Unique child count question about rabl HOT 7 CLOSED

I am not sure I fully understand. It sounds like you want a way only to return the unique required items associated with a mission. I would probably not calculate that in the view. I would create the logic in the model:

# mission.rb
class Mission

  # Returns the required items for this mission
  def unique_required_items
    self.requirement_items.uniq_by { |item| i.title }
  end
end

# View
child :unique_required_items => :requirements do
  attributes :id, :title
  # Whatever else you want to add to the response
end

If I missed the question maybe you can elaborate

from rabl.

Thanks for your answer. This is not problem to render unique items, I have a problem with counting them.

I'll try to describe this other way.
There are 1 mission and 2 items in database. And then I did this:

20.times { Mission.first.items << Item.first }
10.times { Mission.first.items << Item.last  }

And I need to get in my view something like this:

missions: [
  mission: {
    title: "something"
    requirements: [
      item: {
        title: "item 1"
        num: 20
      }, 
      {
        item: {
          title: "item 2"
          num: 10
        }, 

      }
    ]
  }
]

So, Mission.first.items.count should return 30, but when I render this, I want there would be only 2 items (unique), but with additional attribute num (or quantity).

I hope this is better explanation. Thank you one more time.

from rabl.

How about something like this:

# mission.rb
class Mission
  def unique_required_items
     items = self.requirement_items.group_by(&:id)
     # Returns { 1 => [<item>, <item>], 2 => [<item2>, <item2>], ... }
     items.map do |item_id, items|
       { :item => { :title => items[0].title, :num => items.size } }
     end
     # Should return [ { :item => { :title => "...", :num => 20 } }, ... ]
  end 
end

# View
code :requirements do |m|
  m.unique_required_items
end

Not the best solution ever but in principle it should work. Pushes a lot of the work into the model.

from rabl.

Another option (same idea):

# View
code :requirements do |m|
  m.requirement_items.group_by(&:id).map do |item_id, items|
    { :item => { :title => items[0].title, :num => items.size } }
  end
  # Should return [ { :item => { :title => "...", :num => 20 } }, ... ]
end

from rabl.

Thanks a lot, I'll try it tonight!

from rabl.

Re-open if you cant get it working.

from rabl.

Works awesome, thanks!

from rabl.