[英]Ruby NoMethodError: undefined method `messages' for []:Array
由于Google并没有帮助我解决这个问题,因此我想与其他遇到此问题的人分享它:
尝试保存模型时,我得到
NoMethodError: undefined method `messages' for []:Array
0: /.../active_record/autosave_association.rb:491:in `_ensure_no_duplicate_errors'
1: /.../active_support/callbacks.rb:413:in `block in make_lambda'
2: /.../active_support/callbacks.rb:246:in `block in halting'
3: /.../active_support/callbacks.rb:511:in `block in invoke_after'
4: /.../active_support/callbacks.rb:511:in `each'
5: /.../active_support/callbacks.rb:511:in `invoke_after'
6: /.../active_support/callbacks.rb:132:in `run_callbacks'
7: /.../active_support/callbacks.rb:825:in `_run_validation_callbacks'
8: /.../active_model/validations/callbacks.rb:110:in `run_validations!'
9: /.../active_model/validations.rb:335:in `valid?'
示例模型:
class Foo < ActiveRecord::Base
def do_stuff
@errors = []
@errors << 'Bad stuff' if self.bar > 4
@errors
end
end
示例代码:
foo = Foo.first
foo.do_stuff
foo.save # or foo.valid?, etc.
原因
出现此错误消息的原因是Foo
类创建实例级别@errors
变量。
ActiveRecord在模型的errors
变量中跟踪数据库错误。 当您尝试验证模型时,它将检查此变量中的错误消息。
解决方案
将@errors
更改为其他名称(例如@foo_errors
)。
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