Rails:带有条件/范围抛出语法错误的belongs_to [英] Rails: belongs_to with conditions/scope throwing syntax error

问题描述

我想挑选一家拥有的公司.我尝试了多种组合，例如新的，rails 3，旧式的...... ，所有组合都抛出相同的语法错误unexpected '\n', expecting =>

I want to pick companies that are owned. I tried multiple combinations, new, rails 3, old school,... all of which are throwing the same syntax error unexpected '\n', expecting =>

belongs_to :from, class_name: 'Company', foreign_key: 'from_id', -> { where owned: true }
belongs_to :from, class_name: 'Company', foreign_key: 'from_id', -> { where(owned: true) }
belongs_to :from, class_name: 'Company', foreign_key: 'from_id', -> { where(:owned => true) }
belongs_to :from, class_name: 'Company', foreign_key: 'from_id', condition: { where(:owned => true) }

有人似乎在3年前问过了这里，但是似乎没有确切的答案！还有其他办法吗? Google没有返回belongs_to with conditions或with scope

Someone seems to have asked it 3 years ago here, but there seems to be no definitive answer! Is there any other way? Google's not returning relevant results for belongs_to with conditions or with scope

我需要完全此，但是该确切答案也将引发语法错误...

I need to do exactly this, but that exact answer's throwing syntax error too...

推荐答案

意外的'\ n'，期望=>

unexpected '\n', expecting =>

您需要将的顺序与options

# File activerecord/lib/active_record/associations.rb, line 1514
def belongs_to(name, scope = nil, options = {})
  reflection = Builder::BelongsTo.build(self, name, scope, options)
  Reflection.add_reflection self, name, reflection
end

如您所见，scope应该是第二个参数，而options应该是第三个​​参数.

As you can see, the scope should be the second parameter and options should be the third parameter.

这应该有效

belongs_to :from, -> { where owned: true }, class_name: 'Company', foreign_key: 'from_id'

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