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FIX: base import script was not updating first_post_created_at column

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FEATURE: new rake task to update first_post_created_at column

The not-equal operator (`<>`) in PostgreSQL does not compare values
with NULL. We should instead use `IS DISTINCT FROM` when comparing
values with NULL.
This commit is contained in:
Arpit Jalan
2020-06-04 11:26:40 +05:30
parent 2188ccccd5
commit a93d24501c
2 changed files with 21 additions and 2 deletions
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19
lib/tasks/import.rake
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@ -497,3 +497,22 @@ task 'import:file', [:file_name] => [:environment] do |_, args|
ImportExport.import(args[:file_name])
puts "", "Done", ""
end
desc "Update first_post_created_at column in user_stats table"
task "import:update_first_post_created_at" => :environment do
puts "", "Updating first_post_created_at..."
DB.exec <<~SQL
WITH sub AS (
SELECT user_id, MIN(posts.created_at) AS first_post_created_at
FROM posts
GROUP BY user_id
)
UPDATE user_stats
SET first_post_created_at = sub.first_post_created_at
FROM user_stats u1
JOIN sub ON sub.user_id = u1.user_id
WHERE u1.user_id = user_stats.user_id
AND user_stats.first_post_created_at IS DISTINCT FROM sub.first_post_created_at
SQL
end