I would like to try and fix this (just for fun).

From the log, I have noticed a strange behavior.
If the name contains only numerical characters, ActiveRecord runs a query that looks for an id that matches.
Otherwise, it goes over the records' name attribute and compares.

I will try to figure out a nice way to fix this.

BR.

The log:
Started GET "/puppetclasses/123bla/edit" for 172.17.42.1 at 2014-08-25 19:37:46 +0000
Processing by PuppetclassesController#edit as HTML
Parameters: {"id"=>"123bla"}
Puppetclass Load (0.3ms) SELECT "puppetclasses".* FROM "puppetclasses" WHERE "puppetclasses"."name" = '123bla' ORDER BY puppetclasses.name LIMIT 1

Started GET "/puppetclasses/123/edit" for 172.17.42.1 at 2014-08-25 19:37:53 +0000
Processing by PuppetclassesController#edit as HTML
Parameters: {"id"=>"123"}
Puppetclass Load (0.1ms) SELECT "puppetclasses".* FROM "puppetclasses" WHERE "puppetclasses"."id" = ? ORDER BY puppetclasses.name LIMIT 1 "id", "123"
not found: Couldn't find Puppetclass with id=123

OK, I guess this is the reason for that behavior.

```
@puppetclass = (params[:id] =~ /\A\d+\Z/) ? pc.find(params[:id]) : pc.find_by_name(params[:id])
```

If the `params[:id]` is a number then we use `find`. Otherwise, we use `find_by_name`.
We probably should change this logic, to fix this bug.

BR.