class ActiveRecord::Result

This class encapsulates a Result returned from calling exec_query on any database connection adapter. For example:

x = ActiveRecord::Base.connection.exec_query('SELECT * FROM foo')
x # => #<ActiveRecord::Result:0xdeadbeef>

Attributes

column_types[R]
columns[R]
rows[R]

Public Class Methods

new(columns, rows, column_types = {}) click to toggle source
# File lib/active_record/result.rb, line 13
def initialize(columns, rows, column_types = {})
  @columns      = columns
  @rows         = rows
  @hash_rows    = nil
  @column_types = column_types
end

Public Instance Methods

[](idx) click to toggle source
# File lib/active_record/result.rb, line 40
def [](idx)
  hash_rows[idx]
end
each() { |row| ... } click to toggle source
# File lib/active_record/result.rb, line 20
def each
  hash_rows.each { |row| yield row }
end
empty?() click to toggle source

Returns true if there are no records.

# File lib/active_record/result.rb, line 32
def empty?
  rows.empty?
end
initialize_copy(other) click to toggle source
# File lib/active_record/result.rb, line 48
def initialize_copy(other)
  @columns   = columns.dup
  @rows      = rows.dup
  @hash_rows = nil
end
last() click to toggle source
# File lib/active_record/result.rb, line 44
def last
  hash_rows.last
end
to_ary() click to toggle source
# File lib/active_record/result.rb, line 36
def to_ary
  hash_rows
end
to_hash() click to toggle source
# File lib/active_record/result.rb, line 24
def to_hash
  hash_rows
end

Private Instance Methods

hash_rows() click to toggle source
# File lib/active_record/result.rb, line 55
def hash_rows
  @hash_rows ||=
    begin
      # We freeze the strings to prevent them getting duped when
      # used as keys in ActiveRecord::Base's @attributes hash
      columns = @columns.map { |c| c.dup.freeze }
      @rows.map { |row|
        # In the past we used Hash[columns.zip(row)]
        #  though elegant, the verbose way is much more efficient
        #  both time and memory wise cause it avoids a big array allocation
        #  this method is called a lot and needs to be micro optimised
        hash = {}

        index = 0
        length = columns.length

        while index < length
          hash[columns[index]] = row[index]
          index += 1
        end

        hash
      }
    end
end