Laravel validation rule size validation error even though the number of characters matches

Aug 29, 2020 PHP Beginner Laravel For Beginners Laravel7

Purpose

Summarize the problem that an error occurs even if it matches with the number of characters specified in the validation rule “size” while implementing validation

Implementation environment

Hardware environment

Item	Information
OS	macOS Catalina(10.15.5)
Hardware	MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports)
Processor	2 GHz Quad Core Intel Core i5
Memory	32 GB 3733 MHz LPDDR4
Graphics	Intel Iris Plus Graphics 1536 MB

Software environment

Item	Information	Remarks
PHP version	7.4.3	Introduced using Homwbrew
Laravel version	7.0.8	Introduced by this method using commposer → Construct environment of Mac Laravel
MySQL version	8.0.19 for osx10.13 on x86_64	Introduced by this method using Homwbrew → Install MySQL with Mac Homebrew

Problem code

I wrote a process to check the postal code data sent from the view file in the process of saving the postal code.

Describe the processing of the action part of the controller file on the data receiving side. (The view file is processed to output a validation error.)

public function update(Request $request)
{
    // Enter validation rules
    $rules = [
        // Validation rule to confirm that the input postal code data is "not empty" "is a number" "character length is 7 characters"
        'postal_code' => ['required','integer','size:7'],
    ]

    // validation check
    $this->validate($request, $rules);
      
    return redirect(route('home'));
}

A validation error saying “The postal code must be 7.” was output to the view file.
It is a validation error that the number of characters is not 7.

Cause

I made a mistake in specifying the validation rules.
“There is another validation rule that specifies that the field is numeric and the number of digits in the value is specified.
digits: rules can be described.

solution

It is necessary to modify the description part of the validation rule as follows.
By describing as follows, the rule that the input data is “not empty” and “the number of digits is 7” can be defined.
```
    $rules = [
        'postal_code' => ['required','digits:7'],
    ]
```