module Sequel::Plugins::PgXminOptimisticLocking::ClassMethods
Private Instance Methods
append_xmin_column_if_usable(ds)
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If the xmin column is not already selected, and selecting it does not raise an error, append it to the selections.
# File lib/sequel/plugins/pg_xmin_optimistic_locking.rb, line 57 def append_xmin_column_if_usable(ds) select = ds.opts[:select] unless select && select.include?(:xmin) xmin_ds = ds.select_append(:xmin) begin columns = xmin_ds.columns! rescue Sequel::DatabaseConnectionError, Sequel::DatabaseDisconnectError raise rescue Sequel::DatabaseError # ignore, could be view, subquery, table returning function, etc. else ds = xmin_ds if columns.include?(:xmin) end end ds end
convert_input_dataset(ds)
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Ensure the dataset selects the xmin column if doing so
Calls superclass method
# File lib/sequel/plugins/pg_xmin_optimistic_locking.rb, line 51 def convert_input_dataset(ds) append_xmin_column_if_usable(super) end