NoMethodError: undefined method `to_msgpack' for #<Subreddit:0x007ff0a3b9b950>

[Esteban Feldman]

Hi all,

I'm getting this message when I try to create a new Ohm model

Having this 2 models:

class Subreddit < Ohm::Model
  attribute :name

  index :name

  def self.seed(names)
    names.each do |name|
      create(name: name) if find(name: name).empty?
    end
  end

  def create_entry(attrs)
    attrs[:subreddit_id] = id
    entry = Entry.create(**attrs)
    entry
  end
end

class Entry < Ohm::Model
  attribute :rid
  attribute :title
  attribute :url
  reference :subreddit, :Subreddit
  attribute :permalink

  index :rid
  index :url
  index :subreddit

  unique :rid
end




I get this error when I try to use the new_entry on Subreddit on when trying to create an Entry by hand

[1] pry(main)> Subreddit[1]
=> #<Subreddit:0x007fdd0b4f1858 @_memo={}, @attributes={:name=>"pics"}, @id=1>
[2] pry(main)> Entry.create(rid: 1, subreddit_id: 1)
NoMethodError: undefined method `to_msgpack' for #<Subreddit:0x007fdd0b539090>
from /Users/eka/dev/web/sites/rdp-sinatra/vendor/bundle/gems/ohm-2.0.1/lib/ohm.rb:1393:in `to_msgpack'

Any clue on what I'm doing wrong?

[Michel Martens]

Do you have the msgpack gem installed?

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[Michel Martens]

We discussed this on IRC and it's solved, but for posterity: the error
was in `index :subreddit`, which is not necessary as `reference`
already creates on index on `subreddit_id`.