Question

I have a ruby (1.9.3) on rails (3.1) app where:

app/models/list.rb

class List < ActiveRecord::Base
  has_many :tasks
  #...
end

app/models/task.rb

class Task < ActiveRecord::Base
  belongs_to :list
  #...
end

I am trying to loop through a List’s tasks to search if there are ANY tasks that have

task.planned_for.blank? or task.mins.blank?

Essentially if the loop finds either, I need to conditionally display some view code. Thoughts?

Answer 1

the SQL equivalent of ActiveSupport#blank? is:

column_name IS NULL OR column_name = ''

so in your controller show method:

@list = List.find(params[:id])
@tasks = @list.tasks.where("planned_for IS NULL OR planned_for = '' OR mins IS NULL OR mins = ''")

in your view:

<% if @tasks.any? %>
  <% #do some stuff %>
<% else %>
<% end %>