ShouldaMatchers validate_uniquess_of 作用域为多列

Question

I have a model with a unique index at the db level and model validation checking for uniqueness scoped to multiple columns.

# db level
add_index :table1, %i[fk_belongs_to_id col1 col2 col3 col4], unique: true

# model level
validates :fk_belongs_to_id, uniqueness: { scope: %i[col1 col2 col3 col4], case_sensitive: false }

In the spec I have:

it { should validate_uniqueness_of(:fk_belongs_to_id).scoped_to(%i[col1 col2 col3 col4).ignoring_case_sensitivity }

But I keep getting this error:

    NoMethodError:
       undefined method `all' for Symbol:Class

How can I test for uniqueness scope with multiple columns?

I am unable to find anything that can help with this in their docs or anything. Thanks for any help!

Answer 1

You solved your own problem, which is awesome, but just a quick note of explanation for future readers:

it { should... } (and the alternative it { is_expected.to... } ) translate under the covers to expect(subject).to... . So, both assume that prior to that the current context has defined subject .

The other thing to note is that, while RSpec continues to support both should and expect syntax, the general guidance is to stick with expect . In your case it doesn't matter as much since the should translates directly to expect , but in the more general usage expect solves a couple of problems with the older syntax. Check out this summary from RSpec about why.

Answer 2

It turned out being that I needed to define a subject in the spec. I had only seed the error that related to this as reflect_on_assocation .

So for clarification, I just added

subject { Model.new } and it worked:P