Unable to query hstore attribute in Rails [duplicate] - ruby-on-rails

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NoMethodError when I try to acces a field of an object taken from the DB
(4 answers)
Closed 7 years ago.
I've added a hstore attribute to my model:
class ChangePerDayAverageInterestToHstore < ActiveRecord::Migration
def change
add_column :companies, :per_day_average_interest, :hstore
end
end
Now when I generate the item via the console, I am able to query it without issue. Like so:
irb(main):002:0> t = Company.new per_day_average_interest: {1 => 10, 2 => 3}
irb(main):011:0> t.per_day_average_interest
=> {"1"=>"10", "2"=>"3"}
irb(main):013:0> t.per_day_average_interest["1"] => "10"
irb(main):014:0> t.per_day_average_interest["2"]
=> "3"
When I save it, then query it, I get a No Method error:
irb(main):028:0> t.save!
(0.2ms) BEGIN SQL (0.3ms) INSERT INTO "companies" ("created_at", "per_day_average_interest", "updated_at") VALUES ($1, $2, $3) RETURNING "id" [["created_at", "2015-06-08 19:24:39.694533"], ["per_day_average_interest", "\"1\"=>\"10\",\"2\"=>\"3\""], ["updated_at", "2015-06-08 19:24:39.694533"]]
(21.4ms) COMMIT
=> true
irb(main):029:0> d = Company.where(:id => 44)
Company Load (0.5ms) SELECT "companies".* FROM "companies" WHERE "companies"."id" = 44
=> #<ActiveRecord::Relation [#<Company id: 44, name: nil, average: nil, created_at: "2015-06-08 19:24:39", updated_at: "2015-06-08 19:24:39", revenue_average: nil, country: nil, job: nil, model_name:
nil, average_daily_interest: nil, per_day_average_interest: {"1"=>"10", "2"=>"3"}>]>
irb(main):030:0> d.per_day_average_interest
NoMethodError: undefined method `per_day_average_interest' for #<Company::ActiveRecord_Relation:0x007fa16d296dd0>
from /home/action/.gem/ruby/2.1.1/gems/activerecord-4.1.0/lib/active_record/relation/delegation.rb:136:in `method_missing'
from /home/action/.gem/ruby/2.1.1/gems/activerecord-4.1.0/lib/active_record/relation/delegation.rb:99:in `method_missing'
from (irb):30
from /home/action/.gem/ruby/2.1.1/gems/railties-4.1.0/lib/rails/commands/console.rb:90:in `start'
from /home/action/.gem/ruby/2.1.1/gems/railties-4.1.0/lib/rails/commands/console.rb:9:in `start'
from /home/action/.gem/ruby/2.1.1/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:69:in `console'
from /home/action/.gem/ruby/2.1.1/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from /home/action/.gem/ruby/2.1.1/gems/railties-4.1.0/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
Am I querying it the wrong way? Is there something I am missing?
Thanks!

Answer 1

The where statement returns the collection of objects and your column belongs to one object so you need to do the following
d = Company.where(:id => 44).first

Answer 2

As you can see d is ActiveRecord::Relation object, which is a wrapper of the all Company objects after filtering using where. The reader method per_day_average_interest is defined on the Company model instance, so you need to call as I have shown below.
d.first.per_day_average_interest
if you want all the values d.pluck(:per_day_average_interest).