Returns the list of all column definitions for a table.
# File activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb, line 195
def columns(table_name)
# Limit, precision, and scale are all handled by the superclass.
column_definitions(table_name).map do |column_name, type, default, notnull, oid, fmod|
oid = get_oid_type(oid.to_i, fmod.to_i, column_name, type)
default_value = extract_value_from_default(oid, default)
default_function = extract_default_function(default_value, default)
new_column(column_name, default_value, oid, type, notnull == 'f', default_function)
end
end