500 Internal Server Error

maybe "rows: 1", it isn't an option for text_field (but for textarea)

Yes, it is only a text area option, and also the second parameter that a text_field accepts it’s the prompt value (default value) of the field, and that second parameter needs to be a string.

Thank you for the reply :slight_smile:

The problem occurred after a “bundle update” and we did not check what got updated…

The problem comes from https://github.com/bcardarella/client_side_validations, a plugin that we used.

Here is the problem : with the “:validate => true”, “f” seemed to expect fields post-“bundle update” that it did not check pre-“bundle update”.

So i removed “:validate => true” from the following code

<%= form_for([@grade,@tree,@knowledge_cell], :validate => true ) do |f| %>

<% end %>

And it worked…

this solution is more about suppressing the problem that to solve it properly… Should check the repo !