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|
module ActiveRecord
###
# 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>
class Result
include Enumerable
IDENTITY_TYPE = Class.new { def type_cast(v); v; end }.new # :nodoc:
attr_reader :columns, :rows, :column_types
def initialize(columns, rows, column_types = {})
@columns = columns
@rows = rows
@hash_rows = nil
@column_types = column_types
end
def identity_type # :nodoc:
IDENTITY_TYPE
end
def each
if block_given?
hash_rows.each { |row| yield row }
else
hash_rows.to_enum
end
end
def to_hash
hash_rows
end
alias :map! :map
alias :collect! :map
# Returns true if there are no records.
def empty?
rows.empty?
end
def to_ary
hash_rows
end
def [](idx)
hash_rows[idx]
end
def last
hash_rows.last
end
def initialize_copy(other)
@columns = columns.dup
@rows = rows.dup
@hash_rows = nil
end
private
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|
Hash[columns.zip(row)]
}
end
end
end
end
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