当我尝试将特定类保存到数据库时，我的应用开始抛出错误。我不确定到底是什么原因导致这种情况开始发生 - 过去几天我一直遇到各种数据库问题....

无论如何，我的模型似乎工作正常(它正在正确计算所有 before_save 值)，但随后它尝试保存到数据库并爆炸。

SQL (0.8ms)  INSERT INTO "portfolios" ("correlation_matrix", "created_at", "data", "mean_return", "std_dev", "updated_at", "weights") VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING "id"  [["correlation_matrix", "--- \n- - 1.0\n  - -0.4873114574375062\n- - -0.4873114574375062\n  - 1.0\n"], ["created_at", Sat, 16 Jun 2012 15:12:35 MDT -06:00], ["data", {"TSX"=>0.5, "VUSTX"=>0.5}], ["mean_return", #<BigDecimal:7fadb119b750,'0.488052381E-1',18(45)>], ["std_dev", #<BigDecimal:7fadb119b598,'0.7668705159 123244E-1',18(45)>], ["updated_at", Sat, 16 Jun 2012 15:12:35 MDT -06:00], ["weights", "--- \nTSX: 0.5\nVUSTX: 0.5\n"]]

抛出这个错误:

ActiveRecord::StatementInvalid: PG::Error: ERROR:  Syntax error near 'T' at position 5

我不知道这个错误是什么意思(或者这个“T”是什么......)，甚至不知道从哪里开始解决它......任何帮助将不胜感激。

我可以发布任何可能需要的信息来解决这个问题......

相关迁移:

  create_table :portfolios do |t|
    t.text :weights
    t.decimal :mean_return, :precision => 15, :scale => 10
    t.decimal :std_dev, :precision => 15, :scale => 10
    t.text :correlation_matrix
    t.hstore :data

    t.timestamps
  end

  execute "CREATE INDEX portfolios_gin_data_hstore ON portfolios USING GIN(data);"

完整堆栈跟踪:

    ActiveRecord::StatementInvalid: PG::Error: ERROR:  Syntax error near 'T' at position 5
: INSERT INTO "portfolios" ("correlation_matrix", "created_at", "data", "mean_return", "std_dev", "updated_at", "weights") VALUES ($1, $2, $3, $4,     $5, $6, $7) RETURNING "id"
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.    6/lib/active_record/connection_adapters/postgresql_adapter.rb:1164:in `get_last_result'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.    6/lib/active_record/connection_adapters/postgresql_adapter.rb:1164:in `exec_cache'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.    6/lib/active_record/connection_adapters/postgresql_adapter.rb:665:in `block in exec_query'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.    6/lib/active_record/connection_adapters/abstract_adapter.rb:280:in `block in log'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activesupport-3.2.6/lib/active_support/notifications/instrumenter.    rb:20:in `instrument'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.    6/lib/active_record/connection_adapters/abstract_adapter.rb:275:in `log'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.    6/lib/active_record/connection_adapters/postgresql_adapter.rb:663:in `exec_query'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.    6/lib/active_record/connection_adapters/abstract/database_statements.rb:63:in `exec_insert'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.    6/lib/active_record/connection_adapters/abstract/database_statements.rb:90:in `insert'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.    6/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `insert'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/relation.rb:66:in `insert'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/persistence.rb:363:in `create'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/timestamp.rb:57:in `create'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/callbacks.rb:268:in `block in     create'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activesupport-3.2.6/lib/active_support/callbacks.rb:403:in     `_run__772785567275930853__create__1186465801021498362__callbacks'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activesupport-3.2.6/lib/active_support/callbacks.rb:405:in     `__run_callback'
... 11 levels...
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/validations.rb:50:in `save'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/attribute_methods/dirty.rb:22:in     `save'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/transactions.rb:241:in `block (2     levels) in save'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/transactions.rb:295:in `block in     with_transaction_returning_status'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.    6/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/transactions.rb:208:in     `transaction'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/transactions.rb:293:in     `with_transaction_returning_status'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/transactions.rb:241:in `block in     save'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/transactions.rb:252:in     `rollback_active_record_state!'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/activerecord-3.2.6/lib/active_record/transactions.rb:240:in `save'
  from (irb):33
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/railties-3.2.6/lib/rails/commands/console.rb:47:in `start'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/railties-3.2.6/lib/rails/commands/console.rb:8:in `start'
  from /Users/brandon/.rvm/gems/ruby-1.9.3-p194@myapp/gems/railties-3.2.6/lib/rails/commands.rb:41:in `<top (required)>'
  from script/rails:6:in `require'
  from script/rails:6:in `<main>'

