如何将select标签与Rails中控制器中的数组一起使用？

Question

I have made an array in my controller of a certain model. I stored that array in the variable @students. I am having trouble getting it to fill out a select dropdown.

My current code is:

= select :student_name, :id, @students

I want to be able to list the students by their name, which could be called at student.name and I want to be the value of each to be set as student.

Any help would be great, as I am a beginner with rails. By the way, I am using Rails 4

Answer 1

You can use options_from_collection_for_select

Try to get all the students name and id in active-record no need to assign in array.

<% options = options_from_collection_for_select(@students, 'id', 'name') %>
<%= f.select :all_val,  options %>

And if you really wants to do in array then do that following way.

 @students = [["john", 1], ["mandos", 2], ["kendy", 3]]
    <% options = options_from_collection_for_select(@students, 'id', 'name') %>
    <%= f.select :all_val,  options %>

Answer 2

AS @Bharat soni Suggested,using option-from_collection_for_select would be great! Although if you don't want it,you can simply list those options in select tag itself like this

= select :student_name,@students,'id','name' #Would give the list of student names in the dropdown