将下拉菜单按字母顺序放在红宝石上

Question

I'm using ruby on rails to create a database. I added a drop-down menu for the form of one of my tables. The drop-down menu is a foreign key from another table. I'm trying to figure out how to put that drop-down menu in alphabetical order.

Here is my code for form.html.

<div class="field">
  <%= f.label :founder_id %><br />
  <%= f.select(:founder_id, @founders.map{|founder| [founder.founder_name, founder.id]}) %>
</div>

Is there anything I can change to get this to show up in my form in alphabetical order? Any tips would be great. Thanks!

Answer 1

Yes, just add some sorting:

@founders.sort_by(&:founder_name).map{|founder| [founder.founder_name, founder.id]}

or

@founders.map{|founder| [founder.founder_name, founder.id]}.sort_by(&:first)

f.select will display the options in the same order that it gets them. Case insensitive sorting is left as an exercise.

Answer 2

@founders.map{|founder| [founder.founder_name, founder.id]}.sort{|a,b| a.founder_name.downcase <=> b.founder_name.downcase}

这将解决您的问题。