[Flow] No unique path segment could be found after 100 iterations

[Bastian Waidelich]

Adriano Fialho wrote:

Hi Adriano,

> I have the follow error?
> *"No unique path segment could be found after 100 iterations".*
>
> I identify that the framework class
> "TYPO3\Flow\Mvc\Routing\IdentityRoutePart" has a "resolveValue" method that
> try to resolve an entity with max 100 iterations.[...]

The Identity-RoutePart handler basically converts an entity to a unique 
string that can be used in the URL, vice versa.
By default it therefore uses the unique identifier of an entity (usually 
the UUID) thus the mapping is unambiguous.

By specifying the "uriPattern" option of the Identity-RoutePart you can 
however use any property on the entity. For example if you have a user 
"John Doe" it might create the last part of 
"http://yourdomain.tld/users/john-doe".
But in this case the "uniqueness" is not guaranteed and if there's 
another user with the same name it must not re-create the same string 
but "john-doe-1". If you have 100 users with the same name, you'll run 
into trouble and should rethink the "uriPattern" option (and change it 
from "{firstName}-{lastName}" to something more unique like "{username}" 
for instance).

Best,
-- 
Bastian Waidelich