true if the array is not empty and all of its elements are arrays of size 2, false otherwise. This is used to determine if the array could be a specifier of conditions, used similarly to a hash but allowing for duplicate keys and a specific order.

   [].to_a.all_two_pairs? # => false
   [:a].to_a.all_two_pairs? # => false
   [[:b]].to_a.all_two_pairs? # => false
   [[:a, 1]].to_a.all_two_pairs? # => true

[Source]

    # File lib/sequel/core_sql.rb, line 23
23:   def all_two_pairs?
24:     !empty? && all?{|i| (Array === i) && (i.length == 2)}
25:   end

Return a Sequel::SQL::CaseExpression with this array as the conditions and the given default value and expression.

  [[{:a=>[2,3]}, 1]].case(0) # SQL: CASE WHEN a IN (2, 3) THEN 1 ELSE 0 END
  [[:a, 1], [:b, 2]].case(:d, :c) # SQL: CASE c WHEN a THEN 1 WHEN b THEN 2 ELSE d END

[Source]

    # File lib/sequel/core_sql.rb, line 32
32:   def case(*args)
33:     ::Sequel::SQL::CaseExpression.new(self, *args)
34:   end

Alias for sql_value_list

Return a Sequel::SQL::BooleanExpression created from this array, matching all of the conditions. Rarely do you need to call this explicitly, as Sequel generally assumes that arrays of two element arrays specify this type of condition. One case where it can be necessary to use this is if you are using the object as a value in a filter hash and want to use the = operator instead of the IN operator (which is used by default for arrays of two element arrays).

  [[:a, true]].sql_expr # SQL: a IS TRUE
  [[:a, 1], [:b, [2, 3]]].sql_expr # SQL: a = 1 AND b IN (2, 3)

[Source]

    # File lib/sequel/core_sql.rb, line 61
61:   def sql_expr
62:     sql_expr_if_all_two_pairs
63:   end

Return a Sequel::SQL::BooleanExpression created from this array, matching none of the conditions.

  [[:a, true]].sql_negate # SQL: a IS NOT TRUE
  [[:a, 1], [:b, [2, 3]]].sql_negate # SQL: a != 1 AND b NOT IN (2, 3)

[Source]

    # File lib/sequel/core_sql.rb, line 70
70:   def sql_negate
71:     sql_expr_if_all_two_pairs(:AND, true)
72:   end

Return a Sequel::SQL::BooleanExpression created from this array, matching any of the conditions.

  [[:a, true]].sql_or # SQL: a IS TRUE
  [[:a, 1], [:b, [2, 3]]].sql_or # SQL: a = 1 OR b IN (2, 3)

[Source]

    # File lib/sequel/core_sql.rb, line 79
79:   def sql_or
80:     sql_expr_if_all_two_pairs(:OR)
81:   end

Return a Sequel::SQL::BooleanExpression representing an SQL string made up of the concatenation of this array‘s elements. If an argument is passed it is used in between each element of the array in the SQL concatenation.

  [:a].sql_string_join # SQL: a
  [:a, :b].sql_string_join # SQL: a || b
  [:a, 'b'].sql_string_join # SQL: a || 'b'
  ['a', :b].sql_string_join(' ') # SQL: 'a' || ' ' || b

[Source]

     # File lib/sequel/core_sql.rb, line 92
 92:   def sql_string_join(joiner=nil)
 93:     if joiner
 94:       args = zip([joiner]*length).flatten
 95:       args.pop
 96:     else
 97:       args = self
 98:     end
 99:     args = args.collect{|a| [Symbol, ::Sequel::SQL::Expression, ::Sequel::LiteralString, TrueClass, FalseClass, NilClass].any?{|c| a.is_a?(c)} ? a : a.to_s}
100:     ::Sequel::SQL::StringExpression.new('||''||', *args)
101:   end

Return a Sequel::SQL::ValueList created from this array. Used if this array contains all two element arrays and you want it treated as an SQL value list (IN predicate) instead of as a conditions specifier (similar to a hash). This is not necessary if you are using this array as a value in a filter, but may be necessary if you are using it as a value with placeholder SQL:

  DB[:a].filter([:a, :b]=>[[1, 2], [3, 4]]) # SQL: (a, b) IN ((1, 2), (3, 4))
  DB[:a].filter('(a, b) IN ?', [[1, 2], [3, 4]]) # SQL: (a, b) IN ((1 = 2) AND (3 = 4))
  DB[:a].filter('(a, b) IN ?', [[1, 2], [3, 4]].sql_value_list) # SQL: (a, b) IN ((1, 2), (3, 4))

[Source]

    # File lib/sequel/core_sql.rb, line 45
45:   def sql_value_list
46:     ::Sequel::SQL::ValueList.new(self)
47:   end

Return a Sequel::SQL::BooleanExpression created from this array, not matching all of the conditions.

  ~[[:a, true]] # SQL: a IS NOT TRUE
  ~[[:a, 1], [:b, [2, 3]]] # SQL: a != 1 OR b NOT IN (2, 3)

[Source]

    # File lib/sequel/core_sql.rb, line 10
10:   def ~
11:     sql_expr_if_all_two_pairs(:OR, true)
12:   end