Sha256: 0861501ebb4d0a15be6b76e6fa2fcf6a0d7cbe49483a24f029a5d65f9daadd94
Contents?: true
Size: 1.41 KB
Versions: 5
Compression:
Stored size: 1.41 KB
Contents
module PactBroker
module Versions
class Sequence < Sequel::Model(:version_sequence_number)
dataset_module do
# The easiest way to implement a cross database compatible sequence.
# Sad, I know.
def next_val
if PactBroker::Dataset::Helpers.postgres?
db.execute("SELECT nextval('version_order_sequence') as val") { |v| v.first["val"].to_i }
else
db.transaction do
for_update.first
select_all.update(value: Sequel[:value]+1)
row = first
if row
row.value
else
# The first row should have been created in the migration, so this code
# should only ever be executed in a test context, after we've truncated all the
# tables after a test.
# There would be a risk of a race condition creating two rows if this
# code executed in prod, as I don't think you can lock an empty table
# to prevent another record being inserted.
max_version_order = PactBroker::Domain::Version.max(:order)
value = max_version_order ? max_version_order + 100 : 1
insert(value: value)
value
end
end
end
end
end
end
end
end
# Table: version_sequence_number
# Columns:
# value | integer | NOT NULL
Version data entries
5 entries across 5 versions & 1 rubygems