Remove deprecated factory lookup by class (#1212)

Closes #1196

We deprecated looking up factories by class in #877. We introduced
`allow_class_lookup` option so that people could disable the behavior
entirely after fixing the deprecation warning.

In preparation for factory_bot 5, I am removing the deprecation warning
and the `allow_class_lookup` option. It is no longer possible to look
up factories by class. This has also made the ClassKeyHash decorator
unnecessary. The behavior is technically a little different now
that we are using HashWithIndifferentAccess
instead of calling to_sym on the key, but it
should behave identically for any standard,
documented factory_bot usage.

lib/factory_bot.rb

@@ -39,7 +39,6 @@ require "factory_bot/find_definitions"
 require "factory_bot/reload"
 require "factory_bot/decorator"
 require "factory_bot/decorator/attribute_hash"
-require "factory_bot/decorator/class_key_hash"
 require "factory_bot/decorator/disallows_duplicates_registry"
 require "factory_bot/decorator/invocation_tracker"
 require "factory_bot/decorator/new_constructor"
@@ -80,8 +79,6 @@ module FactoryBot
              :skip_create,
              :initialize_with,
              :constructor,
-             :allow_class_lookup,
-             :allow_class_lookup=,
              :use_parent_strategy,
              :use_parent_strategy=,
              to: :configuration

lib/factory_bot/configuration.rb

@@ -3,7 +3,7 @@ module FactoryBot
   class Configuration
     attr_reader :factories, :sequences, :traits, :strategies, :callback_names
 
-    attr_accessor :allow_class_lookup, :use_parent_strategy
+    attr_accessor :use_parent_strategy
 
     def initialize
       @factories      = Decorator::DisallowsDuplicatesRegistry.new(Registry.new("Factory"))
@@ -13,8 +13,6 @@ module FactoryBot
       @callback_names = Set.new
       @definition     = Definition.new(:configuration)
 
-      @allow_class_lookup = true
-
       to_create(&:save!)
       initialize_with { new }
     end

lib/factory_bot/decorator/class_key_hash.rb

@@ -1,28 +0,0 @@
-module FactoryBot
-  class Decorator
-    class ClassKeyHash < Decorator
-      def [](key)
-        @component[symbolized_key key]
-      end
-
-      def []=(key, value)
-        @component[symbolized_key key] = value
-      end
-
-      def key?(key)
-        @component.key? symbolized_key(key)
-      end
-
-      private
-
-      def symbolized_key(key)
-        if key.respond_to?(:to_sym)
-          key.to_sym
-        elsif FactoryBot.allow_class_lookup
-          ActiveSupport::Deprecation.warn "Looking up factories by class is deprecated and will be removed in 5.0. Use symbols instead and set FactoryBot.allow_class_lookup = false", caller
-          key.to_s.underscore.to_sym
-        end
-      end
-    end
-  end
-end

lib/factory_bot/registry.rb

@@ -1,3 +1,5 @@
+require "active_support/core_ext/hash/indifferent_access"
+
 module FactoryBot
   class Registry
     include Enumerable
@@ -6,7 +8,7 @@ module FactoryBot
 
     def initialize(name)
       @name  = name
-      @items = Decorator::ClassKeyHash.new({})
+      @items = ActiveSupport::HashWithIndifferentAccess.new
     end
 
     def clear

spec/acceptance/keyed_by_class_spec.rb

@@ -5,27 +5,13 @@ describe "finding factories keyed by class instead of symbol" do
     end
 
     FactoryBot.define do
-      factory :user do
-        name { "John Doe" }
-        sequence(:email) { |n| "person#{n}@example.com" }
-      end
+      factory :user
     end
   end
 
-  context "when deprecated class lookup if allowed", :silence_deprecation do
-    it "allows interaction based on class name" do
-      user = FactoryBot.create User, email: "person@example.com"
-      expect(user.email).to eq "person@example.com"
-      expect(user.name).to eq "John Doe"
-    end
-  end
-
-  context "when class lookup is disallowed" do
-    it "doesn't find the factory" do
-      FactoryBot.allow_class_lookup = false
-      expect { FactoryBot.create(User) }.to(
-        raise_error(ArgumentError, "Factory not registered: User"),
-      )
-    end
+  it "doesn't find the factory" do
+    expect { FactoryBot.create(User) }.to(
+      raise_error(ArgumentError, "Factory not registered: User"),
+    )
   end
 end