RSpec: Flush table / destroy objects after each context - ruby-on-rails

Question

How do you delete the objects (in the database and in the memory) you created
after each test
AND after each context? (in a context it could make sense to build tests on each other)
Is there a method to do this automatically?
I have the following problem:
Each test saves entries to the database. The next test then depends on these entries. Even if I wanted to build tests that are dependent on other tests, I couldn't, because the order in which the tests get executed is not controllable.
factories.rb:
sequence(:name) { |n| "purchaser #{n}" }
organization_spec.rb:
context "when no supplier exists" do
it "finds no associated suppliers" do
purchaser = create(:organization_purchaser)
purchaser.partners.empty?.should == true
end
end
context "when one supplier exists" do
it "finds one associated suppliers" do
purchaser = create(:organization_purchaser)
supplier = create(:organization_supplier)
partnership = create(:partnership, organization: purchaser, partner: supplier)
purchaser.partners.last.name.should == "purchaser 1"
end
end
context "when two suppliers exist" do
it "finds two associated suppliers" do
purchaser = create(:organization_purchaser)
2.times do |i|
supplier = create(:organization_supplier)
partnership = create(:partnership, organization: purchaser, partner: supplier)
end
purchaser.partners.last.name.should == "purchaser 2"
end
end
RSpec output:
Organization
#suppliers_for_purchaser
responds
when no supplier exists
finds no associated suppliers
when two suppliers exist
finds two associated suppliers
when one supplier exists
finds one associated suppliers (FAILED - 1)
Failures:
1) Organization#suppliers_for_purchaser when one supplier exists finds one associated suppliers
Failure/Error: purchaser.partners.last.name.should == "purchaser 1"
expected: "purchaser 1"
got: "purchaser 3" (using ==)

Answer 1

You should use Database Cleaner
All you have to do is add the following code to your Rspec configuration file spec_helper.rb
config.before(:suite) do
DatabaseCleaner.strategy = :transaction
DatabaseCleaner.clean_with(:truncation)
end
config.before(:each) do
DatabaseCleaner.start
end
config.after(:each) do
DatabaseCleaner.clean
end
UPDATE
As of Rails 5.1 this is not needed if you use config.use_transactional_tests
https://github.com/rails/rails/pull/19282

Answer 2

Did you try adding a before method ?
describe MyController do
before(:each) do
User.delete_all
MyOtherModel.delete_all
...
end

Answer 3

I think your question is more along the lines of how can I reset a factory girl sequence? Those arent stored in the database, even if you delete all you will still have the issue. When testing something like this I find it easer to just override the factory girl sequence..
it "finds one associated suppliers" do
purchaser = create(:organization_purchaser)
supplier = create(:organization_supplier , name: "My First Supplier")
partnership = create(:partnership, organization: purchaser, partner: supplier)
purchaser.partners.last.name.should == "My First Supplier"
end
The other things you probably do is something like
it "finds one associated suppliers" do
purchaser = create(:organization_purchaser)
supplier = create(:organization_supplier)
partnership = create(:partnership, organization: purchaser, partner: supplier)
purchaser.partners.last.should == supplier
end
or even
it "finds one associated suppliers" do
purchaser = create(:organization_purchaser)
supplier = create(:organization_supplier)
partnership = create(:partnership, organization: purchaser, partner: supplier)
purchaser.partners.last.name.should == supplier.name
end