Question

I am trying to seed my rails 3 app, and hitting a problem. My Category table has the following fields:

string “name”
integer “position”
integer “parent_id”

The parent_id is the id of another category, for nested_set.

Seeds.rb

Category.delete_all  
Category.create(:name => "Category 1",
              :position => 1,
              :parent_id => nil )

Category.create(:name => "Subcategory 1",
              :position => 1,
              :parent_id => 1 )

When I run

rake db:seed

I get the error:

rake aborted!
Couldn't find Category with id=1

Tasks: TOP => db:seed
(See full trace by running task with --trace)

So, how do I create the Category first so the ID 1 will be available?

Answer 1

The issue with your version is not that it isn’t being created in order, it’s that the autoincrement doesn’t reset so it isn’t given an ID of 1.

Try:

Category.delete_all
first_category = Category.create(:name => "Category 1",
          :position => 1,
          :parent_id => nil )
second_category = Category.create(:name => "Subcategory 1",
          :position => 1,
          :parent_id => first_category.id )