Controller_Data_Mongo::addCondition PHP Method

    public function addCondition($model, $field, $value)
    {
        if ($model->_table[$this->short_name]['conditions'][$field]) {
            throw $this->exception('Multiple conditions on same field not supported yet');
        }
        if ($f = $model->hasElement($field)) {
            if (!is_array($value)) {
                if ($f->type() == 'boolean' && is_bool($value)) {
                    $value = (bool) $value;
                }
                if ($f->type() == 'int') {
                    $value = (int) $value;
                }
                if ($f->type() == 'money' || $f->type() == 'float') {
                    $value = (double) $value;
                }
                if ($f->type() == 'reference_id' && $value && !is_array($value) || $field == $model->id_field) {
                    $value = new MongoID($value);
                }
                $f->defaultValue($value)->system(true);
            }
            // TODO: properly convert to Mongo presentation
        } else {
            if ($field[0] != '$' && strpos($field, '.') === false) {
                throw $this->exception('Condition on undefined field. Does not ' . 'look like expression either')->addMoreInfo('model', $model)->addMoreInfo('field', $field);
            }
        }
        $model->_table[$this->short_name]['conditions'][$field] = $value;
    }