I did find this question on SO, but it didn't help, really.
So, I'd like to pass an array through a hidden field tag. As of now my code is:
<%= hidden_field_tag "article_ids", @articles.map(&:id) %>
This obviously does not work since it passes the ids as a string.
How do i do it?
Hi maybe there is better solution but you may try
<% @articles.map(&:id).each do |id| %>
<%= hidden_field_tag "article_ids[]", id %>
<% end %>
The following worked for me on Rails 4.1.10
<% @your_array.map().each do |array_element| %>
<%= hidden_field_tag "your_array[]", array_element %>
<% end %>
You could try to parse it to and from json:
articles_list = @articles.map(&:id).to_json # gives u: [1,2,3,4,5]
# note that the result is a string instead of an array
article_ids = JSON.parse(articles_list)
Or you could just make use of comma separated string:
articles_list = @articles.map(&:id).join(",") # gives u: 1,2,3,4,5
# note that this result is a string also
article_ids = articles_list.split(/,/).map(&:to_i)
On Rails 4 you can do:
<% @articles.map(&:id).each do |id| %>
<%= hidden_field_tag "article_ids", value: id, multiple: true %>
<% end %>
As Rails will automatically append "[]" to the name of the field (when using multiple) and the controller that receives the form will see that as an array of values.
"article_ids"=>"{:value=>123, :multiple=>true}"
<%= hidden_field "article_ids", id, multiple: true %> and see if it works then I'll update the answer? (using hidden_field helper and without value:)tag method and I did not find anything about multiple. Maybe this is deprecated?
hidden_field_tag with an empty Array or nil value, otherwise, there will be no way for the User to "uncheck" all the values.