[5.5] MassAssignmentException JSON error output not explicit for non-fillable fields

[rgehan]

• Laravel Version: 5.5.2
• PHP Version: PHP 7.1.3 (cli) (built: Apr 4 2017 18:40:27) ( NTS )
• Database Driver & Version: 10.1.19-MariaDB

Description:

When using Model::create, if a non-fillable field is used, an error is returned.
The standard HTML output tells it is a MassAssignmentException which is quite explicit.
However when expecting a JSON response, the error output is unclear. It looks like that:

{
    "message": "title",
    "file": "/Users/rgehan/Sites/laravel-preset-react/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php",
    "line": 237,
    "trace": [
        {
            "file": "/Users/rgehan/Sites/laravel-preset-react/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php",
            "line": 157,
            "function": "fill",
            "class": "Illuminate\\Database\\Eloquent\\Model",
            "type": "->",
            "args": [
                {
                    "title": "This is the title",
                    "content": "Etiam natoque fusce dis euismod dolor condimentum egestas parturient fermentum, sociis habitasse libero nam adipiscing cubilia scelerisque enim dignissim pulvinar, aliquam ad convallis in mollis quisque proin praesent."
                }
            ]
        },
        {
            "file": "/Users/rgehan/Sites/laravel-preset-react/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php",
            "line": 280,
            "function": "__construct",
            "class": "Illuminate\\Database\\Eloquent\\Model",
            "type": "->",
            "args": [
                {
                    "title": "This is the title",
                    "content": "Etiam natoque fusce dis euismod dolor condimentum egestas parturient fermentum, sociis habitasse libero nam adipiscing cubilia scelerisque enim dignissim pulvinar, aliquam ad convallis in mollis quisque proin praesent."
                }
            ]
        },

        ...

Nothing say in this error that it is a MassAssignmentException. The titlefield of the output is simply the field that is not fillable.

Steps To Reproduce:

• Create a model with a field that is not fillable
• Attempts to Model::create(['not_fillable_field' => 'abc', ...]); from a request with the header: Accept: application/json

[themsaid]

Here's an attempt to make it look more informative: #21043

[rgehan]

Thanks 👍