Rails duplicate multiple records at once and changing certain attributes-CodePudding

I am looking to duplicate multiple records from a table Book, and modify certain attributes at the same time, such as giving a new user_id and a new library_id. I have put the following together

@new_data = Book.where(library_id: "xxxxxx").dup.tap { |ele| ele.assign_attributes(user_id: @new_user_id, library_id:  @new_library_id) }.save

But i have an error :

NoMethodError (undefined method `assign_attributes' for #<Book::ActiveRecord_Relation:0x000055bed16fd5c0>)

Is there a way to do this please ?

CodePudding user response：

You could do it like this:

      @new_data = []
      Book.where(library_id: 'xxxxxx').each do |book|
        new_book = book.dup
        new_book.assign_attributes(user_id: @new_user_id, library_id:  @new_library_id)
        new_book.save
        @new_data << new_book
      end

Note: Rails convention dictates that Books should be singular. I've adjusted it to Book in this code.