Postgresql JSON column as HashWithIndifferentAccess

Question

I have a table called 'my_models' with a 'json' column called 'settings'.

I also have the following model:

class MyModels < ActiveRecord::Base
end

The 'settings' attribute of an 'MyModels' instance is a Hash.

Is it possible to configure 'MyModels' to type cast the raw column value of 'settings' to a HashWithIndifferentAccess instead of Hash?

Community · Accepted Answer · 2017-05-23 12:09:41Z

7

Serialize alone wont work here since HashWithIndifferentAccess does not respond to both load and dump methods, but you can do this:

class THEModel < ActiveRecord::Base
  def my_hash_attribute
    read_attribute(:my_hash_attribute).with_indifferent_access
  end
end

See also Custom serialization for fields in Rails

edited May 23, 2017 at 12:09

CommunityBot

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answered Jun 24, 2014 at 14:39

ichigolas

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4 Comments

Jacob Over a year ago

Ahh a custom serializer. I always thought their were limited to text columns, but it works great!

joncalhoun Over a year ago

While this works, it should probably be noted that it prevents you from editing the hash directly. For example: model.my_hash_attribute = {} model.my_hash_attribute[:test] = "abc" model.my_hash_attribute # {} Doesn't work like most people would expect it to.

Michael Johnston Over a year ago

with a cursory look at HashWithIndifferentAccess, I can't figure out why calling .with_indifferent_access on a jsonb attribute breaks writing to it.

DuBistKomisch Over a year ago

See stackoverflow.com/a/28683140/3453300 for an answer which allows modifying the hash.

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