Base model requires the `databaase` method....

[jwoertink]

I'm finally getting around to upgrading to Avram 1.4.0 and after updating my base model to this:

abstract class BaseModel < Avram::Model
  def self.read_database : Avram::Database.class
    AppDatabase
  end

  def self.write_database : Avram::Database.class
    AppDatabase
  end

  macro default_columns
    primary_key id : UUID
    timestamps
  end
end

I get this error:

The class method `database` must be defined on CampaignAudienceStat, the BaseModel,
       or defined as separate `read_database` and `write_database` class methods.

       Example:
         def self.database : Avram::Database.class
           AppDatabase
         end

       Or separated as:
         def self.read_database : Avram::Database.class
           ReadDatabase
         end

         def self.write_database : Avram::Database.class
           WriteDatabase
         end (Exception)

My CampaignAudienceStat model looks like this:

class CampaignAudienceStat < BaseModel
  # TODO: figure out why this is needed
  skip_schema_enforcer
  view materialized: true do
    column user_id : UUID
    column username : String
    # some other columns
  end
end

I added the self.database method back in and now it's all happy... I just don't know why.