Question

我希望将附件范围限制为尚未分配给评论的current_user附件或附件，以便稍后find

附件has_one :comment, optional: true

附件has_one :user, through :comment，评论 - 通过任务，任务 - 通过项目

> user.attachments.to_sql
=> "SELECT \"attachments\".* FROM \"attachments\" INNER JOIN \"comments\" ON \"attachments\".\"comment_id\" = \"comments\".\"id\" INNER JOIN \"tasks\" ON \"comments\".\"task_id\" = \"tasks\".\"id\" INNER JOIN \"projects\" ON \"tasks\".\"project_id\" = \"projects\".\"id\" WHERE \"projects\".\"user_id\" = $1 ORDER BY \"comments\".\"created_at\" ASC, tasks.position"

如何使其发挥作用

> user.attachments.or(Attachment.where(comment_id: nil))
Relation passed to #or must be structurally compatible. Incompatible values: [:order, :joins, :references]

我试过了

  without_comment = Attachment.joins(comment: [task: [:project]]).where(comment_id: nil).order('"comments"."created_at" ASC, tasks.position')
  user.attachments.or(without_comment)

[35] pry(#<AttachmentResource>)> without_comment.to_sql
=> "SELECT \"attachments\".* FROM \"attachments\" INNER JOIN \"comments\" ON \"comments\".\"id\" = \"attachments\".\"comment_id\" INNER JOIN \"tasks\" ON \"tasks\".\"id\" = \"comments\".\"task_id\" INNER JOIN \"projects\" ON \"projects\".\"id\" = \"tasks\".\"project_id\" WHERE \"attachments\".\"comment_id\" IS NULL ORDER BY \"comments\".\"created_at\" ASC, tasks.position"
[36] pry(#<AttachmentResource>)> user.attachments.or(without_comment)
ArgumentError: Relation passed to #or must be structurally compatible. Incompatible values: [:order, :joins, :references]
from /home/bjorn/.rvm/gems/ruby-2.4.1@ngrx-todolist/gems/activerecord-5.1.1/lib/active_record/relation/query_methods.rb:655:in `or!'

我想找到所有current_user附件以及没有所有者的附件 - ＆gt;没有家长评论

查询Attachment.joins(comment: [task: [:project]]).where('projects.user_id = ? OR attachments.comment_id IS NULL', user.id)不包括没有评论的附件，为什么？

[10] pry(#<CommentResource>)> Attachment.all
=> [#<Attachment:0x00000008a6f3a8
  id: 1,
  file: "attachments.rb",
  comment_id: 1,
  created_at: Sun, 21 May 2017 14:18:21 UTC +00:00,
  updated_at: Sun, 21 May 2017 14:18:21 UTC +00:00>,
 #<Attachment:0x00000008a6f268
  id: 2,
  file: "attachments.rb",
  comment_id: 1,
  created_at: Sun, 21 May 2017 14:18:21 UTC +00:00,
  updated_at: Sun, 21 May 2017 14:18:21 UTC +00:00>,
 #<Attachment:0x00000008a6f128
  id: 3,
  file: "attachments.rb",
  comment_id: nil,
  created_at: Sun, 21 May 2017 14:29:51 UTC +00:00,
  updated_at: Sun, 21 May 2017 14:29:51 UTC +00:00>]
[11] pry(#<CommentResource>)> Attachment.joins(comment: [task: [:project]]).where('projects.user_id = ? OR attachments.comment_id IS NULL', user.id).to_sql
=> "SELECT \"attachments\".* FROM \"attachments\" INNER JOIN \"comments\" ON \"comments\".\"id\" = \"attachments\".\"comment_id\" INNER JOIN \"tasks\" ON \"tasks\".\"id\" = \"comments\".\"task_id\" INNER JOIN \"projects\" ON \"projects\".\"id\" = \"tasks\".\"project_id\" WHERE (projects.user_id = 1 OR attachments.comment_id IS NULL)"
[12] pry(#<CommentResource>)> Attachment.joins(comment: [task: [:project]]).where('projects.user_id = ? OR attachments.comment_id IS NULL', user.id)
=> [#<Attachment:0x0000000891c7a8
  id: 1,
  file: "attachments.rb",
  comment_id: 1,
  created_at: Sun, 21 May 2017 14:18:21 UTC +00:00,
  updated_at: Sun, 21 May 2017 14:18:21 UTC +00:00>,
 #<Attachment:0x0000000891c668
  id: 2,
  file: "attachments.rb",
  comment_id: 1,
  created_at: Sun, 21 May 2017 14:18:21 UTC +00:00,
  updated_at: Sun, 21 May 2017 14:18:21 UTC +00:00>]

Answer 1

感谢@fanta

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Rails，如何使用has_many合并两个约束：through

1 个答案: