discourse/lib/remap.rb

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class Remap
def initialize(from, to, regex: false, verbose: false)
@from = from
@to = to
@regex = regex
@verbose = verbose
end
def perform
sql = "SELECT table_name, column_name
FROM information_schema.columns
WHERE table_schema='public' and (data_type like 'char%' or data_type like 'text%') and is_updatable = 'YES'"
cnn = ActiveRecord::Base.connection.raw_connection
results = cnn.async_exec(sql).to_a
results.each do |result|
table_name = result["table_name"]
column_name = result["column_name"]
log "Remapping #{table_name} #{column_name}"
result = if @regex
cnn.async_exec("UPDATE #{table_name}
SET #{column_name} = regexp_replace(#{column_name}, $1, $2, 'g')
WHERE NOT #{column_name} IS NULL
AND #{column_name} <> regexp_replace(#{column_name}, $1, $2, 'g')", [@from, @to])
else
cnn.async_exec("UPDATE #{table_name}
SET #{column_name} = replace(#{column_name}, $1, $2)
WHERE NOT #{column_name} IS NULL
AND #{column_name} <> replace(#{column_name}, $1, $2)", [@from, @to])
end
log "#{result.cmd_tuples} rows affected!"
end
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Theme.expire_site_cache!
end
def log(message)
puts(message) if @verbose
end
end