rspec error: undefined method...

gistfile1.txt

➜  myflix git:(mod0) ✗ rspec
..FFF

Failures:

  1) Video
     Failure/Error: it { should belongs_to(:category) }
     NoMethodError:
       undefined method `belongs_to' for #<RSpec::ExampleGroups::Video_2:0x000001068469d8>
     # ./spec/models/video_spec.rb:4:in `block (2 levels) in <top (required)>'

  2) Video
     Failure/Error: it { should validates_presence_of(:title) }
     NoMethodError:
       undefined method `validates_presence_of' for #<RSpec::ExampleGroups::Video_2:0x00000106857800>
     # ./spec/models/video_spec.rb:5:in `block (2 levels) in <top (required)>'

  3) Video
     Failure/Error: it { should validates_presence_of(:description) }
     NoMethodError:
       undefined method `validates_presence_of' for #<RSpec::ExampleGroups::Video_2:0x00000106856590>
     # ./spec/models/video_spec.rb:6:in `block (2 levels) in <top (required)>'

Finished in 0.03967 seconds (files took 1.99 seconds to load)
5 examples, 3 failures

Failed examples:

rspec ./spec/models/video_spec.rb:4 # Video
rspec ./spec/models/video_spec.rb:5 # Video
rspec ./spec/models/video_spec.rb:6 # Video