活动记录结果

result = ActiveRecord::Base.connection.exec_query('SELECT id, title, body FROM posts')
result # => #<ActiveRecord::Result:0xdeadbeef>

# Get the column names of the result:
result.columns
# => ["id", "title", "body"]

# Get the record values of the result:
result.rows
# => [[1, "title_1", "body_1"],
      [2, "title_2", "body_2"],
      ...
     ]

# Get an array of hashes representing the result (column => value):
result.to_a
# => [{"id" => 1, "title" => "title_1", "body" => "body_1"},
      {"id" => 2, "title" => "title_2", "body" => "body_2"},
      ...
     ]

# ActiveRecord::Result also includes Enumerable.
result.each do |row|
  puts row['title'] + " " + row['body']
end

#

• []

E

• each,
• empty?

I

• includes_column?,
• initialize_copy

L

• last,
• length

N

• new

T

• to_a,
• to_ary

• Enumerable

属性

类公共方法

# File activerecord/lib/active_record/result.rb, line 49
def initialize(columns, rows, column_types = {})
  @columns      = columns
  @rows         = rows
  @hash_rows    = nil
  @column_types = column_types
end

实例公共方法

# File activerecord/lib/active_record/result.rb, line 90
def [](idx)
  hash_rows[idx]
end

# File activerecord/lib/active_record/result.rb, line 70
def each(&block)
  if block_given?
    hash_rows.each(&block)
  else
    hash_rows.to_enum { @rows.size }
  end
end

# File activerecord/lib/active_record/result.rb, line 79
def empty?
  rows.empty?
end

# File activerecord/lib/active_record/result.rb, line 57
def includes_column?(name)
  @columns.include? name
end

# File activerecord/lib/active_record/result.rb, line 133
def initialize_copy(other)
  @columns      = columns.dup
  @rows         = rows.dup
  @column_types = column_types.dup
  @hash_rows    = nil
end

# File activerecord/lib/active_record/result.rb, line 95
def last(n = nil)
  n ? hash_rows.last(n) : hash_rows.last
end

# File activerecord/lib/active_record/result.rb, line 62
def length
  @rows.length
end

# File activerecord/lib/active_record/result.rb, line 84
def to_ary
  hash_rows
end