问题
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?
回答1:
Hi maybe there is better solution but you may try
<% @articles.map(&:id).each do |id| %>
<%= hidden_field_tag "article_ids[]", id %>
<% end %>
回答2:
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 %>
回答3:
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)
回答4:
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.
来源:https://stackoverflow.com/questions/4508941/passing-an-array-through-a-hidden-field-tag-in-rails