Removing empty hashes in Rabl

Question

In rabl I'm trying to have a child whose elements are conditional, but in the cases where to condition evaluates false it's still rendering elements which have no attributes.

Here's my .rabl:

child(:products) do
  attribute :id, :if => lambda{ |p| p.store_id == @store.id }
end

Hoping for .json that looks something like this:

"products":[{"id":2}]

But it's rendering empty values as well:

"products":[{}, {"id":2}, {}]

Is there a way I can make it so that empty elements are ignored entirely?

score 3 · Accepted Answer · answered Aug 13 '13 at 15:55

3

Assuming you are expecting a products method on an instance variable:

child(@catalogue.products.select{|p| p.store_id == @store.id} => :products ) do
  attribute :id
end

answered Aug 13 '13 at 15:55

Harish Shetty

64,083
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score 0 · Answer 2 · answered Aug 13 '13 at 15:28

0

Hmmmm. U can do this way.

[{},{a: "b"},{}].reject {|h| h.blank?}

answered Aug 13 '13 at 15:28

Abibullah Rahamathulah

2,785
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27

I can't actually manipulate `"products":[{}, {"id":2}, {}]` that's just the JSON that rabl is rendering. – Michael Gruber Aug 13 '13 at 15:38
Hmmm. I haven't tried rabl. However U can try doing this. It's a quess. Just try putting `end.reject {|h| h.blank?}` after the "do end".Mostly It should do the Trick. – Abibullah Rahamathulah Aug 13 '13 at 15:47

Removing empty hashes in Rabl

2 Answers2