{"record":{"id":"3f4ca1269f068e13","repo":"flarum/framework","slug":"could-not-generate-url-for-route-routename-no-value-provided","errorCode":null,"errorMessage":"Could not generate URL for route '$routeName': no value provided for required part '$part[0]'.","messagePattern":"Could not generate URL for route '\\$routeName': no value provided for required part '\\$part\\[0\\]'\\.","errorType":"exception","errorClass":"InvalidArgumentException","httpStatus":null,"severity":"error","filePath":"framework/core/src/Http/RouteCollection.php","lineNumber":112,"sourceCode":"    }\n\n    public function getRouteData(): array\n    {\n        if (! empty($this->pendingRoutes)) {\n            $this->applyRoutes();\n        }\n\n        return $this->dataGenerator->getData();\n    }\n\n    protected function fixPathPart(mixed $part, array $parameters, string $routeName): string\n    {\n        if (! is_array($part)) {\n            return $part;\n        }\n\n        if (! array_key_exists($part[0], $parameters)) {\n            throw new \\InvalidArgumentException(\"Could not generate URL for route '$routeName': no value provided for required part '$part[0]'.\");\n        }\n\n        return $parameters[$part[0]];\n    }\n\n    public function getPath(string $name, array $parameters = []): string\n    {\n        if (! empty($this->pendingRoutes)) {\n            $this->applyRoutes();\n        }\n\n        if (isset($this->reverse[$name])) {\n            $maxMatches = 0;\n            $matchingParts = $this->reverse[$name][0];\n\n            // For a given route name, we want to choose the option that best matches the given parameters.\n            // Each routing option is an array of parts. Each part is either a constant string\n            // (which we don't care about here), or an array where the first element is the parameter name","sourceCodeStart":94,"sourceCodeEnd":130,"githubUrl":"https://github.com/flarum/framework/blob/4b939f685389bfe8a380e9e28ddf305a1c66950c/framework/core/src/Http/RouteCollection.php#L94-L130","documentation":"When generating a URL with RouteCollection::getPath(), route paths contain required parameter parts parsed by FastRoute (e.g. '/u/{username}'). fixPathPart() throws this InvalidArgumentException when the $parameters array passed to getPath() has no key for a required parameter, so a complete URL cannot be built.","triggerScenarios":"Calling getPath('routeName', $params) where the route path template has a required placeholder (e.g. {id}) but $params omits that key — e.g. getPath('user', []) for the route '/user/{username}'.","commonSituations":"A refactored route gained a required parameter while call sites still pass the old parameter set; a variable holding the parameter is null or unset before getPath() is called; iterating over entities where some lack the identifier field.","solutions":["Pass a value for every required parameter: getPath('user', ['username' => $name]).","Check the route definition for its placeholder names and align your parameters array keys.","Make the parameter optional in the route path ('{username?}') if it truly can be absent.","Guard the call: only build the URL when all required values are present.","null the link / return null instead of generating it when data is incomplete."],"exampleFix":"// before\n$url = $routes->getPath('user', []); // route: /user/{username}\n// after\n$url = $routes->getPath('user', ['username' => $user->username]);","handlingStrategy":"validation","validationCode":"$required = ['username']; // placeholders of the route path\n$missing = array_diff($required, array_keys($parameters));\nif ($missing) { throw new \\InvalidArgumentException('Missing route params: '.implode(',', $missing)); }\n$url = $routes->getPath('user', $parameters);","typeGuard":"function hasRouteParams(array $parameters, array $required): bool {\n    return count(array_intersect_key(array_flip($required), $parameters)) === count($required);\n}","tryCatchPattern":"try {\n    $url = $routes->getPath('user', $parameters);\n} catch (\\InvalidArgumentException $e) {\n    if (str_starts_with($e->getMessage(), 'Could not generate URL for route')) {\n        $url = null; // degrade gracefully\n    } else {\n        throw $e;\n    }\n}","preventionTips":["Match parameter keys to the route path placeholders exactly.","When a route gains a parameter, grep all getPath() call sites.","Only call getPath() after confirming the entity has the needed identifier."],"tags":["php","routing","missing-parameter","url-generation","flarum"],"backgroundTag":"missing-required-argument","analyzedSha":"4b939f685389bfe8a380e9e28ddf305a1c66950c","analyzedAt":"2026-09-15T18:09:20.879Z","contentChangedAt":"2026-09-15T18:09:20.879Z","schemaVersion":2},"datasetVersion":"2026-09-16T09:17:16.951Z"}