Improve documentation around implicit attributes

[skip ci]

Closes #1017

GETTING_STARTED.md

@@ -541,6 +541,9 @@ factory :user do
 end
 ```
 
+Note that defining sequences as implicit attributes will not work if you have a
+factory with the same name as the sequence.
+
 And it's also possible to define an in-line sequence that is only used in
 a particular factory:
 
@@ -649,7 +652,7 @@ factory :story do
 end
 ```
 
-Traits can be used as attributes:
+Traits can be used as implicit attributes:
 
 ```ruby
 factory :week_long_published_story_with_title, parent: :story do
@@ -659,6 +662,9 @@ factory :week_long_published_story_with_title, parent: :story do
 end
 ```
 
+Note that defining traits as implicit attributes will not work if you have a
+factory or sequence with the same name as the trait.
+
 Traits that define the same attributes won't raise AttributeDefinitionErrors;
 the trait that defines the attribute latest gets precedence.
 

lib/factory_bot/definition_proxy.rb

@@ -56,17 +56,20 @@ module FactoryBot
     #
     # are equivalent.
     #
-    # If no argument or block is given, factory_bot will look for a sequence
-    # or association with the same name. This means that:
+    # If no argument or block is given, factory_bot will first look for an
+    # association, then for a sequence, and finally for a trait with the same
+    # name. This means that given an "admin" trait, an "email" sequence, and an
+    # "account" factory:
     #
-    #   factory :user do
-    #     email { create(:email) }
+    #   factory :user, traits: [:admin] do
+    #     email { generate(:email) }
     #     association :account
     #   end
     #
     # and:
     #
     #   factory :user do
+    #     admin
     #     email
     #     account
     #   end