Register inline sequence to allow for rewinding

This was originally opened as #1078, but this addresses the review
comments on that PR.

By registering the inline sequences, we allow them to get rewound with
`FactoryBot.rewind_sequences`. We register them with
`__#{factory_name}_#{sequence_name}__` to avoid conflicting with any
reasonably named global sequences, and to hint that we should not be
generating values from these sequences directly.

Co-authored-by: Damian Le Nouaille <dam@dln.name>
Co-authored-by: Damian Galarza <galarza.d@gmail.com>

lib/factory_bot/configuration.rb

@@ -11,7 +11,7 @@ module FactoryBot
       @traits         = Decorator::DisallowsDuplicatesRegistry.new(Registry.new('Trait'))
       @strategies     = Registry.new('Strategy')
       @callback_names = Set.new
-      @definition     = Definition.new
+      @definition     = Definition.new(:configuration)
 
       @allow_class_lookup = true
 

lib/factory_bot/definition.rb

@@ -1,9 +1,10 @@
 module FactoryBot
   # @api private
   class Definition
-    attr_reader :defined_traits, :declarations
+    attr_reader :defined_traits, :declarations, :name
 
-    def initialize(name = nil, base_traits = [])
+    def initialize(name, base_traits = [])
+      @name              = name
       @declarations      = DeclarationList.new(name)
       @callbacks         = []
       @defined_traits    = Set.new

lib/factory_bot/definition_proxy.rb

@@ -121,7 +121,9 @@ module FactoryBot
     #
     # Except that no globally available sequence will be defined.
     def sequence(name, *args, &block)
-      sequence = Sequence.new(name, *args, &block)
+      sequence_name = "__#{@definition.name}_#{name}__"
+      sequence = Sequence.new(sequence_name, *args, &block)
+      FactoryBot.register_sequence(sequence)
       add_attribute(name) { increment_sequence(sequence) }
     end
 

spec/acceptance/sequence_resetting_spec.rb

@@ -20,4 +20,80 @@ describe "FactoryBot.rewind_sequences" do
     expect(email).to eq "somebody1@example.com"
     expect(name).to eq "Joe"
   end
+
+  it "resets inline sequences back to their starting value" do
+    class User
+      attr_accessor :email
+    end
+
+    FactoryBot.define do
+      factory :user do
+        sequence(:email) { |n| "somebody#{n}@example.com" }
+      end
+    end
+
+    build_list(:user, 2)
+
+    FactoryBot.rewind_sequences
+
+    user = build(:user)
+
+    expect(user.email).to eq "somebody1@example.com"
+  end
+
+  it "does not collide with globally registered factories" do
+    class User
+      attr_accessor :email
+    end
+
+    FactoryBot.define do
+      sequence(:email) { |n| "global-somebody#{n}@example.com" }
+
+      factory :user do
+        sequence(:email) { |n| "local-somebody#{n}@example.com" }
+      end
+    end
+
+    2.times do
+      generate(:email)
+    end
+
+    build_list(:user, 2)
+
+    FactoryBot.rewind_sequences
+
+    user = build(:user)
+    email = generate(:email)
+
+    expect(user.email).to eq "local-somebody1@example.com"
+    expect(email).to eq "global-somebody1@example.com"
+  end
+
+  it "still allows global sequences prefixed with a factory name" do
+    class User
+      attr_accessor :email
+    end
+
+    FactoryBot.define do
+      sequence(:user_email) { |n| "global-somebody#{n}@example.com" }
+
+      factory :user do
+        sequence(:email) { |n| "local-somebody#{n}@example.com" }
+      end
+    end
+
+    2.times do
+      generate(:user_email)
+    end
+
+    build_list(:user, 2)
+
+    FactoryBot.rewind_sequences
+
+    user = build(:user)
+    email = generate(:user_email)
+
+    expect(user.email).to eq "local-somebody1@example.com"
+    expect(email).to eq "global-somebody1@example.com"
+  end
 end

spec/factory_bot/definition_proxy_spec.rb

@@ -1,5 +1,5 @@
 describe FactoryBot::DefinitionProxy, "#add_attribute" do
-  subject     { FactoryBot::Definition.new }
+  subject     { FactoryBot::Definition.new(:name) }
   let(:proxy) { FactoryBot::DefinitionProxy.new(subject) }
 
   it "raises if both a block and value are given" do
@@ -21,7 +21,7 @@ describe FactoryBot::DefinitionProxy, "#add_attribute" do
 end
 
 describe FactoryBot::DefinitionProxy, "#add_attribute when the proxy ignores attributes" do
-  subject     { FactoryBot::Definition.new }
+  subject     { FactoryBot::Definition.new(:name) }
   let(:proxy) { FactoryBot::DefinitionProxy.new(subject, true) }
 
