Saving enum from select in Rails 4.1

Question

I am using the enums in Rails 4.1 to keep track of colors of wine.

Wine.rb

class Wine < ActiveRecord::Base
    enum color: [:red,         


        

Answer 1

Alright, so apparently, you shouldn't send the integer value of the enum to be saved. You should send the text value of the enum.

I changed the input to be the following:

f.input :color, :as => :select, :collection => Wine.colors.keys.to_a

Which generated the following HTML:

<select id="wine_color" name="wine[color]">
  <option value=""></option>
  <option value="red">red</option>
  <option value="white">white</option>
  <option value="sparkling">sparkling</option>
</select>

Values went from "0" to "red" and now we're all set.

---

If you're using a regular ol' rails text_field it's:

f.select :color, Wine.colors.keys.to_a

---

If you want to have clean human-readable attributes you can also do:

f.select :color, Wine.colors.keys.map { |w| [w.humanize, w] }

Answer 2

If you use enum in Rails 4 then just call Model.enums:

f.select :color, Wine.colors.keys

To create HTML:

<select name="f[color]" id="f_color">
    <option value="red">red</option>
    <option value="white">white</option>
    <option value="sparkling"> sparkling </option>
</select>

Or add method in controller:

def update_or_create
    change_enum_to_i
    ....
end

def change_enum_to_i
    params[:f]["color"] = params[:f]["color"].to_i
end

Answer 3

Here is what worked for me, Rails 4+:

class Contract < ApplicationRecord

enum status: { active:  "active", 
               ended: "active", 
               on_hold: "on_hold", 
               terminated:  "terminated", 
               under_review:  "under_review" , 
               unknown: "unknown" 
              }


end

in my _form.html.erb , I have this:

  <div class="field">
    <%= form.select :status, Contract.statuses.keys, {}%>
  </div>

test from Console after adding a record:

2.3.0 :001 > Contract.last.status
  Contract Load (0.2ms)  SELECT  "contracts".* FROM "contracts" ORDER BY "contracts"."id" DESC LIMIT ?  [["LIMIT", 1]]
 => "active"

Answer 4

Here's my solution (my roles have underscores in them like "sales_rep"), and for some reason this was how I needed to get a blank option to work (with simpleform?):

In ApplicationHelper:

def enum_collection_for_select(attribute, include_blank = true)
  x = attribute.map { |r| [r[0].titleize, r[0]] }
  x.insert(0,['', '']) if include_blank == true
  x
end

Then in my form:

<%= f.input :role, collection: enum_collection_for_select(User.roles), selected: @user.role %>

Answer 5

No need converting the enum hash to array with to_a. This suffice:

f.select :color, Wine.colors.map { |key, value| [key.humanize, key] }

Answer 6

If you need to handle the i18n based on the enum keys you can use:

<%= f.select :color, Wine.colors.keys.map {|key| [t("wine.#{key}"), key]} %>

and in the tranlations you can set the colors:

wine:
 red: Red
 white: White