CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-3.2rails-activerecord
Henry
Henry

Reputation: 926

render ActiveRecord response in from Controller to View

I'm new to Rails. I'm using Rails 3.2.13. I'll try to keep my question succinct:

In my controller, I want to get the last 10 entries from the Observation table. I have:

def index
   @times = Observation.select(:load_time).last(10)
end

In that view, I attempt to render the 10 entries in @times like this:

<% @times.each do |time| %>
<p>time: <%= time %></p>
<% end %>

A response I get in my web page looks like this:

time: #<Observation:0x007fe22bf2a138>

I'm wondering how to get the actual time variable as a float rather than (what looks like) a memory address. It appears that the last 10 entries are correctly making it to the controller which is good.

There is no logic in my Observation < ActiveRecord::Base class because the migration is responsible for defining the schema. Here's what my db/migrate/create_observations.rb looks like:

class CreateObservations < ActiveRecord::Migration
  def change
    create_table :observations do |t|
        t.float :load_time
        t.timestamps        
    end

Thanks in advance for any help - it's much appreciated.

Upvotes: 2

Views: 369

Answers (2)

sites
sites

Reputation: 21785

You just have to access the variable inside the object

<%= time.your_field %>

in your case:

<%= time.load_time %>

Upvotes: 2

DMKE
DMKE

Reputation: 4603

In your view, <%= time => translates to _buf << time.to_s (where _buf is ERb's internal output buffer). An easy workaround to this is to define Observation#to_s, like so:

class Observation < ActiveRecord::Base
  def to_s
    load_time.to_s
  end
end

Be aware that a Observation.select(:id).map(&:to_s) now would cause an ActiveModel::MissingAttributeError error (since to_s requires this column to be present).

In general, I'd adwise to explicitly fetch the result you need, i.e. in your case:

<% @times.each do |time| %>
  <p>time: <%= time.load_time %></p>
<% end %>

Upvotes: 1

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