Question

I’ve got a model, Entity.

class Entity
  include Mongoid::Document

  field :x
  field :y
  field :z, type => Hash, :default => {} # new field

end

I added a new field to it, a hash. When I try to use it, I get an error. My code is:

e = Entity.first
if e.z["a"] # if there is a key of this in it?
  e.z["a"] = e.z["a"] + 1
else
  e.z["a"] = 1
end

But, this error with an undefined method get for hash. If I try to create an initializer for it, to set the values in an existing document, it errors with the same error. What am I doing wrong?

Initializer looks like:

e = Entity.first
e.write_attribute(:z, {})

Thanks

Answer 1

Sorted it.

It seems the answer is to set in Mongoid 1.9.5 the hash to:

field :hash_field, :type => Hash, :default => Hash.new

and it can access and initialize it. Not quite understanding why, but happy to have the answer !