CODEWITHSUNDEEP
ruby-on-railsrubyactiverecordrspecreadonly
softcode
softcode

Reputation: 4658

RSpec attr_readonly

I have a product that has a readonly attribute called rfid

class Product < ActiveRecord::Base
  attr_readonly :rfid

I have the following spec to check that it is, indeed, readonly

describe Product do
  before :each do
    @product = FactoryGirl.create(:product)
  end
  it "'s rfid is immutable'" do
    @product.update_attribute(:rfid, 1921)
    @product.valid?
    expect(@product.errors[:rfid]).to include("marked as readonly")
  end

But it fails and returns:

  1) Product 's rfid is immutable'
     Failure/Error: @product.update_attribute(:rfid, 1921)
     ActiveRecord::ActiveRecordError:
       rfid is marked as readonly

I tried with "has already been taken" and expect(@product.rfid).to eq(1921) and to have(1).errors etc. to no avail

As usual, any help greatly appreciated

Upvotes: 0

Views: 1185

Answers (1)

infused
infused

Reputation: 24337

Trying to update a read only attribute will raise an ActiveRecord::ActiveRecordError erorr, rather than add a validation error to the model. You can test that the error is raised with:

expect {
  @product.update_attribute(:rfid, 1921)
}.to raise_error(ActiveRecord::ActiveRecordError, 'rfid is marked as readonly')

Upvotes: 3

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