Ruby on rails I'；m无法使用视图在旧表中保存activeRecord对象_Ruby On Rails_Postgresql_Activerecord_Rails Postgresql

Ruby on rails I'；m无法使用视图在旧表中保存activeRecord对象

ruby-on-rails postgresql activerecord

Ruby on rails I'；m无法使用视图在旧表中保存activeRecord对象,ruby-on-rails,postgresql,activerecord,rails-postgresql,Ruby On Rails,Postgresql,Activerecord,Rails Postgresql,我在遗留数据库中有一个表，该表有一个名为field的列。不可能将表直接链接到activeRecord模型，因为后者将尝试创建方法字段？这已经被定义了因此，我创建了一个视图来重命名字段，并创建了以下规则来允许插入、更新和删除 create or replace rule new_linked_fields_upd as on update to new_linked_fields do instead update linked_fields set race_id =

我在遗留数据库中有一个表，该表有一个名为field的列。不可能将表直接链接到activeRecord模型，因为后者将尝试创建方法字段？这已经被定义了

因此，我创建了一个视图来重命名字段，并创建了以下规则来允许插入、更新和删除

create or replace rule new_linked_fields_upd as on update to new_linked_fields 
     do instead 
     update linked_fields set race_id = new.race_id , master_id = new.master_id, field = new.field_name
     where id = new.id;

create or replace rule new_linked_fields_ins as on insert to new_linked_fields
     do instead
     insert into linked_fields select nextval('linked_fields_id_seq'), new.race_id, new.field_name, new.master_id;

create or replace rule new_linked_fields_del as on delete to new_linked_fields
     do instead
      delete from linked_fields where id = old.id;

我将activeRecord模型链接到视图

class LinkedField < ActiveRecord::Base
  self.table_name ="new_linked_fields"
  self.primary_key = "id"
end

返回以下错误

   (0.3ms)  BEGIN
  SQL (1.0ms)  INSERT INTO "new_linked_fields" ("field_name", "master_id", "race_id") VALUES ($1, $2, $3) RETURNING "id"  [["field_name", "toto"], ["master_id", 4], ["race_id", -3]]
   (0.3ms)  ROLLBACK
ActiveRecord::StatementInvalid: PG::Error: ERROR:  syntax error at end of input
LINE 1: DEALLOCATE
                   ^
: INSERT INTO "new_linked_fields" ("field_name", "master_id", "race_id") VALUES ($1, $2, $3) RETURNING "id"
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:297:in `exec'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:297:in `dealloc'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:287:in `delete'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:1172:in `rescue in exec_cache'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:1155:in `exec_cache'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:665:in `block in exec_query'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract_adapter.rb:280:in `block in log'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.6/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract_adapter.rb:275:in `log'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:663:in `exec_query'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract/database_statements.rb:63:in `exec_insert'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract/database_statements.rb:90:in `insert'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `insert'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/relation.rb:66:in `insert'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/persistence.rb:363:in `create'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/timestamp.rb:57:in `create'

有什么线索吗？我正在使用postgres 9.0和rails 3.2.6。

首先谢谢你，如果你能更新到PostgreSQL 9.1，那么要想正确使用它要比使用规则容易得多

其次，

DEALLOCATE

从何而来？它是在试图释放一份事先准备好的声明吗

尝试在

postgresql.conf

中启用

log\u语句='all'

，重新加载postgresql（

pg\u ctl reload

，

SIGHUP

邮局主管，或重新启动它），重新运行测试并检查pg的日志。查看Rails程序实际运行的SQL语句。

首先，如果您能够更新到PostgreSQL 9.1，那么这些语句比规则更容易正确

其次，

DEALLOCATE

从何而来？它是在试图释放一份事先准备好的声明吗

尝试在

postgresql.conf

中启用

log\u语句='all'

，重新加载postgresql（

pg\u ctl reload

，

SIGHUP

邮局主管，或重新启动它），重新运行测试并检查pg的日志。查看Rails程序实际运行的SQL。

谢谢Craig。Postgresql对这个问题给出了明确的解释。错误：无法对关系“新建链接的\u字段”执行插入返回提示：您需要一个带有返回子句的无条件on INSERT DO INSTEAD规则。现在的规则是：创建或替换规则新建链接的\u字段\u INSERT as on INSERT to new \u linked \u fields DO INSTEAD INSERT IN INTERT into linked \u fields select nextval（'链接的\u id \u seq'），new.race\u id、new.field\u name、new.master\u id返回链接的\u字段。*；您知道我是否还必须添加返回值以删除和更新规则吗？到目前为止，一切似乎都正常。@jlfenaux Re

返回关于插入、删除和更新规则的

子句，这是一个非常有趣的问题。我怀疑是这样，因为否则获取行数会很棘手，而且不可能使用

删除。。。返回

查询。看。如果有疑问，请通过

psql

在SQL级别对其进行测试。谢谢Craig。Postgresql对这个问题给出了明确的解释。错误：无法对关系“新建链接的\u字段”执行插入返回提示：您需要一个带有返回子句的无条件on INSERT DO INSTEAD规则。现在的规则是：创建或替换规则新建链接的\u字段\u INSERT as on INSERT to new \u linked \u fields DO INSTEAD INSERT IN INTERT into linked \u fields select nextval（'链接的\u id \u seq'），new.race\u id、new.field\u name、new.master\u id返回链接的\u字段。*；您知道我是否还必须添加返回值以删除和更新规则吗？到目前为止，一切似乎都正常。@jlfenaux Re

返回关于插入、删除和更新规则的

子句，这是一个非常有趣的问题。我怀疑是这样，因为否则获取行数会很棘手，而且不可能使用

删除。。。返回

查询。看。如果有疑问，请通过

psql

在SQL级别对其进行测试。

   (0.3ms)  BEGIN
  SQL (1.0ms)  INSERT INTO "new_linked_fields" ("field_name", "master_id", "race_id") VALUES ($1, $2, $3) RETURNING "id"  [["field_name", "toto"], ["master_id", 4], ["race_id", -3]]
   (0.3ms)  ROLLBACK
ActiveRecord::StatementInvalid: PG::Error: ERROR:  syntax error at end of input
LINE 1: DEALLOCATE
                   ^
: INSERT INTO "new_linked_fields" ("field_name", "master_id", "race_id") VALUES ($1, $2, $3) RETURNING "id"
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:297:in `exec'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:297:in `dealloc'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:287:in `delete'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:1172:in `rescue in exec_cache'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:1155:in `exec_cache'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:665:in `block in exec_query'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract_adapter.rb:280:in `block in log'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.6/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract_adapter.rb:275:in `log'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:663:in `exec_query'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract/database_statements.rb:63:in `exec_insert'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract/database_statements.rb:90:in `insert'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `insert'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/relation.rb:66:in `insert'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/persistence.rb:363:in `create'
     from /Users/macbook/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.6/lib/active_record/timestamp.rb:57:in `create'