is Lambda supported?

[kingsleyh]

hi

is this kind of query possible currently?

r.table('orders').concat_map(lambda order:
    order['items'].map(lambda item:
        {'item_id': item['item_id'], 'quantity': item['quantity'], 'count': 1}
    ))

I searched the repo and found only references to lambda in yaml files so I guess it's not implemented.

[lbguilherme]

It is, but using crystal blocks:

r.table("orders").concat_map do |order|
  order["items"].map do |item|
    {"item_id" => item["item_id"], "quantity" => item["quantity"], "count" => 1}
  end
end

Same syntax as in Ruby

[kingsleyh]

aah awesome thanks - I couldn't see it

[kingsleyh]

concat_map doesn't seem to exist though - is there an equivalent?

[lbguilherme]

f9a52b76 :wink:

[kingsleyh]

awesome thanks :) - I'm still getting my head around how the library works!

[kingsleyh]

I notice that

 r.table("users").concat_map do |user| user end 

complains

  'RethinkDB::TableTerm#concat_map' is expected to be invoked with a block, but no block was given

but it works in this format ok:

 r.table("users").concat_map{|user| user } 

The nested ones seem to work fine with do end though