49 lines
1.6 KiB
Ruby
49 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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class CorrectPostsSchema < ActiveRecord::Migration[6.0]
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# In the past, rails changed the default behavior for varchar columns
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# This only affects older discourse installations
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# This migration removes the character limits from posts columns, so that they match modern behavior
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#
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# To modify the posts table schema we need to recreate the badge_posts view
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# This should be done in a transaction
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def up
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result = DB.query <<~SQL
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SELECT character_maximum_length
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FROM information_schema.columns
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WHERE table_schema='public'
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AND table_name = 'posts'
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AND column_name IN ('action_code', 'edit_reason')
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SQL
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# No need to continue if the schema is already correct
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return if result.all? { |r| r.character_maximum_length.nil? }
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execute "DROP VIEW badge_posts"
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execute "ALTER TABLE posts ALTER COLUMN action_code TYPE varchar"
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execute "ALTER TABLE posts ALTER COLUMN edit_reason TYPE varchar"
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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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def down
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raise ActiveRecord::IrreversibleMigration
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end
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end
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