Class: Array

### Home Classes Methods

### In Files

- lib/sequel/core_sql.rb

### Parent

Object

### Methods

- #all_two_pairs?
- #case
- #sql_array
- #sql_expr
- #sql_negate
- #sql_or
- #sql_string_join
- #~

### Files

- CHANGELOG
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- 3.6.0.txt
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- 3.9.0.txt
- sharding.rdoc
- sql.rdoc
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No matching classes.

# Array

Sequel extends the Array class to add methods to implement the SQL DSL. Most of these methods require that the array not be empty and that it must consist solely of other arrays that have exactly two elements.

### Public Instance Methods

all_two_pairs?() click to toggle source

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

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

case(default, expression = nil) click to toggle source

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/core_sql.rb, line 32
    def case(default, expression = nil)
      ::Sequel::SQL::CaseExpression.new(self, default, expression)
    end

sql_array() click to toggle source

Return a Sequel::SQL::Array created from this array. Used if this array contains all two pairs and you want it treated as an SQL array instead of a ordered hash-like conditions.

    [[1, 2], [3, 4]] # SQL: 1 = 2 AND 3 = 4
    [[1, 2], [3, 4]].sql_array # SQL: ((1, 2), (3, 4))

    # File lib/sequel/core_sql.rb, line 42
    def sql_array
      ::Sequel::SQL::SQLArray.new(self)
    end

sql_expr() click to toggle source

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 all two pairs specify this type of condition.

    [[: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/core_sql.rb, line 52
    def sql_expr
      sql_expr_if_all_two_pairs
    end

sql_negate() click to toggle source

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/core_sql.rb, line 61
    def sql_negate
      sql_expr_if_all_two_pairs(:AND, true)
    end

sql_or() click to toggle source

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/core_sql.rb, line 70
    def sql_or
      sql_expr_if_all_two_pairs(:OR)
    end

sql_string_join(joiner=nil) click to toggle source

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. This does not require that the array be made up of all two pairs.

    [: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/core_sql.rb, line 83
    def sql_string_join(joiner=nil)
      if joiner
        args = zip([joiner]*length).flatten
        args.pop
      else
        args = self
      end
      args = args.collect{|a| [Symbol, ::Sequel::SQL::Expression, ::Sequel::LiteralString, TrueClass, FalseClass, NilClass].any?{|c| a.is_a?(c)} ? a : a.to_s}
      ::Sequel::SQL::StringExpression.new(:'||', *args)
    end

~() click to toggle source

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/core_sql.rb, line 10
    def ~
      sql_expr_if_all_two_pairs(:OR, true)
    end

[Validate]

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