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e76c583b91
Having a large number of post-deploy migrations running out-of-numerical-sequence with pre-deploy migrations can be problematic. For example, if we have the sequence - db/migrate/2017... - add column - db/post_migrate/2018... - drop the column - db/migrate/2021... - add the same column again It will work fine in numerical order. But if you run the pre-deploy migrations **followed by** the post-deploy migrations, you will not get the same result. Our post-deploy system is designed to allow for seamless upgrades of Discourse. However, it is reasonable for us to only support this totally seamless experience for a limited period of time. This commit moves all post_deploy migrations which are more than 1 year old (i.e. more than 2 major Discourse versions ago) into the regular pre-deploy migrations directory. This limits the impact of any edge cases caused by out-of-numerical-sequence migrations.
42 lines
1.1 KiB
Ruby
42 lines
1.1 KiB
Ruby
# frozen_string_literal: true
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class RemoveAvgTimeFromTopicsPosts < ActiveRecord::Migration[6.0]
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disable_ddl_transaction!
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def up
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# this makes it re-runnable and also works if it was not created initially
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execute <<~SQL
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ALTER TABLE topics DROP COLUMN IF EXISTS avg_time
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SQL
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ActiveRecord::Base.transaction do
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execute "DROP VIEW badge_posts"
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execute <<~SQL
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ALTER TABLE posts DROP COLUMN IF EXISTS avg_time
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SQL
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# we must recreate this view every time we amend posts
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# p.* is auto expanded and persisted into the view definition
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# at create time
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execute <<~SQL
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CREATE VIEW badge_posts AS
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SELECT p.*
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FROM posts p
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JOIN topics t ON t.id = p.topic_id
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JOIN categories c ON c.id = t.category_id
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WHERE c.allow_badges AND
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p.deleted_at IS NULL AND
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t.deleted_at IS NULL AND
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NOT c.read_restricted AND
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t.visible AND
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p.post_type IN (1,2,3)
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SQL
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end
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end
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def down
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# do nothing re-runnable
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end
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end
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