I added a counter_cache to an existing parent-child model pair and
wanted to set all the values for the counter_cache but can't do it
using update_attribute (or a number of other methods).
Should I create a bug report?
I created a simple test app in 2.2.1 to isolate the problem.
# create the learner and learner_session models and migrations:
script/generate model learner name:string learner_session_id:integer
script/generate model learner_session learner_id:integer
rake db:migrate
# add the associations to the models:
class Learner < ActiveRecord::Base
has_many :learner_sessions
end
class LearnerSession < ActiveRecord::Base
belongs_to :learner
end
# create a learner and 2 learner sessions without a counter_cache
$ script/console
>> l = Learner.create(:name => "stephen")
=> #<Learner id: 1, name: "stephen", learner_session_id: nil>
>> l.learner_sessions.create
=> #<LearnerSession id: 1, learner_id: 1>
>> l.learner_sessions.create
=> #<LearnerSession id: 2, learner_id: 1>
>> l.learner_sessions.count
=> 2
# now run this migration:
class AddCounterCacheToLearners < ActiveRecord::Migration
def self.up
add_column :learners, :learner_sessions_count, :integer, :default => 0
# Learner.reset_column_information
end
def self.down
remove_column :learners, :learner_sessions_count
end
end
# and add the counter_cache to the belongs_to association
class LearnerSession < ActiveRecord::Base
belongs_to :learner, :counter_cache => true
end
# back into script/console
$ script/console
>> l = Learner.find(:first)
=> #<Learner id: 1, name: "stephen", learner_session_id: nil,
learner_sessions_count: 0>
# there are still 2 learner sessions:
>> l.learner_sessions.count
=> 2
# but the learner_sessions_count is not set yet:
>> l.learner_sessions_count
=> 0
# update the learner_sessions_count:
>> l.update_attribute(:learner_sessions_count, 2)
=> true
# it is written to the model object:
>> l
=> #<Learner id: 1, name: "stephen", learner_session_id: nil,
learner_sessions_count: 2>
>> l.learner_sessions_count
=> 2
# but not to the database
>> l = Learner.find(:first)
=> #<Learner id: 1, name: "stephen", learner_session_id: nil,
learner_sessions_count: 0>
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