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I have Discussions (polymorphic) that belong to Projects, Tasks and Subtasks. Tasks belong to Projects, and Subtasks to Tasks.

I have users connected to Projects via join table called 'synapses'. Synapse model has user_id, project_id and boolean field called :leader which signals if the user has leader (AKA admin) rights.

For a user to close(finish) the discussion, he needs to be a leader of current project or needs to be the creator of that discussion. Here is the 'finish' method in Discussions controller:

 33   def finish
 34     if current_user.leader? || current_user.discussions.include?(@discussion)
 35       @discussion.update_attribute(:finished, true)
 36       redirect_to polymorphic_path([@parent, Discussion])
 37       flash[:notice] = "Discussion '#{@discussion.name}' finished"
 38     else
 39       flash[:alert] = 'You must be an admin to do that'
 40     end
 41   end

Since user model doesn't have leader attribute on itself, I need to find the corresponding synapse between current user and project(which does have leader boolean field, showing if the user can close the discussion). Here is the method I have in application_controller to find the synapse:

  9   def find_synapse(user,project)  
 10     user.synapses.find_by_project_id(project)
 11   end

To find the synapse, I need to find the Project. So far I can find the parent of the Discussion, which can be either the Project, Task, or Subtask model.

The way I see it, I need to iterate through parents and than stop when the parent's is of the class Project (for loop?). How to do this? Is this the best way to go about it? BTW, I tried using switch-case (when @parent.class is Task, do this, when class is Project, do that), but seems hackish and I didn't manage it to work anyway.

4

2 回答 2

1

如果您owning_product在项目、任务、子任务上定义一个方法，使得

class Project
  def owning_project
    self
  end
end

class Task
  def owning_project
    project
  end
end

class Subtask
  def owning_project
    task.owning_project
  end
end

然后，您可以致电owning_project讨论的家长并取回相关项目。在某种程度上，这与您的 case 语句几乎相同，但使用继承系统为您进行切换。

于 2012-05-29T21:02:37.653 回答
1

如果你想让 switch-case 工作，它实际上必须打开@parent

case @parent
when Task
  ...
when Project
  ...
when Subtask
  ...
end
于 2012-05-29T17:28:31.687 回答