Rails - How to call values from one model into another model form

Question

I'm working on some app and I have 2 models. Categories in which I create category names and Question. Category has_many questions and Question belongs_to Category.
I've added category_id to Question model.

Now I need to take all Category_names and display them in form where I create Question so User can choose in which category_name will save question.

I've tried something like this in firs line of code but not working.

<%= f.input :category_id, Category.all.map(&:name) %>
<%= f.input :question_name, wrapper: :vertical_text_input, as: :text %>
<%= link_to "Markdown help", "http://assemble.io/docs/Cheatsheet-Markdown.html", target: "_blank", class: "right" %>
<%= f.input :answer %>
<%= f.input :image, as: :attachinary %>

QUESTION: How to display all Category names in form where I create new Questions?

score 2 · Accepted Answer · answered Apr 23 '16 at 15:38

2

you may wanna use a select box and use the collection select rails helper :

f.collection_select(:category_id, Category.all, :id, :name)

answered Apr 23 '16 at 15:38

nicolas

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6
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It works but when I open page where this form is, it's not showing me collection_select until I refresh page. Then loads select field. Don't know why is this happening.. – RubyDigger19 Apr 24 '16 at 10:31

7urkm3n · Answer 2 · 2016-04-23T17:09:33.377

1

Also you can use this way.

<%= f.select :category_id, Category.all.map(&:name), {prompt:"Choose Category"}%>

@Jhon suggestion.

<%= f.select :category_id, Category.pluck(:name), {prompt:"Choose Category"}%>

edited Apr 23 '16 at 17:09

answered Apr 23 '16 at 16:58

7urkm3n

6,054
4
29
46

1

`Category.pluck(:name)` is faster than the above – mr_sudaca Apr 23 '16 at 17:04

Rails - How to call values from one model into another model form

2 Answers2