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delete dup pvs in migration

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This commit is contained in:
Raphael Sofaer 2011-02-11 13:16:56 -08:00
parent 88da878c97
commit 2faf3fe10d
1 changed files with 23 additions and 0 deletions
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23
db/migrate/20110211204804_unique_index_post_visibilities.rb
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@ -1,5 +1,28 @@
class UniqueIndexPostVisibilities < ActiveRecord::Migration
def self.up
sql = <<-SQL
SELECT `post_visibilities`.post_id, `post_visibilities`.aspect_id FROM `post_visibilities`
GROUP BY post_id, aspect_id
HAVING COUNT(*)>1;
SQL
result = execute(sql)
dup_pvs = result.to_a
undesired_ids = []
dup_pvs.each do |arr|
post_id, aspect_id = arr
pv_ids = execute("
SELECT `post_visibilities`.id FROM `post_visibilities`
WHERE `post_visibilities`.post_id = #{post_id}
AND `post_visibilities`.aspect_id = #{aspect_id};"
)
pv_ids.pop
undesired_ids.concat(pv_ids)
end
execute("DELETE FROM `post_visibilities` WHERE `post_visibiilties`.id IN (#{undesired_ids.join(",")});") unless undesired_ids.empty?
remove_index :post_visibilities, [:aspect_id, :post_id]
add_index :post_visibilities, [:aspect_id, :post_id], :unique => true
end