Question

我正在从Rails 3迁移到Rails 4，并且其中一个模型的以下关联导致错误：

has_many :unblocked_items, class_name: 'IncidentItem', 
          conditions: [
            'incident_items.item_type_id in (?) \
              AND (incident_blocking_file_id IS NULL OR incident_blocking_files.way = ? \
            )', 
            IncidentItemType.blockable, 
            BlockingWay.unblock
          ],
          include: :incident_blocking_file
has_many :blocked_items, class_name: 'IncidentItem',
          conditions: [
            'incident_items.item_type_id in (?) \
              AND (incident_blocking_file_id IS NOT NULL \
              AND (incident_blocking_files.way <> ? OR incident_blocking_files.way IS NULL) \
            )', 
            IncidentItemType.blockable, 
            BlockingWay.unblock
          ],
          include: :incident_blocking_file

我收到以下错误：

ArgumentError: Unknown key: :conditions. Valid keys are: :class_name, :anonymous_class, :foreign_key, :validate, :autosave, :table_name, :before_add, :after_add, :before_remove, :after_remove, :extend, :primary_key, :dependent, :as, :through, :source, :source_type, :inverse_of, :counter_cache, :join_table, :foreign_type (ArgumentError)

什么原因导致此错误？如何将这个模型及其关联从Rails 3迁移到Rails 4？

Answer 1

来自：https://edgeguides.rubyonrails.org/association_basics.html#scopes-for-has-many

4.3.3 has_many的范围

有时您可能希望自定义has_many使用的查询。可以通过范围框实现此类自定义。例如：

class Author < ApplicationRecord
  has_many :books, -> { where processed: true }
end

从Rails 3升级到Rails 4时，has_many关联的“ ArgumentError：未知键：: conditions”

1 个答案: