Mongoid Is it possible to override updated_at timestamp - ruby

Question

I am trying to manually edit the "updated_at" field through a rake task
Here is what it looks like:
task :campaigns_updated_at_recovery => :environment do
Dir.foreach('db/raw-data/campaigns/') do |json|
next if json == '.' or json == '..'
file = File.read('db/raw-data/campaigns/'+json)
data_hash = JSON.parse(file)
#p data_hash["_id"]
thisCampaign = Campaign.find(data_hash["_id"])
thisCampaign["channels"].each do |chan|
if chan["updated_at"] < Date.new(2018,04,19)
data_hash["channels"].each do |channel|
if chan["_id"].to_s == channel["_id"]
chan["updated_at"] = Date.parse(channel["updated_at"])
end
end
end
thisCampaign.save
end
end
However when I run this task, the updated_at date is either not changed or updated to today's date.
What am I missing ?
I am using Mongoid and not ActiveRecord by the way

Answer 1

updated_at is updated by mongoid itself in a callback.
You have two solution to work around that.
The easiest solution would be to use set to change the value directly without firing any callback:
thisCampaign.set(channels: thisCampaign['channels'])
The more flexible solution would be to go down to the driver level. The basic idea is:
Campaign.collection.find(_id: data_hash["_id"]).update_one({
'$set' => {
updated_at: yourDate
}
})
Given your example, you would first need to get the full document
thisCampaign = Campaign.collection.find(_id: data_hash["_id"]).first
if thisCampaign
thisCampaign["channels"].each do |chan|
if chan["updated_at"] < Date.new(2018,04,19)
data_hash["channels"].each do |channel|
if chan["_id"].to_s == channel["_id"]
chan["updated_at"] = Date.parse(channel["updated_at"])
end
end
end
end
Campaign.collection.find(_id: data_hash["_id"]).update_one({
'$set' => {channels: thisCampaign["channels"]}
})
end