Rails 3: migration error when using json as a column type in an ActiveRecord backed by Postgres

Question

I am running Rails 3.2.17 and Postgres 9.3.4. I created a new ActiveRecord model using \"rails generate\" and one of the column types is json. My intention is to use the jso

Answer 1

Change your migration like

class CreateThing < ActiveRecord::Migration
  def change
    create_table :things do |t|
      t.integer :user_id
      t.column :json_data, :json   # Edited
      t.timestamps
    end
    add_index :things, :user_id
  end
end

And by default rake db tasks will look into schema.rb( which wont be the case for postgres) so in application.rb change it to

config.active_record.schema_format = :sql

Answer 2

Set the following in application.rb

config.active_record.schema_format = :sql

Then structure.sql will be used instead of schema.rb to create the database from scratch. More info - https://github.com/diogob/activerecord-postgres-hstore

Answer 3

We have a legacy application that uses activerecord-postgres-json to add json and jsonb type support to ActiveRecord in Rails 3.2; it may be an option if you're stuck at a low Rails version.