discourse/db/migrate/20140715055242_add_quoted_p...

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class AddQuotedPosts < ActiveRecord::Migration
def change
create_table :quoted_posts do |t|
t.integer :post_id, null: false
t.integer :quoted_post_id, null: false
t.timestamps
end
add_index :quoted_posts, [:post_id, :quoted_post_id], unique: true
add_index :quoted_posts, [:quoted_post_id, :post_id], unique: true
# NOTE this can be done in pg but too much of a headache
id = 0
while id = backfill_batch(id, 1000); end
end
def backfill_batch(start_id, batch_size)
results = execute <<SQL
SELECT id, cooked
FROM posts
WHERE raw like '%quote=%' AND id > #{start_id}
ORDER BY id
LIMIT #{batch_size}
SQL
max_id = nil
results.each do |row|
post_id, max_id = row["id"].to_i
doc = Nokogiri::HTML.fragment(row["cooked"])
uniq = {}
doc.css("aside.quote[data-topic]").each do |a|
topic_id = a['data-topic'].to_i
post_number = a['data-post'].to_i
next if uniq[[topic_id,post_number]]
uniq[[topic_id,post_number]] = true
execute "INSERT INTO quoted_posts(post_id, quoted_post_id, created_at, updated_at)
SELECT #{post_id}, id, created_at, updated_at
FROM posts
WHERE post_number = #{post_number} AND
topic_id = #{topic_id}"
end
end
max_id
end
end