更改模型回调的params值

Question

所以我有三个模型group、recipient和group_recipients。

class Group < ApplicationRecord
    has_many :group_recipients, dependent: :destroy
    has_many :recipients, through: :group_recipients
end
class GroupRecipient < ApplicationRecord
    belongs_to :recipient, inverse_of: :group_recipients, autosave: true
    belongs_to :group
end
class Recipient < ApplicationRecord
    has_many :group_recipients, inverse_of: :recipient, autosave: true, dependent: :destroy
    has_many :groups, through: :group_recipients
end

控制器#更新recipients_controller.rb

def update
 @recipient = Recipient.with_deleted.find(params[:id])
 if @recipient.update(recipient_params)
  respond_to do |format|
    redirect_url = params[:commit] == 'Save and add another' ? new_recipient_path : edit_recipient_path(@recipient)
    format.html { redirect_to redirect_url, notice: 'Recipient was successfully updated.' }
    format.json { render json: {status: :success} }
  end
else
  respond_to do |format|
    format.html { render :edit }
    format.json do
      render json: {
        status: :error,
        recipient: @recipient,
        errors: @recipient.errors
      }
    end
  end
end
end
 def recipient_params
   params.require(:recipient).permit(
   :email_address, :first_name, :last_name, :language_id,
   :phone, group_ids: [])
 end

在接收方update上，接收params[:group_ids]。在这里，在before_update回调中，我希望能够用一些逻辑更改group_ids的值。我可能需要添加或删除group_ids数组中的数据。

问题是，即使我更改了activerecord，它也会根据params[:group_ids]更新所有组。在回调之前或之后使用它都无关紧要。一旦我在self.group_ids中设置了值，它就会进行这些更改，但一旦事务完成，它就会再次恢复这些更改。

Answer 1

在回调before_update中进行更新的想法不好，您会遇到递归错误的问题。另一种方法是根据控制器中的逻辑更改参数，然后可以使用正常的更新方法。