message.
    invalidMessage = "";
   
    //Gets the Contact's CPF
    var cpf = this.get("UsrCPF");
   
    if (cpf != null && cpf != "")
    {
        //Creates a query for Contact
        var select = Ext.create("Terrasoft.EntitySchemaQuery", {
            rootSchemaName: "Contact"
        });
       
        //First filter (CPF)
        var selectFirstFilter = select.createColumnFilterWithParameter(Terrasoft.ComparisonType.EQUAL, "UsrCPF", cpf);
       
        //Second filter (ID)
        var selectSecondFilter = select.createColumnFilterWithParameter(Terrasoft.ComparisonType.NOT_EQUAL, "Id", this.get("Id"));
       
        //Logical operator to be used between the filters
        select.filters.logicalOperation = Terrasoft.LogicalOperatorType.AND;
       
        //Adds the created filters to the collection
        select.filters.add("selectFirstFilter", selectFirstFilter);
        select.filters.add("selectSecondFilter", selectSecondFilter);
       
        //Executes the query
        select.execute(function (response) {
            if (response.success) {
                //Checks if there's more than one Contact with the given CPF
                if (response.collection.getCount() > 0) {
                    //Console message for log
                    console.log(" CPF: " + cpf +
                                " Total: " + response.collection.getCount());
                    invalidMessage = this.get("Resources.Strings.CpfAlreadyExists");
                }
            }
        }, this);
    }
   
    //If the validation is successful, empty strings are returned to the object
    return {
        //Validation error message displayed in the data window when saving a page
        fullInvalidMessage: invalidMessage,
        //Validation error message displayed under the control item
        invalidMessage: invalidMessage
    };
}