undefined method `associative?' for nil:NilClass

Created by: dmc2015

• What were you trying to do? Render show page in administrate dashboard

• What did you end up with (logs, or, even better, example apps are great!)?

Showing /app_path/app/views/fields/has_many/_show.html.erb where line #21 raised:
undefined method `associative?' for nil:NilClass

I've check the associations between the model, dashboards and associated models and it looks right to me.

In the rails debugger the field looks like:

=> #<Administrate::Field::HasMany:0x00007fc3991eadc0 @attribute=:coates, @data=#<ActiveRecord::Associations::CollectionProxy [#<Coat id: 229, title: "brown jacket", description: ".".....
>>  

I am guessing there is an issue between coat and my dashboard model but it looks ok to me.

The error isn't very helpful.

• What versions are you running?
  • Rails
    • rails (>= 5.2.1)
  • administrate
    • administrate (0.14.0)