rails erb form helper options_for_select :selected

问题:

I have an edit form in erb.

Within the code I have a select with options:

 :gender) %> 

However, the select is not showing the correct selected value. What could I be doing wrong? I can get it to work if I hardcode it but of course that is not a viable option.

回答1:

In your code, your options_for_select() call sets the selected value to "gender" and does not attempt to use the value from your form object.

Please see the docs for options_for_select() for usage examples.

options_for_select(['Mare', 'Stallion', 'Gelding'], f.object.gender) options_for_select(['Mare', 'Stallion', 'Gelding'], :selected => f.object.gender) 

Alternatively, you can do this, which will already use the gender() value for your form object:

回答2:

By the way, if you are using :include_blank => true, this will set your current selection to blank even though the form "knows" what is selected.

文章来源: rails erb form helper options_for_select :selected