Rails 4 - Single Attribute to Accept Array of Values

Question

I am needing to have an attribute in my form (:supported_media_types) accept an array of values.

For example, I want the user to be able to click on both JPG and PNG if required.

I have setup a select2 drop down with multiple: true

Is there an easy way to achieve this or am I required to create a join table?

<%= f.select :supported_ad_types, supported_types_of_media, {include_blank: true}, {class: 'filter_select', name: 's2id_location_supported_ad_types[]', style:'width:100%;', placeholder: 'Supported File Types', required: true, multiple: true} %>

jan · Accepted Answer · 2014-08-11 22:59:23Z

2

use select_tag 'supported_ad_types[]' ... to get array params.

In your model use serializer :supported_ad_types, array to save array params.

answered Aug 11, 2014 at 22:59

jan

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Comments

Tiago Farias · Accepted Answer · 2014-08-11 23:07:24Z

0

Create a serialized attribute like this:

1 - Add a column to your migration normally, as text:

rails g model Image types:text
rake db:migrate

2 - In your class:

class Image < ActiveRecord::Base
    serialize :types, Array
end

Now, you can do things like:

i = Image.new
i.types << "png"
i.types << "jpg"
i.save
=> #<Image id: 1, types: ["png", "jpg"], created_at: "2014-08-11 22:44:08", updated_at: "2014-08-11 22:44:08">

edited Aug 11, 2014 at 23:07

answered Aug 11, 2014 at 22:47

Tiago Farias

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8 Comments

RubyNewbie Over a year ago

Thanks! Seems to be passing in a blank value on first record. I changed my (include_blank: false)

RubyNewbie Over a year ago

"supported_ad_types"=>["", "JPG", "BMP"],

Tiago Farias Over a year ago

That's something to do with the select.

Tiago Farias Over a year ago

As for the blank value being persisted, take a look at this (there is also a workaround): stackoverflow.com/questions/8929230/… . And consider accepting the answer if it helped.

RubyNewbie Over a year ago

Accepted answer along with Jan.

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