Symfony十进制数范围（含99）验证的小数兼容问题

First, let's break down the root issue: The in 8..39 syntax in Symfony's Expression Language checks if the value is part of an integer sequence from 8 to 39, not a continuous numerical range. That's why decimal values like 8.5 are failing—they aren't integers in that sequence, so the expression returns false.

Here's a simple, regex-free fix: Replace the range operator with explicit numerical comparisons using >= and <=, which properly evaluate the actual numerical value of your decimal field, regardless of whether it's stored as a string (per Doctrine's decimal mapping) or a float:

/**
 * @var decimal
 * @Assert\Expression(
 *     "this.getFu5Weight() >= 8 and this.getFu5Weight() <= 39 or this.getFu5Weight() == 99",
 *     message="3. Weight at assessment: this value has to be between 8 and 39, or 99 if unknown"
 * )
 */
private $fu5Weight;

Why this works: #

• Unlike in 8..39, the >=/<= operators check the numerical value, not just integer membership. This validates all valid decimal values in the 8–39 range (e.g., 8.00, 15.75, 39.00) without issue.
• The check for == 99 will also work with decimal-formatted values like 99.00, since Symfony's Expression Language handles automatic conversion between string-based decimals and numeric values.

Quick additional notes: #

• Your form's invalid_message is still relevant—it catches non-numeric input (like text), which is separate from the range validation handled by the @Assert\Expression.
• If you need to strictly enforce 99.00 (instead of accepting 99 as an integer), you can adjust the check to this.getFu5Weight() == 99.00 to match your Doctrine mapping's scale: 2 setting.

内容的提问来源于stack exchange，提问作者Baby Webmaster