   it "raises if both a block and value are given" do
@@ -43,7 +43,7 @@ describe FactoryBot::DefinitionProxy, "#add_attribute when the proxy ignores att
 end
 
 describe FactoryBot::DefinitionProxy, "#transient" do
-  subject     { FactoryBot::Definition.new }
+  subject     { FactoryBot::Definition.new(:name) }
   let(:proxy) { FactoryBot::DefinitionProxy.new(subject) }
 
   it "makes all attributes added ignored" do
@@ -56,7 +56,7 @@ describe FactoryBot::DefinitionProxy, "#transient" do
 end
 
 describe FactoryBot::DefinitionProxy, "#method_missing" do
-  subject     { FactoryBot::Definition.new }
+  subject     { FactoryBot::Definition.new(:name) }
   let(:proxy) { FactoryBot::DefinitionProxy.new(subject) }
 
   it "declares an implicit declaration without args or a block" do
@@ -82,30 +82,44 @@ describe FactoryBot::DefinitionProxy, "#method_missing" do
 end
 
 describe FactoryBot::DefinitionProxy, "#sequence" do
-  subject     { FactoryBot::Definition.new }
-  let(:proxy) { FactoryBot::DefinitionProxy.new(subject) }
 
-  before      { allow(FactoryBot::Sequence).to receive(:new) }
+  before do
+    allow(FactoryBot::Sequence).to receive(:new).and_call_original
+  end
+
+  def build_proxy(factory_name)
+    definition = FactoryBot::Definition.new(factory_name)
+    FactoryBot::DefinitionProxy.new(definition)
+  end
 
   it "creates a new sequence starting at 1" do
-    proxy.sequence(:great)
-    expect(FactoryBot::Sequence).to have_received(:new).with(:great)
+    proxy = build_proxy(:factory)
+    proxy.sequence(:sequence)
+
+    expect(FactoryBot::Sequence).to have_received(:new).
+      with("__factory_sequence__")
   end
 
   it "creates a new sequence with an overridden starting vaue" do
-    proxy.sequence(:great, "C")
-    expect(FactoryBot::Sequence).to have_received(:new).with(:great, "C")
+    proxy = build_proxy(:factory)
+    proxy.sequence(:sequence, "C")
+
+    expect(FactoryBot::Sequence).to have_received(:new).
+      with("__factory_sequence__", "C")
   end
 
   it "creates a new sequence with a block" do
     sequence_block = Proc.new { |n| "user+#{n}@example.com" }
-    proxy.sequence(:great, 1, &sequence_block)
-    expect(FactoryBot::Sequence).to have_received(:new).with(:great, 1, &sequence_block)
+    proxy = build_proxy(:factory)
+    proxy.sequence(:sequence, 1, &sequence_block)
+
+    expect(FactoryBot::Sequence).to have_received(:new).
+      with("__factory_sequence__", 1, &sequence_block)
   end
 end
 
 describe FactoryBot::DefinitionProxy, "#association" do
-  subject     { FactoryBot::Definition.new }
+  subject     { FactoryBot::Definition.new(:name) }
   let(:proxy) { FactoryBot::DefinitionProxy.new(subject) }
 
   it "declares an association" do
@@ -120,7 +134,7 @@ describe FactoryBot::DefinitionProxy, "#association" do
 end
 
 describe FactoryBot::DefinitionProxy, "adding callbacks" do
-  subject        { FactoryBot::Definition.new }
+  subject        { FactoryBot::Definition.new(:name) }
   let(:proxy)    { FactoryBot::DefinitionProxy.new(subject) }
   let(:callback) { -> { "my awesome callback!" } }
 
@@ -159,7 +173,7 @@ describe FactoryBot::DefinitionProxy, "adding callbacks" do
 end
 
 describe FactoryBot::DefinitionProxy, "#to_create" do
-  subject     { FactoryBot::Definition.new }
+  subject     { FactoryBot::Definition.new(:name) }
   let(:proxy) { FactoryBot::DefinitionProxy.new(subject) }
 
   it "accepts a block to run in place of #save!" do
@@ -170,7 +184,7 @@ describe FactoryBot::DefinitionProxy, "#to_create" do
 end
 
 describe FactoryBot::DefinitionProxy, "#factory" do
-  subject     { FactoryBot::Definition.new }
+  subject     { FactoryBot::Definition.new(:name) }
   let(:proxy) { FactoryBot::DefinitionProxy.new(subject) }
 
   it "without options" do
@@ -191,7 +205,7 @@ describe FactoryBot::DefinitionProxy, "#factory" do
 end
 
 describe FactoryBot::DefinitionProxy, "#trait" do
-  subject     { FactoryBot::Definition.new }
+  subject     { FactoryBot::Definition.new(:name) }
   let(:proxy) { FactoryBot::DefinitionProxy.new(subject) }
 
