Array

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

# File lib/sequel/extensions/core_extensions.rb, line 29
def case(*args)
  ::Sequel::SQL::CaseExpression.new(self, *args)
end

Return a PGArray proxy to the receiver, using a specific database type if given. This is mostly useful as a short cut for creating PGArray objects that didn’t come from the database.

# File lib/sequel/extensions/pg_array.rb, line 457
def pg_array(type=nil)
  Sequel::Postgres::PGArray.new(self, type)
end

Return a Sequel::Postgres::JSONArray proxy to the receiver. This is mostly useful as a short cut for creating JSONArray objects that didn’t come from the database.

# File lib/sequel/extensions/pg_json.rb, line 166
def pg_json
  Sequel::Postgres::JSONArray.new(self)
end

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)

# File lib/sequel/extensions/core_extensions.rb, line 58
def sql_expr
  Sequel.expr(self)
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)

# File lib/sequel/extensions/core_extensions.rb, line 67
def sql_negate
  Sequel.negate(self)
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)

# File lib/sequel/extensions/core_extensions.rb, line 76
def sql_or
  Sequel.or(self)
end

Return a Sequel::SQL::StringExpression 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

# File lib/sequel/extensions/core_extensions.rb, line 89
def sql_string_join(joiner=nil)
  Sequel.join(self, joiner)
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))

# File lib/sequel/extensions/core_extensions.rb, line 42
def sql_value_list
  ::Sequel::SQL::ValueList.new(self)
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)

# File lib/sequel/extensions/core_extensions.rb, line 20
def ~
  Sequel.~(self)
end