CODEWITHSUNDEEP
ruby-on-railsselect
Haseeb Ahmad
Haseeb Ahmad

Reputation: 8730

Show slected values in multi selected rails

In multi selected :selected=>@campaign.categories.pluck(:name) not working and even not giving any error

<%= f.select(:category, options_for_select(Category.all.map{|u| [u.name, u.id]}, :selected => @campaign.categories.pluck(:name) ), {}, {:multiple => true,:required => true, :class => 'form-control' }) %>

Upvotes: 0

Views: 54

Answers (2)

Andrey Deineko
Andrey Deineko

Reputation: 52357

There are few issues with your code.

Category.all.map{|u| [u.name, u.id]}

is extremely inefficient way of achieving what you need, since loads the whole Category table into memory prior processing. Here, really, you would need to use pluck:

Category.pluck(:name, :id)

Next thing, is that you can not have a collection as a selected value.

You have to actually select a value.

<%= f.select(
  :category,
  options_for_select(
    Category.pluck(:name, :id),
    selected: @campaign.categories.pluck(:name).first # concrete value here, not a collection
  ),
  {},
  multiple: true,
  {:multiple => true,:required => true, :class => 'form-control'}
) %>

Upvotes: 2

Rajarshi Das
Rajarshi Das

Reputation: 12320

You can try below

<%= f.select(:category, options_for_select(Category.all.map{|u| [u.name, u.id]}, @campaign.categories.map{|j| [j.id]} ),:multiple => true, :required => true, :class => 'form-control' ) %>

or

<%= f.select(:category, options_for_select(Category.pluck(:name, :id), @campaign.categories.pluck(:id) ), :multiple => true, :required => true, :class => 'form-control' )

Upvotes: 1

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