更新 1 根据要求提供一些模型代码。

宏观的东西:

attr_accessible :weights

serialize :correlation_matrix
serialize :weights

has_and_belongs_to_many :securities, :uniq => true
has_and_belongs_to_many :efficient_frontiers

before_validation :format_weights_tickers, :add_securities, :validate_weights, :set_weights_in_hstore, :build_correlation_matrix, :set_mean_return, :set_standard_deviation

validates_presence_of :mean_return, :std_dev, :securities, :correlation_matrix, :weights
validates_numericality_of :mean_return, :std_dev

validate :uniqueness_of_weights 

before_destroy :check_for_dependent

scope :by_std_dev, :order => 'std_dev ASC'

我能找到的与 HStore 列有关的所有内容 我真正使用 HStore 的目的是搜索特定的代码。这曾经有效......我不知道发生了什么变化。我可能已经升级了 Postgres(我正在摆弄自制软件)或者可能用 Rails 改变了一些东西。我确实尝试回到 3.2.3，但我遇到了同样的错误。

def self.find_by_hstore(search_key, search_value)  
  where("data @> (:key => :value)", :key => search_key.to_s, :value => search_value.to_s)
end  

def set_weights_in_hstore
  self.data = {} if self.data.nil?
  weights.each_pair {|ticker, weight| self.data[ticker.to_s] = weight}
end

如果这太不连贯，我可以发布整个模型。让我知道!

更新 #2 - 我在其他地方也遇到了类似的错误....

在简单的用户注册后......

SQL (10.9ms)  INSERT INTO "users" ("admin", "confirmation_sent_at", "confirmation_token", "confirmed_at", "created_at", "current_sign_in_at", "current_sign_in_ip", "data", "email", "encrypted_password", "last_email_at", "last_sign_in_at", "last_sign_in_ip", "name", "plan", "remember_created_at", "reset_password_sent_at", "reset_password_token", "selected_portfolio_id", "sign_in_count", "unconfirmed_email", "updated_at", "verified") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22, $23) RETURNING "id"  [["admin", false], ["confirmation_sent_at", Sat, 16 Jun 2012 20:37:07 MDT -06:00], ["confirmation_token", "7Xu15pMrV9zTNmofv8bD"], ["confirmed_at", nil], ["created_at", Sat, 16 Jun 2012 20:37:07 MDT -06:00], ["current_sign_in_at", nil], ["current_sign_in_ip", nil], ["data", {"min_rebalance_spacing"=>90 days, "max_contact_frequency"=>7 days, "allowable_drift"=>5}], ["email", "joe@what.com"], ["encrypted_password", "$2a$10$HNUmlYmcVXbBsyZRFCAB7e8c5mf6S9UOdWr/ZCz10y5Sg4gOh8Zvq"], ["last_email_at", Sat, 16 Jun 2012 20:37:07 MDT -06:00], ["last_sign_in_at", nil], ["last_sign_in_ip", nil], ["name", "Joe Blow"], ["plan", "basic"], ["remember_created_at", nil], ["reset_password_sent_at", nil], ["reset_password_token", nil], ["selected_portfolio_id", nil], ["sign_in_count", 0], ["unconfirmed_email", nil], ["updated_at", Sat, 16 Jun 2012 20:37:07 MDT -06:00], ["verified", false]]

20:37:07 log.1          | [ef4a7d55fb30e8fb82ac6c860e674bfc] [127.0.0.1] PG::Error: ERROR:  Syntax error near 'm' at position 5

20:37:07 log.1          | : INSERT INTO "users" ("admin", "confirmation_sent_at", "confirmation_token", "confirmed_at", "created_at", "current_sign_in_at", "current_sign_in_ip", "data", "email", "encrypted_password", "last_email_at", "last_sign_in_at", "last_sign_in_ip", "name", "plan", "remember_created_at", "reset_password_sent_at", "reset_password_token", "selected_portfolio_id", "sign_in_count", "unconfirmed_email", "updated_at", "verified") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22, $23) RETURNING "id"

UDPATE 3

我的数据库/用户表似乎发生了一些奇怪的事情。在迁移中加载环境时出现以下错误:

rake aborted!
PG::Error: ERROR:  relation "users" does not exist
LINE 4:              WHERE a.attrelid = '"users"'::regclass
                                        ^
:             SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc,         a.attnotnull
              FROM pg_attribute a LEFT JOIN pg_attrdef d
                ON a.attrelid = d.adrelid AND a.attnum = d.adnum
             WHERE a.attrelid = '"users"'::regclass
               AND a.attnum > 0 AND NOT a.attisdropped
             ORDER BY a.attnum

最佳答案

我刚刚在 Rails 3.2 上遇到了类似的问题。如果您不使用 Rails 主干(朝着 4.0 方向努力)，它本身不理解 hstore - 您需要定义一个序列化编码器(由 activerecord-postgres-hstore gem 提供) ，像这样:

class Example < ActiveRecord::Base
  serialize :data, ActiveRecord::Coders::Hstore
end

关于ruby-on-rails - Rails 3.2 Postgres 保存错误 "ActiveRecord::StatementInvalid: PG::Error: ERROR: Syntax error near ' T' 在位置 5"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11067120/