class AddCommunityTopicsCountToCommunity < ActiveRecord::Migration
def up
add_column :communities, :community_topics_count, :integer, :default => 0
Community.reset_column_information
Community.all.each do |c|
Community.reset_counters(c.id, :community_topics)
end
end
end
Why do I get this error if I try to make counter cache?
-
13-01-2022 - |
質問
I'm using Rails 3.2.6
. When I try to make counter cache, I get this error somehow.
How can I fix this? I've done the same thing on this app but not on this model.
What's wrong with my code or association?
command bundle exec rake db:migrate
Log
== AddCommunityTopicsCountToCommunity: migrating =============================
-- add_column(:communities, :community_topics_count, :integer, {:default=>0})
-> 0.0635s
rake aborted!
An error has occurred, all later migrations canceled:
community_topics_count is marked as readonly
models/community.rb
...
has_many :community_topics
...
models/community_topic.rb
...
belongs_to :community, counter_cache: true
...
migration file
class AddCommunityTopicsCountToCommunity < ActiveRecord::Migration
def up
add_column :communities, :community_topics_count, :integer, :default => 0
Community.reset_column_information
Community.all.each do |p|
p.update_attribute :community_topics_count, p.community_topics.length
end
end
def down
remove_column :communities, :community_topics_count
end
end
解決
他のヒント
When you add a conter_cache
, it's not possible to updated it using Rails set it as read-only by default.
You can bypass this by replacing updated_attribute
with update_column
, which skips any validation or callbacks.
conter_cache
has its own methods to deal with, check the docs for details.
In your case you can use something like
Community.all.each do |p|
Community.reset_counters(p.id, :community_topics)
end
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