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PORails 4 accessing model attribute
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  1. PORails 4 accessing model attribute
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    copied!<p>I'm learning rails (I'm mostly a java developer), as will be obvious by my question, and am having trouble accessing a method on my model from my rspec test. I'm basically following <a href="http://ruby.railstutorial.org/book/ruby-on-rails-tutorial" rel="nofollow">this tutorial</a> but applying it to my own project. I'm trying to define graduation_year as a method based on the grade of the student and the current time of the year. When I instantiate the object and call the method in rails console it works as I'd expect, but when trying to do it in a test I'm getting:</p> <pre><code>undefined method `graduation_year' </code></pre> <h2>student.rb</h2> <pre><code>class Student &lt; ActiveRecord::Base validates :school_id, presence: true, uniqueness: true validates :first_name, presence: true, length: { maximum: 30 } validates :last_name, presence: true, length: { maximum: 40 } validates :gender, presence: true, inclusion: { :in =&gt; %w(m f M F) } validates :grade, presence: true, numericality: { greater_than_or_equal_to: 1 , less_than_or_equal_to: 12 } def graduation_year year = Date.today.year + ( 12 - grade ) end end </code></pre> <h2>student_spec.rb</h2> <pre><code>require 'spec_helper' describe Student do before { @student = Student.new( school_id: 3, first_name: "Michael", last_name: "Green", gender: "M", grade: 6)} subject { @student } it { should respond_to(:school_id) } it { should respond_to(:first_name) } it { should respond_to(:last_name) } it { should respond_to(:gender) } it { should respond_to(:grade) } it { should respond_to(:graduation_year) } it { should be_valid } describe "when school_id is not present" do before { @student.school_id = " " } it { should_not be_valid } end . . . describe "when grade is 7 graduation_year should be calculated correctly" do before { @student.grade = 7 } expect(@student.graduation_year).to eq(Date.today.year+5) end end </code></pre> <h2>Error message</h2> <pre><code>~/dev/rails_apps/spec/models/student_spec.rb:96:in `block (2 levels) in &lt;top (required)&gt;': undefined method `graduation_year' for nil:NilClass (NoMethodError) from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:242:in `module_eval' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:242:in `subclass' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:228:in `describe' from ~/dev/rails_apps/spec/models/student_spec.rb:94:in `block in &lt;top (required)&gt;' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:242:in `module_eval' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:242:in `subclass' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:228:in `describe' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/dsl.rb:18:in `describe' from ~/dev/rails_apps/spec/models/student_spec.rb:3:in `&lt;top (required)&gt;' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `load' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `block in load_spec_files' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `each' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `load_spec_files' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/command_line.rb:22:in `run' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:80:in `run' from ~/dev/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:17:in `block in autorun' </code></pre> <p>Also, I don't think this is the issue, but I originally had the <code>graduation_year</code> as an attribute on the Student table, but removed it and this test is supposed to verify that it is calculated correctly.</p> <p>I've also tried <code>puts first_name</code> in the tests and I get the same undefined method error but on <code>first_name</code>. I think I'm just missing something about the way ruby/rails works.</p>
 

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