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# File 'lib/sequel/plugins/bitemporal.rb', line 42
def self.configure(master, opts = {})
version = opts[:version_class]
raise Error, "please specify version class to use for bitemporal plugin" unless version
return version.db.log_info("Version table does not exist for #{version.name}") unless version.db.table_exists?(version.table_name)
missing = bitemporal_version_columns - version.columns
raise Error, "bitemporal plugin requires the following missing column#{"s" if missing.size>1} on version class: #{missing.join(", ")}" unless missing.empty?
if Sequel::Plugins::Bitemporal.pg_jdbc?(master.db)
master.plugin :pg_typecast_on_load, *master.columns
elsif Sequel::Plugins::Bitemporal.jdbc?(master.db)
master.plugin :typecast_on_load, *master.columns
end
master.instance_eval do
@version_class = version
base_alias = opts.fetch :base_alias do
name ? underscore(demodulize(name)) : table_name
end
@versions_alias = "#{base_alias}_versions".to_sym
@current_version_alias = "#{base_alias}_current_version".to_sym
@audit_class = opts[:audit_class]
@audit_updated_by_method = opts.fetch(:audit_updated_by_method){ :updated_by }
@propagate_per_column = opts.fetch(:propagate_per_column, false)
@version_uses_string_nilifier = version.plugins.map(&:to_s).include? "Sequel::Plugins::StringNilifier"
@excluded_columns = Sequel::Plugins::Bitemporal.bitemporal_excluded_columns
@excluded_columns += Array opts[:excluded_columns] if opts[:excluded_columns]
@use_ranges = if opts[:ranges]
db = self.db
unless db.database_type==:postgres && db.server_version >= 90200
raise "Ranges require PostgreSQL 9.2"
end
true
else
false
end
end
master.class_eval do
def self.current_versions_dataset
t = ::Sequel::Plugins::Bitemporal.point_in_time
n = ::Sequel::Plugins::Bitemporal.now
version_class.where do
(created_at <= t) &
(Sequel.|({expired_at=>nil}, expired_at > t)) &
(valid_from <= n) &
(valid_to > n)
end
end
end
master.one_to_many :versions, class: version, key: :master_id, graph_alias_base: master.versions_alias
master.one_to_one :current_version, class: version, key: :master_id, graph_alias_base: master.current_version_alias, :graph_block=>(proc do |j, lj, js|
t = Sequel.delay{ ::Sequel::Plugins::Bitemporal.point_in_time }
n = Sequel.delay{ ::Sequel::Plugins::Bitemporal.now }
if master.use_ranges
master.existence_range_contains(t, j) &
master.validity_range_contains(n, j)
else
e = Sequel.qualify j, :expired_at
(Sequel.qualify(j, :created_at) <= t) &
(Sequel.|({e=>nil}, e > t)) &
(Sequel.qualify(j, :valid_from) <= n) &
(Sequel.qualify(j, :valid_to) > n)
end
end) do |ds|
t = Sequel.delay{ ::Sequel::Plugins::Bitemporal.point_in_time }
n = Sequel.delay{ ::Sequel::Plugins::Bitemporal.now }
if master.use_ranges
ds.where(master.existence_range_contains(t) & master.validity_range_contains(n))
else
ds.where do
(created_at <= t) &
(Sequel.|({expired_at=>nil}, expired_at > t)) &
(valid_from <= n) &
(valid_to > n)
end
end
end
master.def_dataset_method :with_current_version do
eager_graph(:current_version).where(
Sequel.negate(
Sequel.qualify(model.current_version_alias, :id) => nil
)
)
end
master.one_to_many :current_or_future_versions, class: version, key: :master_id, :graph_block=>(proc do |j, lj, js|
t = Sequel.delay{ ::Sequel::Plugins::Bitemporal.point_in_time }
n = Sequel.delay{ ::Sequel::Plugins::Bitemporal.now }
if master.use_ranges
master.existence_range_contains(t, j) &
(Sequel.qualify(j, :valid_to) > n) &
(Sequel.qualify(j, :valid_from) != Sequel.qualify(j, :valid_to))
else
e = Sequel.qualify j, :expired_at
(Sequel.qualify(j, :created_at) <= t) &
Sequel.|({e=>nil}, e > t) &
(Sequel.qualify(j, :valid_to) > n) &
(Sequel.qualify(j, :valid_from) != Sequel.qualify(j, :valid_to))
end
end) do |ds|
t = Sequel.delay{ ::Sequel::Plugins::Bitemporal.point_in_time }
n = Sequel.delay{ ::Sequel::Plugins::Bitemporal.now }
if master.use_ranges
existence_conditions = master.existence_range_contains t
ds.where{ existence_conditions & (:valid_to > n) & (:valid_from != :valid_to) }
else
ds.where do
(created_at <= t) &
Sequel.|({expired_at=>nil}, expired_at > t) &
(valid_to > n) &
(valid_from != valid_to)
end
end
end
master.def_dataset_method :with_current_or_future_versions do
eager_graph(:current_or_future_versions).where(
Sequel.negate(current_or_future_versions__id: nil)
)
end
version.many_to_one :master, class: master, key: :master_id
version.class_eval do
if Sequel::Plugins::Bitemporal.pg_jdbc?(master.db)
plugin :pg_typecast_on_load, *columns
elsif Sequel::Plugins::Bitemporal.jdbc?(master.db)
plugin :typecast_on_load, *columns
end
def current?
t = ::Sequel::Plugins::Bitemporal.point_in_time
n = ::Sequel::Plugins::Bitemporal.now
!new? &&
created_at.to_datetime<=t &&
(expired_at.nil? || expired_at.to_datetime>t) &&
valid_from.to_datetime<=n &&
valid_to.to_datetime>n
end
def destroy(opts={})
expand_previous_version = opts.fetch(:expand_previous_version){
valid_from.to_datetime>::Sequel::Plugins::Bitemporal.now
}
master.destroy_version self, expand_previous_version
end
end
unless opts[:delegate]==false
(version.columns-master.columns-master.excluded_columns).each do |column|
master.class_eval <<-EOS
def #{column}
pending_or_current_version.#{column} if pending_or_current_version
end
EOS
end
end
end
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