Looking to populate a set of Child records from CI relationship table in the catalog variable.

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I want to populate a set of Child records from the CI Relationship table in a "Reference" type catalog variable. There is a "Application Name" variable on a catalog form referring to Parent field of CI Relationship table and there is another catalog variable "Database" referring to "Child" field of CI relationship table. I need all the child values in "Database" field corresponding to the values selected in "Application Name" field. One Parent has multiple associated child in CI Relationship table. I created a script include to use in reference qualifier for "Database" field to meet the requirements but its giving me all the Child records and i need only specific to the values selected in "Application Name" field.

Reference Qualifier:  javascript: new OracleParent().findRelationships(current.variables.application_name)

Script Include:  

var OracleParent = Class.create();

OracleParent.prototype = {

    initialize: function() {

    },

    findRelationships: function(parent)

    {

        if(parent == "")

        {

            return "sys_idIN0000000000";

        }

        var rel = new GlideRecord('cmdb_rel_ci');

        var arrRel = [];

        rel.addQuery('parent', parent);

        rel.query();

        while(rel.next())

        {

                        arrRel.push(rel.sys_id.toString());

        }

        var ans = "parent.nameIN";

        for(var a = 0; a < arrRel.length; a++)

        {

            if(a > 0)

            ans = ans + ",";

            ans = ans + arrRel[a];

        }

        return ans;

    },

    type: 'OracleParent'

};