Rails Heroku - Resetting the database - ruby-on-rails

Question

I am trying to reset my database.
It isn't working locally or in heroku.
I succuessfully ran each of these commands:
1. rake db:drop
2. rake db:create
3. rake db:migrate
The migrations took a while to succeed. I commented out the ones that were causing a problem and the whole job finishes migrating.
I then try to reset my database with:
4. rake db:reset
I get this error:
initialize_schema_migrations_table()
-> 0.0031s
rake aborted!
NoMethodError: undefined method `name=' for #<University:0x007fc288bdcca0>
/app/vendor/bundle/ruby/2.2.0/gems/activemodel-4.1.9/lib/active_model/attribute_methods.rb:435:in `method_missing'
I can't find anywhere in the code base that has a method called 'name' for university. I have run searches looking for university.name and name near university.
I have updated my gems and run bundle install.
What does this error message mean?
When I try:
rake db:reset --trace
I get:
** Execute db:abort_if_pending_migrations
rake aborted!
NoMethodError: undefined method name=' for #<University:0x007f9a1b24da30>
/Users/em/.rvm/gems/ruby-2.2.2/gems/activemodel-4.1.9/lib/active_model/attribute_methods.rb:435:inmethod_missing'
I have run all migrations and refreshed rake db:migrate

Answer 1

This is the error you get when you are trying to write to a variable that you haven't declared an attr_writer for.
class Foo
attr_reader :bar
def initialize
#bar = 1
end
end
> f = foo.new
=> #<Foo:0xa22ef0c #bar=1>
> f.bar
=> 1
> f.bar = 2
NoMethodError: undefined method `bar=' for #<Foo:0xa22ef0c #bar=1>
from (irb):23
from /usr/local/rvm/rubies/ruby-2.1.3/bin/irb:11:in `<main>'

Answer 2

It looks like you've got something in your seeds.rb file causing the error.
The reason you're seeing the issue when running rake db:reset but not when running those 3 individual steps is because rake db:reset doesn't run those 3 individual steps.
rake db:reset will run the following:
rake db:drop
rake db:setup
and subsequently, rake db:setup will run these:
rake db:create
rake db:schema:load
rake db:seed
If you only want to do the initial 3 steps (rake db:drop, rake db:create, rake db:migrate), you can run this instead:
rake db:migrate:reset