How to put variables into HTML from ruby on rails

Question

I tried to use a variable in HTML which is calculated from ruby code and MSSQL

This is my Ruby code to get @result

class StartingController < ApplicationController

before_action :require_user, only: [:index, :start]

attr_reader :table
attr_writer :table

def initialize
@table = Hash.new()
@connection = ActiveRecord::Base.connection
@st='exec search '
end

def start
.... some code set @st values  
  @result = @connection.exec_query(@st)
  @table = @result[0]
  redirect_to '/results'
end
end

def index
end

def results
end

end

This is the HTML which need to use @result

<% @result.each do |x| %>
 <tr>
 s: <td><%= x %></td>

</tr>
<% end %>

But I always get

undefined method `each' for nil:NilClass

if I

puts @result

I can get correct value

Can anyone help?

I'm not sure what's going on here. Controllers aren't supposed to have an initialize method, and there's no need to use ActiveRecord::Base directly if you have a model. What reference are you basing this on? A good reference book on Rails should show you how to construct this properly. — tadman
– tadman, Commented Apr 26, 2016 at 3:12
I agree with @tadman, it is not a good idea for your controller to have an initialize method. Also, it looks like you are being redirected to "/results", I would either have your @results variable being defined in the results action, OR change your redirect_to '/results' to render :results. — sclem72
– sclem72, Commented Apr 26, 2016 at 16:38

Hoang Phan · Accepted Answer · 2016-04-26 03:12:58Z

1

Problem is the instance variables(and variables) only accessible within an action, and your redirect_to actually change the action from start to results, so @results is not initialized.

I assume that you have a view at views/start/result.html.erb.

The best solution for this is you can remove the action results, and call render :results instead of redirect_to.

answered Apr 26, 2016 at 3:12

Hoang Phan

2,1661 gold badge17 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to put variables into HTML from ruby on rails

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related