Module: Sequel::SQL::PatternMatchMethods

Included in:
ComplexExpression, GenericExpression, StringAgg
Defined in:
lib/sequel/sql.rb

Overview

This module includes methods for overriding the =~ method for SQL equality, inclusion, and pattern matching. It returns the same result that Sequel would return when using a hash with a single entry, where the receiver was the key and the argument was the value. Example:

Sequel[:a] =~ 1 # (a = 1)
Sequel[:a] =~ [1, 2] # (a IN [1, 2])
Sequel[:a] =~ nil # (a IS NULL)

This also adds the !~ method, for easily setting up not equals, exclusion, and inverse pattern matching. This is the same as as inverting the result of the =~ method

Sequel[:a] !~ 1 # (a != 1)
Sequel[:a] !~ [1, 2] # (a NOT IN [1, 2])
Sequel[:a] !~ nil # (a IS NOT NULL)

Instance Method Summary collapse

Instance Method Details

#!~(other) ⇒ Object


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# File 'lib/sequel/sql.rb', line 811

def !~(other)
  ~(self =~ other)
end

#=~(other) ⇒ Object

Set up an equality, inclusion, or pattern match operation, based on the type of the argument.


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# File 'lib/sequel/sql.rb', line 807

def =~(other)
  BooleanExpression.send(:from_value_pair, self, other)
end