的SQLite3 ::的SQLException：在迁移

Question

迁移：

class AddUserIdToPhotos < ActiveRecord::Migration 
    def self.up 
    add_column :photos, :user_id, :integer 
    execute 'update photos inner join albums on albums.id = photos.album_id set photos.user_id = albums.user_id' 
    end 

    def self.down 
    remove_column :photos, :user_id 
    end 
end 

耙分贝：迁移，显示错误：

-- add_column(:photos, :user_id, :integer) -> 0.0010s -- execute("update photos inner join albums on albums.id = photos.album_id set photos.user_id = albums.user_id") rake aborted! StandardError: An error has occurred, this and all later migrations canceled:

SQLite3::SQLException: near "inner": syntax error: update photos inner join albums on albums.id = photos.album_id set photos.user_id = albums.user_id/home/borowskiy/projects/galaxy/bdsmgalaxy/db/migrate/20110731191428_add_user_id_to_photos.rb:4:in `up'

与跟踪：

SQLite3::SQLException: near "inner": syntax error: update photos inner join albums on albums.id = photos.album_id set photos.user_id = albums.user_id/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.10/lib/sqlite3/database.rb:91:in `initialize' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.10/lib/sqlite3/database.rb:91:in `new' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.10/lib/sqlite3/database.rb:91:in `prepare' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.10/lib/sqlite3/database.rb:134:in `execute' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/sqlite_adapter.rb:278:in `block in execute' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_adapter.rb:280:in `block in log' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activesupport-3.2.22/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_adapter.rb:275:in `log' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rack-mini-profiler-0.9.7/lib/patches/db/activerecord.rb:17:in `log_with_miniprofiler' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/sqlite_adapter.rb:278:in `execute' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:466:in `block in method_missing' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:438:in `block in say_with_time' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/benchmark.rb:281:in `measure' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:438:in `say_with_time' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:458:in `method_missing' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:334:in `method_missing' 
/home/borowskiy/projects/galaxy/bdsmgalaxy/db/migrate/20110731191428_add_user_id_to_photos.rb:4:in `up' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:370:in `up' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:410:in `block (2 levels) in migrate' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/benchmark.rb:281:in `measure' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:410:in `block in migrate' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_pool.rb:129:in `with_connection' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:389:in `migrate' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:528:in `migrate' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:720:in `block (2 levels) in migrate' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:775:in `call' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:775:in `block in ddl_transaction' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/transactions.rb:208:in `transaction' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:775:in `ddl_transaction' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:719:in `block in migrate' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:700:in `each' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:700:in `migrate' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:570:in `up' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/migration.rb:551:in `migrate' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:193:in `block (2 levels) in <top (required)>' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `call' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `block in execute' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `each' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `execute' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:179:in `block in invoke_with_call_chain' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:172:in `invoke_with_call_chain' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:165:in `invoke' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:150:in `invoke_task' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `block (2 levels) in top_level' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `each' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `block in top_level' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:115:in `run_with_threads' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:100:in `top_level' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:78:in `block in run' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:176:in `standard_exception_handling' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:75:in `run' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/rake-10.4.2/bin/rake:33:in `<top (required)>' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/bin/rake:23:in `load' 
/home/borowskiy/.rbenv/versions/2.0.0-p247/bin/rake:23:in `<main>' 
Tasks: TOP => db:migrate 

Answer 1

您的SQL查询是错误的。正确的SQL更新查询应该是这样的

update photos set photos.user_id = albums.user_id from albums where albums.id = photos.album_id 

请改变你的文件迁移到这个

class AddUserIdToPhotos < ActiveRecord::Migration 
    def self.up 
    add_column :photos, :user_id, :integer 
    execute "update photos set photos.user_id = albums.user_id from albums where albums.id = photos.album_id" 
    end 

    def self.down 
    remove_column :photos, :user_id 
    end 
end 

并重新运行。