   it "declares a trait" do
@@ -202,7 +216,7 @@ describe FactoryBot::DefinitionProxy, "#trait" do
 end
 
 describe FactoryBot::DefinitionProxy, "#initialize_with" do
-  subject     { FactoryBot::Definition.new }
+  subject     { FactoryBot::Definition.new(:name) }
   let(:proxy) { FactoryBot::DefinitionProxy.new(subject) }
 
   it "defines the constructor on the definition" do

spec/factory_bot/definition_spec.rb

@@ -1,64 +1,75 @@
 describe FactoryBot::Definition do
+  subject { described_class.new(:name) }
+
   it { should delegate(:declare_attribute).to(:declarations) }
-end
 
-describe FactoryBot::Definition, "with a name" do
-  let(:name) { :"great name" }
-  subject    { FactoryBot::Definition.new(name) }
+  describe "with a name" do
+    it "creates a new attribute list with the name passed" do
+      name = "great name"
+      allow(FactoryBot::DeclarationList).to receive(:new)
 
-  it "creates a new attribute list with the name passed" do
-    allow(FactoryBot::DeclarationList).to receive(:new)
-    subject
-    expect(FactoryBot::DeclarationList).to have_received(:new).with(name)
-  end
-end
-
-describe FactoryBot::Definition, "#overridable" do
-  let(:list) { double("declaration list", overridable: true) }
-  before do
-    allow(FactoryBot::DeclarationList).to receive(:new).and_return list
-  end
-
-  it "sets the declaration list as overridable" do
-    expect(subject.overridable).to eq subject
-    expect(list).to have_received(:overridable).once
-  end
-end
-
-describe FactoryBot::Definition, "defining traits" do
-  let(:trait_1) { double("trait") }
-  let(:trait_2) { double("trait") }
-
-  it "maintains a list of traits" do
-    subject.define_trait(trait_1)
-    subject.define_trait(trait_2)
-    expect(subject.defined_traits).to include(trait_1, trait_2)
-  end
-
-  it "adds only unique traits" do
-    subject.define_trait(trait_1)
-    subject.define_trait(trait_1)
-    expect(subject.defined_traits.size).to eq 1
-  end
-end
-
-describe FactoryBot::Definition, "adding callbacks" do
-  let(:callback_1) { "callback1" }
-  let(:callback_2) { "callback2" }
-
-  it "maintains a list of callbacks" do
-    subject.add_callback(callback_1)
-    subject.add_callback(callback_2)
-    expect(subject.callbacks).to eq [callback_1, callback_2]
-  end
-end
-
-describe FactoryBot::Definition, "#to_create" do
-  its(:to_create) { should be_nil }
-
-  it "returns the assigned value when given a block" do
-    block = proc { nil }
-    subject.to_create(&block)
-    expect(subject.to_create).to eq block
+      FactoryBot::Definition.new(name)
+
+      expect(FactoryBot::DeclarationList).to have_received(:new).with(name)
+    end
+  end
+
+  describe "#name" do
+    it "returns the name" do
+      name = "factory name"
+      definition = described_class.new(name)
+
+      expect(definition.name).to eq(name)
+    end
+  end
+
+  describe "#overridable" do
+    let(:list) { double("declaration list", overridable: true) }
+    before do
+      allow(FactoryBot::DeclarationList).to receive(:new).and_return list
+    end
+
+    it "sets the declaration list as overridable" do
+      expect(subject.overridable).to eq subject
+      expect(list).to have_received(:overridable).once
+    end
+  end
+
+  describe "defining traits" do
+    let(:trait_1) { double("trait") }
+    let(:trait_2) { double("trait") }
+
+    it "maintains a list of traits" do
+      subject.define_trait(trait_1)
+      subject.define_trait(trait_2)
+      expect(subject.defined_traits).to include(trait_1, trait_2)
+    end
+
+    it "adds only unique traits" do
+      subject.define_trait(trait_1)
+      subject.define_trait(trait_1)
+      expect(subject.defined_traits.size).to eq 1
+    end
+  end
+
+  describe "adding callbacks" do
+    let(:callback_1) { "callback1" }
+    let(:callback_2) { "callback2" }
+
+    it "maintains a list of callbacks" do
+      subject.add_callback(callback_1)
+      subject.add_callback(callback_2)
+      expect(subject.callbacks).to eq [callback_1, callback_2]
+    end
+  end
+
+  describe "#to_create" do
+    its(:to_create) { should be_nil }
+
+    it "returns the assigned value when given a block" do
+      block = proc { nil }
+      subject.to_create(&block)
+      expect(subject.to_create).to eq block
+    end
   end
 end