Question

我有一个模型caleld SpacialBody，我需要播种一些记录，所以首先我把它添加到我的种子.rb

[
    ["Sol",0,0,0,"standard"]
].each do |body|
    nb=SpacialBody.find_or_create_by_name(body[0])
    nb.name = body[0]
    nb.x = body[1]
    nb.y = body[2]
    nb.type = SpacialBody::Types[body[3]]
    nb.class = body[4]
    nb.save
end

这会产生错误。然后我进入控制台测试代码，发现发生了这种情况：

SpacialBody.new     =＆GT; ＃     SpacialBody.find_by_name（ “太阳”）     =＆GT;零     SpacialBody.find_or_create_by_name（ “太阳”）     NoMethodError：未定义的方法generated_methods' for nil:NilClass from /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/whiny_nil.rb:52:in method_missing'         来自/var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/attribute_methods.rb:356:in respond_to?' from /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:2906:in assign_attributes'         来自/var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:2902:in each' from /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:2902:in assign_attributes'         来自/var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:2775:in attributes=' from /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:1965:in发送'         来自/var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:1965:in find_or_create_by_name' from /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:2475:in initialize'         来自/var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:1963:in new' from /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:1963:in find_or_create_by_name'         来自/var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:1975:in send' from /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:1975:in method_missing'         来自（irb）：3

我已经在其他项目中使用了find_or_create_by_field而没有重复，我在这里的设置中看不到任何不同。

只有这个模型有问题，同一项目中的其他模型才能正常工作。

Answer 1

捂脸

使用类和类型作为模型中的字段....不是一个好的举动

这两个都是保留名称，在构建方法时会导致ActiveRecord失败。

通过字段查找或创建不起作用

1 个答案: