Question

我想选择拥有的公司。我尝试了多种组合， new，rails 3，old school，... 所有这些组合都抛出相同的语法错误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) }

3年前似乎有人问过here，但似乎没有明确的答案！还有其他方法吗？ Google未返回belongs_to with conditions或with scope

的相关结果

我需要完全this，但确切的答案也在抛出语法错误......

Answer 1

意外＆＃39; \ n＆＃39;，期待=＆gt;

您需要使用scope

切换 options的顺序

# 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应为第二个参数，options应为第三个参数。

这应该有效

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

Rails：belongs_to，条件/范围引发语法错误

1 个答案: