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timbeiko/gist:56a9bdcc6775d93825a4

Created April 3, 2015 02:06
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gistfile1.txt
[5] pry(#<PostsController>)> @post.update(post_params)
(0.1ms) begin transaction
Category Load (0.4ms) SELECT "categories".* FROM "categories" WHERE "categories"."id" IN (1, 2, 3)
Category Load (0.1ms) SELECT "categories".* FROM "categories" INNER JOIN "post_categories" ON "categories"."id" = "post_categories"."category_id" WHERE "post_categories"."post_id" = ? [["post_id", 1]]
SQL (0.4ms) INSERT INTO "post_categories" ("category_id", "post_id") VALUES (?, ?) [["category_id", 3], ["post_id", 1]]
(31.3ms) rollback transaction
NoMethodError: undefined method `name' for nil:NilClass
from /Users/tim/.rvm/gems/ruby-2.2.0/gems/activerecord-4.0.0/lib/active_record/associations/has_many_association.rb:80:in `cached_counter_attribute_name'
[6] pry(#<PostsController>)>
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