Question

在rails console ..

Physician.find(1285849521)会产生

ArgumentError: wrong number of arguments (1 for 0)
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/postgresql/database_statements.rb:160:in `initialize'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/postgresql/database_statements.rb:160:in `new'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/postgresql/database_statements.rb:160:in `substitute_at'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation/query_methods.rb:989:in `block in create_binds'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation/query_methods.rb:987:in `each'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation/query_methods.rb:987:in `each_with_index'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation/query_methods.rb:987:in `create_binds'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation/query_methods.rb:962:in `build_where'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation/query_methods.rb:586:in `where!'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation/query_methods.rb:576:in `where'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/querying.rb:10:in `where'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/core.rb:150:in `block (2 levels) in find'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/statement_cache.rb:80:in `call'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/statement_cache.rb:80:in `create'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/core.rb:149:in `block in find'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/2.1.0/mutex_m.rb:73:in `synchronize'
... 13 levels...
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies.rb:246:in `load'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies.rb:246:in `block in load'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies.rb:237:in `load_dependency'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies.rb:246:in `load'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/commands/rails.rb:6:in `call'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/command_wrapper.rb:38:in `call'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:180:in `block in serve'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:153:in `fork'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:153:in `serve'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:128:in `block in run'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:122:in `loop'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:122:in `run'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application/boot.rb:18:in `<top (required)>'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/tim/.rbenv/versions/2.1.5/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'

当然..

Physician.find()导致“ActiveRecord :: RecordNotFound：找不到没有ID的医生”

我的医生.rb是

class Physician < ActiveRecord::Base
    self.table_name = "t_phys"
    self.primary_key = "sln"
end

我正在使用遗留的postgres数据库，表t_phys有一个名为sln的自然键，它是一个10位整数。数据库中有一位医生用sln 1285849521（上面的find方法中的整数），我知道因为Physician.all（）正常工作，这是显示的第一条记录。

我做错了什么？如何让find方法正常工作？我刚刚开始使用rails，可能是某个地方的新手错误。感谢帮助！

有关详细信息，当我访问localhost：3000 / physicians / 1285849521时，页面呈现：

ArgumentError in PhysiciansController#show

Wrong number of arguments (1 for 0)

Extracted source (around line #160):                

159        def substitute_at(column, index)
160          Arel::Nodes::BindParam.new "$#{index + 1}"
161        end
162
163        def exec_query(sql, name = 'SQL', binds = [])

如有必要，我可以提供完整的堆栈跟踪。

Answer 1

似乎它应该可以工作，但我想知道自定义主键是否仍然在弄乱find。

也许这个背景有助于确认这种或那种方式：

http://ruby-journal.com/how-to-override-default-primary-key-id-in-rails/

Answer 2

感谢上面的Todd Agulnick的评论，我更新了Rails 4.2 rc2，错误消失了。我遇到了一个新的错误，我已经解决了这个问题并且超出了这个问题的范围。谢谢Todd！

find方法ArgumentError＆＃34;错误的参数个数（1表示0）＆＃34;

2 个答案: