Rails 4-对嵌套多态属性进行更新操作的多态关联

Question

I'm trying to figure out a problem I seem to keep having in setting up polymorphic associations in my Rails 4 app.

I have a project model and an address model. The associations are:

Profile

has_many :addresses, as: :addressable
    accepts_nested_attributes_for :addresses,  reject_if: :all_blank, allow_destroy: true

Address

belongs_to :addressable, :polymorphic => true

I previously asked this question on the same problem. I couldn't (and still can't) understand the answers in that post: Rails 4 - Polymorphic associations

This time around - I'm having a problem that is triggered when I try to update a profile by inserting an address. The error message identifies the problem as coming from the update action in the profiles controller. The update action has:

My profiles controller update action has:

def update

    # successful = @profile.update(profile_params)

    # Rails.logger.info "xxxxxxxxxxxxx"
    # Rails.logger.info successful.inspect
    # user=@profile.user
    # user.update.avatar
    # Rails.logger.info "prof xxxxxxxxxxxxx"
    # Rails.logger.info @profile.update(profile_params)
    respond_to do |format|
      if @profile.update(profile_params)
        format.html { redirect_to @profile }
        format.json { render :show, status: :ok, location: @profile }
      else
        format.html { render :edit }
        format.json { render json: @profile.errors, status: :unprocessable_entity }
      end
    end
  end

The error message says:

ERROR:  duplicate key value violates unique constraint "index_addresses_on_addressable_type_and_addressable_id"
DETAIL:  Key (addressable_type, addressable_id)=(Profile, 1) already exists.

Does anyone know what this message means, and how to address it?

Answer 1

In your database, you have set a unique constraint: , you can go to the database to see what you have set by the name of "index_addresses_on_addressable_type_and_addressable_id". As the error message show, you try to update a record with value ( Profile , 1) which has already been used by another record.
To solve this issue, there are two solutions: one is from the database side: you need to know why there is a unique constraint about addresses. if it is not need , you can remove it from the database. the other is ensure the (addressable_type, addressable_id) is unique before you update your data into database.

hope this can give a kind of help