Question

I have 2 models user and team. a team can have many users each users belong to a team.

team_id is a column in my user table as a fk.

I want to have a select drop down on my create user form that has all my teams team_id in it.

This code does what I want BUT

 <%= f.fields_for :teams do |builder| %>
    <p>
        <%= f.label :team_id, "Select Team For User" %>
        <%= builder.collection_select :team_initials, Team.all, :id, :team_initials %>
    </p>
<% end %>

it does not try to add the id value to a user. here is the error

    Parameters:
{"utf8"=>"✓",
 "authenticity_token"=>"xxxxx",
 "user"=>{"name"=>"brand new",
 "email"=>"[e-mail]",
 "password"=>"[FILTERED]",
 "password_confirmation"=>"[FILTERED]",
 "teams"=>{"team_initials"=>"27"}},
 "commit"=>"Create my account"}

It complains that it cant add to the team model.

All I want to do is grab the ID of all existing teams for my create user form so when you crate a user you can select that users team.

The reason I have team_initials above is I was trying to use a more user friendly field for select but still user team Id as the value.

Answer 1

I think you’re on the right track. The fields_for mechanism is for setting values in the associated model. I think all you’re trying to do is make the association.

So you can lose the fields_for line and then this section:

builder.collection_select :team_initials, Team.all, :id, :team_initials

Should be:

f.collection_select :team_id, Team.all, :id, :team_initials

I’m looking here for my info on collection_select since I don’t know it off the top of my head:
http://api.rubyonrails.org/classes/ActionView/Helpers/FormOptionsHelper.html

I think this will change this parameter from "teams"=>{"team_initials"=>"27"}}, to "team_id"=>"27",

I hope that fixes it.