ActiveRecord\Validations::validates_numericality_of PHP Method

    public function validates_numericality_of($attrs)
    {
        $configuration = array_merge(self::$DEFAULT_VALIDATION_OPTIONS, array('only_integer' => false));
        // Notice that for fixnum and float columns empty strings are converted to nil.
        // Validates whether the value of the specified attribute is numeric by trying to convert it to a float with Kernel.Float
        // (if only_integer is false) or applying it to the regular expression /\A[+\-]?\d+\Z/ (if only_integer is set to true).
        foreach ($attrs as $attr) {
            $options = array_merge($configuration, $attr);
            $attribute = $options[0];
            $var = $this->model->{$attribute};
            $numericalityOptions = array_intersect_key(self::$ALL_NUMERICALITY_CHECKS, $options);
            if ($this->is_null_with_option($var, $options)) {
                continue;
            }
            $not_a_number_message = isset($options['message']) ? $options['message'] : Errors::$DEFAULT_ERROR_MESSAGES['not_a_number'];
            if (true === $options['only_integer'] && !is_integer($var)) {
                if (!preg_match('/\\A[+-]?\\d+\\Z/', (string) $var)) {
                    $this->record->add($attribute, $not_a_number_message);
                    continue;
                }
            } else {
                if (!is_numeric($var)) {
                    $this->record->add($attribute, $not_a_number_message);
                    continue;
                }
                $var = (double) $var;
            }
            foreach ($numericalityOptions as $option => $check) {
                $option_value = $options[$option];
                $message = isset($options['message']) ? $options['message'] : Errors::$DEFAULT_ERROR_MESSAGES[$option];
                if ('odd' != $option && 'even' != $option) {
                    $option_value = (double) $options[$option];
                    if (!is_numeric($option_value)) {
                        throw new ValidationsArgumentError("{$option} must be a number");
                    }
                    $message = str_replace('%d', $option_value, $message);
                    if ('greater_than' == $option && !($var > $option_value)) {
                        $this->record->add($attribute, $message);
                    } elseif ('greater_than_or_equal_to' == $option && !($var >= $option_value)) {
                        $this->record->add($attribute, $message);
                    } elseif ('equal_to' == $option && !($var == $option_value)) {
                        $this->record->add($attribute, $message);
                    } elseif ('less_than' == $option && !($var < $option_value)) {
                        $this->record->add($attribute, $message);
                    } elseif ('less_than_or_equal_to' == $option && !($var <= $option_value)) {
                        $this->record->add($attribute, $message);
                    }
                } else {
                    if ('odd' == $option && !Utils::is_odd($var) || 'even' == $option && Utils::is_odd($var)) {
                        $this->record->add($attribute, $message);
                    }
                }
            }
        }
    }