ruby-on-rails - 我怎样才能添加额外的条件来计算？

Question

这计算了代码通知为 的用户数true，他的个人资料notification为true

@count = User.joins(:profile, :codes => :community).where("profiles.notification=? AND codes.notification=? AND communities.id=?", true, true, @community.id).count

我正在使用调用acts_as_paranoid逻辑删除的 gem。有了这个，上面的行包括已删除的具有日期时间的记录user.deleted_at。

我想排除那些已删除的记录。
我怎样才能在上面添加这个额外的条件？

像这样的东西？

@count = User.joins(:profile, :codes => :community).where("user.deleted_at=? AND profiles.notification=? AND codes.notification=? AND communities.id=?", nil, true, true, @community.id).count

Answer 1

您也可以尝试在模型上使用范围：

class User < ActiveRecord::Base
    scope :not_deleted, where(:deleted_at => nil)
end

然后做：（注意User.not_deleted.joins...）

@count = User.not_deleted.joins(:profile, :codes => :community).where("profiles.notification=? AND codes.notification=? AND communities.id=?", true, true, @community.id).count

Answer 2

That looks right to me, but user.deleted_at should be users.deleted_at.

- @count = User.joins(:profile, :codes => :community).where("user.deleted_at=? AND profiles.notification=? AND codes.notification=? AND communities.id=?", nil, true, true, @community.id).count
+ @count = User.joins(:profile, :codes => :community).where("users.deleted_at=? AND profiles.notification=? AND codes.notification=? AND communities.id=?", nil, true, true, @community.id).count

The SQL generated by Rails uses the plural table name (users) instead of the singular model name (user).