Question

在我的应用中，用户最多可以创建两个别名。我知道如何构建对html的检查，这将禁用创建另一个别名的选项，如果他们已经有两个。但是，如何在模型中构建此限制？

编辑：我知道我可以在表单上添加条件，但我想将条件放入我的控制器中。这就是我想要弄清楚的。

Answer 1

使用count。如果用户组的数量大于或等于2，则阻止创建新组。

Answer 2

在别名模型中，添加自定义验证以计算当前用户的别名数：

class UsersController < ApplicationController
  # include actions pertain to users model
end

class IssuesController < ApplicationController
  def index
    @issue = Issue.all
    @issue = @issue.paginate(page: params[:page], per_page:10)
    @issue = @issue.order("created_at DESC")
  end
end

class ProductionReportsController < ApplicationController
  def new
    @issue = Issue.find(params[:id])
    # if you were to use belongs_to and has_many design, I mentioned above
    @production_report = @issue.production_reports.build
    # or not 
    @production_report = ProductionReport.new
  end

  def create
    @issue = Issue.find(params[:id])
    # if you were to use belongs_to and has_many design, I mentioned above
    @production_report = @issue.production_reports.build(production_report_params)
    # or not
    @production_report = ProductionReport.new(production_report_params)

    if @production_report.save
      flash[:notice] = "production Saved Successfully!!!"
      redirect_to issues_url
    else
      # logic for failed save, repopulate the form with validation errors
    end    
  end
end

Rails - 如何限制用户生成的创建操作？

2 个答案: