/**
     * Check if an attribute value exists for a specific field in a specific partition
     *
     * @param   {object}    data                Object with partition/field/value
     * @param   {function}  callback            Callback to fire (or a promise is returned)
     * @var     {string}    data.partitionId    Partition ID to query
     * @var     {Mixed}     data.value          Value to check
     * @var     {string}    data.field          Field being validated
     * @returns {Promise}
     */
    assetSchema.statics.doesAttrValueExist = function( data, callback ) {

    }