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class SiteStatistic < ActiveRecord::Base
# prevents the creation of multiple rows
default_value_for :id, 1
COUNTER_ATTRIBUTES = %w(repositories_count wikis_count).freeze
# https://dev.mysql.com/doc/refman/5.5/en/error-messages-server.html
MYSQL_NO_SUCH_TABLE = 1146
def self.track(raw_attribute)
with_statistics_available(raw_attribute) do |attribute|
SiteStatistic.update_all(["#{attribute} = #{attribute}+1"])
end
end
def self.untrack(raw_attribute)
with_statistics_available(raw_attribute) do |attribute|
SiteStatistic.update_all(["#{attribute} = #{attribute}-1 WHERE #{attribute} > 0"])
end
end
def self.with_statistics_available(raw_attribute)
unless raw_attribute.in?(COUNTER_ATTRIBUTES)
raise ArgumentError, "Invalid attribute: '#{raw_attribute}' to '#{caller_locations(1, 1)[0].label}' method. " \
"Valid attributes are: #{COUNTER_ATTRIBUTES.join(', ')}"
end
# we have quite a lot of specs testing migrations, we need this and the rescue to not break them
SiteStatistic.transaction(requires_new: true) do
SiteStatistic.first_or_create if Rails.env.test? # make sure SiteStatistic exists during tests
attribute = self.connection.quote_column_name(raw_attribute)
yield(attribute)
end
rescue ActiveRecord::StatementInvalid => ex
# we want to ignore this so we don't break the migration specs
unless ex.original_exception.is_a?(PG::UndefinedTable) ||
(ex.original_exception.is_a?(Mysql2::Error) && ex.original_exception.error_number == MYSQL_NO_SUCH_TABLE)
raise ex
end
end
def self.fetch
SiteStatistic.first_or_create!
end
end
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