Won't install on Laravel 5.8, will on 5.7

[rileymccullagh]

I'm getting some kind of dependency resolution error on Laravel 5.8

composer require rinvex/laravel-attributes

Using version ^1.0 for rinvex/laravel-attributes
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: remove laravel/framework v5.8.18
    - Conclusion: don't install laravel/framework v5.8.18
    - rinvex/laravel-attributes v1.0.0 requires illuminate/support ~5.7.0 -> satisfiable by laravel/framework[5.7.x-dev], illuminate/support[5.7.17, 5.7.18, 5.7.19, 5.7.x-dev, v5.7.0, v5.7.1, v5.7.10, v5.7.11, v5.7.15, v5.7.2, v5.7.20, v5.7.21, v5.7.22, v5.7.23, v5.7.26, v5.7.27, v5.7.28, v5.7.3, v5.7.4, v5.7.5, v5.7.6, v5.7.7, v5.7.8, v5.7.9].
    - rinvex/laravel-attributes v1.0.1 requires illuminate/support ~5.7.0 -> satisfiable by laravel/framework[5.7.x-dev], illuminate/support[5.7.17, 5.7.18, 5.7.19, 5.7.x-dev, v5.7.0, v5.7.1, v5.7.10, v5.7.11, v5.7.15, v5.7.2, v5.7.20, v5.7.21, v5.7.22, v5.7.23, v5.7.26, v5.7.27, v5.7.28, v5.7.3, v5.7.4, v5.7.5, v5.7.6, v5.7.7, v5.7.8, v5.7.9].
    - Can only install one of: laravel/framework[5.7.x-dev, v5.8.18].
    - don't install illuminate/support 5.7.17|don't install laravel/framework v5.8.18
    - don't install illuminate/support 5.7.18|don't install laravel/framework v5.8.18
    - don't install illuminate/support 5.7.19|don't install laravel/framework v5.8.18
    - don't install illuminate/support 5.7.x-dev|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.0|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.1|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.10|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.11|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.15|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.2|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.20|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.21|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.22|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.23|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.26|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.27|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.28|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.3|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.4|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.5|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.6|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.7|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.8|don't install laravel/framework v5.8.18
    - don't install illuminate/support v5.7.9|don't install laravel/framework v5.8.18
    - Installation request for laravel/framework (locked at v5.8.18, required as 5.8.*) -> satisfiable by laravel/framework[v5.8.18].
    - Installation request for rinvex/laravel-attributes ^1.0 -> satisfiable by rinvex/laravel-attributes[v1.0.0, v1.0.1].

Installation failed, reverting ./composer.json to its original content.

Here is my composer.json

{
    "name": "laravel/laravel",
    "type": "project",
    "description": "The Laravel Framework.",
    "keywords": [
        "framework",
        "laravel"
    ],
    "license": "MIT",
    "require": {
        "php": "^7.1.3",
        "fideloper/proxy": "^4.0",
        "jeremykenedy/laravel-users": "^3.4",
        "laravel/framework": "5.8.*",
        "laravel/tinker": "^1.0",
        "wildside/userstamps": "^0.5.5"
    },
    "require-dev": {
        "beyondcode/laravel-dump-server": "^1.0",
        "filp/whoops": "^2.0",
        "fzaninotto/faker": "^1.4",
        "mockery/mockery": "^1.0",
        "nunomaduro/collision": "^3.0",
        "phpunit/phpunit": "^7.5"
    },
    "config": {
        "optimize-autoloader": true,
        "preferred-install": "dist",
        "sort-packages": true
    },
    "extra": {
        "laravel": {
            "dont-discover": []
        }
    },
    "autoload": {
        "psr-4": {
            "App\\": "app/"
        },
        "classmap": [
            "database/seeds",
            "database/factories"
        ]
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "minimum-stability": "dev",
    "prefer-stable": true,
    "scripts": {
        "post-autoload-dump": [
            "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
            "@php artisan package:discover --ansi"
        ],
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "@php artisan key:generate --ansi"
        ]
    }
}

[jlstandout]

For me it works well. As I can see for some reason it tries to install version 1.0, but latest is v.2.1. You can try to add "rinvex/laravel-attributes": "^2.1" to your composer.json under require. Than it should work fine.

[Omranic]

v4.x is compatible with Laravel v7.x v3.x is compatible with Laravel v6.x v2.x is compatible with Laravel v5.8 v1.x is compatible with Laravel v5.7