# Errore: Admin is not missing constant Publisher!

**URL:** <https://www.ruby-forum.com/t/errore-admin-is-not-missing-constant-publisher/172428>\
**Category:** IT\
**Created:** [July 21, 2009, 1:44pm UTC](https://www.ruby-forum.com/t/errore-admin-is-not-missing-constant-publisher/172428 "2009-07-21T13:44:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![arcoder](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/278dde/32.png) [@arcoder](https://www.ruby-forum.com/u/arcoder)\
**Post date:** [July 21, 2009, 1:44pm UTC](https://www.ruby-forum.com/t/errore-admin-is-not-missing-constant-publisher/172428/1 "2009-07-21T13:44:02Z")

</div>

Ciao a tutti,  
ho una relazione has\_and\_belongs\_to\_many tra due tabelle.  
Non capisco perchè quando nel tag HTML select metto

\<%= collection\_select(:document, :publisher\_ids, Publisher.find(:all),  
:id, :nickname, {:prompt =\> “-Select who can read”}, :multiple =\> true,  
:class =\>“sel”) %\>

l’insert nella tabella documents\_publishers funziona alla grande, mentre  
se scrivo

\<%= collection\_select(:document, :publisher\_ids,  
Admin::Publisher.find(:all), :id, :nickname, {:prompt =\> “-Select who  
can read”}, :multiple =\> true, :class =\>“sel”) %\>

Admin::Publisher.find(:all) mi solleva l’errore “Admin is not missing  
constant Publisher!”

Grazie mille per l’attenzione.

Saluti

Alberto