Add Log SQL Queries Executed By ActiveRecord as a rails til

rails/log-sql-queries-executed-by-activerecord.md

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+# Log SQL Queries Executed By ActiveRecord
+
+When entering ActiveRecord statements in a Rails console, it can be useful to
+see what SQL queries are being executed under the hood.
+
+```ruby
+> Book.first
+  Book Load (25.6ms)  SELECT  "books".* FROM "books" ORDER BY "books"."id" ASC LIMIT $1  [["LIMIT", 1]]
+=> #<Book:0x00007f824ec6ff98
+```
+
+Notice the line right after the statement shows the corresponding `select`
+query.
+
+If you aren't seeing this line of SQL, then you'll need to turn on logging for
+ActiveRecord. For instance, your test environment may not be configured to log
+the SQL.
+
+Right in your console, try running the following line:
+
+```ruby
+> ActiveRecord::Base.logger = Logger.new(STDOUT)
+```
+
+Enter an ActiveRecord statement, you should now be seeing the corresponding SQL
+queries.
+
+[source](https://stackoverflow.com/a/2936016/535590)