Add Specify New Attributes For #find_or_create_by as a Rails til

Author: jbranchaud

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://tinyletter.com/jbranchaud).
 
-_1046 TILs and counting..._
+_1047 TILs and counting..._
 
 ---
 
@@ -690,6 +690,7 @@ _1046 TILs and counting..._
 - [Show Rails Models With Pry](rails/show-rails-models-with-pry.md)
 - [Show Rails Routes With Pry](rails/show-rails-routes-with-pry.md)
 - [Skip Validations When Creating A Record](rails/skip-validations-when-creating-a-record.md)
+- [Specify New Attributes For #find_or_create_by](rails/specify-new-attributes-for-find-or-create-by.md)
 - [Temporarily Disable strong_params](rails/temporarily-disable-strong-params.md)
 - [Test If An Instance Variable Was Assigned](rails/test-if-an-instance-variable-was-assigned.md)
 - [Truncate Almost All Tables](rails/truncate-almost-all-tables.md)

rails/specify-new-attributes-for-find-or-create-by.md

@@ -0,0 +1,37 @@
+# Specify New Attributes For #find_or_create_by
+
+The ActiveRecord
+[`#find_or_create_by`](https://apidock.com/rails/v4.0.2/ActiveRecord/Relation/find_or_create_by)
+method is a handy way to get an object that represents a record. It will
+attempt to look up that record, usually based on a unique value or set of
+values. If it can find one, then that's the record you get. If nothing is
+found, then it will create a new record.
+
+New records tend to need more data than just the unique lookup attribute. There
+are a couple ways these other attributes can be specified.
+
+The first is by giving `#find_or_create_by` a block.
+
+```ruby
+User.find_or_create_by(email: "some@email.com") do |new_user|
+  new_user.admin = false
+  new_user.password = params[:password]
+  new_user.password_confirm = params[:password_confirm]
+end
+```
+
+Another approach is to precede the `#find_or_create_by` call with a
+[`#create_with`](https://apidock.com/rails/ActiveRecord/QueryMethods/create_with)
+call.
+
+
+```ruby
+User.create_with(
+  admin: false,
+  password: params[:password],
+  password_confirm: params[:password_confirm]
+).find_or_create_by(email: "some@email.com")
+```
+
+In both cases, the extra attributes will not be applied to the `User` record in
+the case of a _find_; they are only used in the case of a _create_.