module Rein::Constraint::Length
This module contains methods for defining length constraints.
Constants
- OPERATORS
Public Instance Methods
add_length_constraint(*args)
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# File lib/rein/constraint/length.rb, line 16 def add_length_constraint(*args) reversible do |dir| dir.up { _add_length_constraint(*args) } dir.down { _remove_length_constraint(*args) } end end
remove_length_constraint(*args)
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# File lib/rein/constraint/length.rb, line 23 def remove_length_constraint(*args) reversible do |dir| dir.up { _remove_length_constraint(*args) } dir.down { _add_length_constraint(*args) } end end
Private Instance Methods
_add_length_constraint(table, attribute, options = {})
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# File lib/rein/constraint/length.rb, line 32 def _add_length_constraint(table, attribute, options = {}) name = Util.constraint_name(table, attribute, 'length', options) table = Util.wrap_identifier(table) attribute = Util.wrap_identifier(attribute) attribute_length = "length(#{attribute})" conditions = OPERATORS.slice(*options.keys).map do |key, operator| value = options[key] [attribute_length, operator, value].join(' ') end.join(' AND ') conditions = Util.conditions_with_if(conditions, options) sql = "ALTER TABLE #{table} ADD CONSTRAINT #{name} CHECK (#{conditions})" execute(Util.add_not_valid_suffix_if_required(sql, options)) end
_remove_length_constraint(table, attribute, options = {})
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# File lib/rein/constraint/length.rb, line 46 def _remove_length_constraint(table, attribute, options = {}) name = Util.constraint_name(table, attribute, 'length', options) table = Util.wrap_identifier(table) execute("ALTER TABLE #{table} DROP CONSTRAINT #{name}") end