I have working on project using ruby on rails. I have created a form with many fields and one field is for jobs where I want to choose more then one job but now I am not able to choose more then one job with following code. Working with ruby on rails 3 and HAML. I also mention multiple true but still its not working.
= f.select :jobs, options_from_collection_for_select(Demojob.all, 'name','name' ), :multiple => true
If you check the implementation of the form builder select method (github), you'll see that the method signature is:
select(method, choices = nil, options = {}, html_options = {}, &block)
multiple flag should be passed using html_options hash, not options. In your case, it should be:
f.select :jobs, options_from_collection_for_select(Demojob.all, 'name', 'name'), {}, :multiple => true
Or, even better, if you prefer new hash syntax:
f.select :jobs, options_from_collection_for_select(Demojob.all, 'name', 'name'), {}, multiple: true
Lastly, there's no need to use options_from_collection_for_select with form builder, you can simply pass the options as arrays:
f.select :jobs, Demojob.all.collect { |job| [job.name, job.name] }, {}, multiple: true
Cheers!