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byte[] 2021-05-15 13:50:47 -04:00
parent 952d7bca4f
commit e13d3ff62e
1 changed files with 16 additions and 11 deletions
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21
priv/repo/migrations/20210427022351_add_index_posts_on_topic_id_and_topic_position.exs
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@ -2,20 +2,25 @@ defmodule Philomena.Repo.Migrations.AddIndexPostsOnTopicIdAndTopicPosition do
use Ecto.Migration
def up do
execute("drop index index_posts_on_topic_id_and_topic_position;");
execute(
"""
execute("drop index index_posts_on_topic_id_and_topic_position;")
execute("""
with mismatched_ranks as (select id,rank from (select id, topic_position, (rank() over (partition by topic_id order by created_at,id asc))-1 as rank from posts) s where s.topic_position <> s.rank)
update posts set topic_position=mismatched_ranks.rank
from mismatched_ranks
where posts.id=mismatched_ranks.id;
""");
execute("create unique index index_posts_on_topic_id_and_topic_position on posts (topic_id, topic_position);");
""")
execute(
"create unique index index_posts_on_topic_id_and_topic_position on posts (topic_id, topic_position);"
)
end
def down do
execute("drop index index_posts_on_topic_id_and_topic_position;");
execute("create index index_posts_on_topic_id_and_topic_position on public.posts (topic_id, topic_position);");
end
execute("drop index index_posts_on_topic_id_and_topic_position;")
execute(
"create index index_posts_on_topic_id_and_topic_position on public.posts (topic_id, topic_position);"
)
end
end