n_plus_one.txt

2.4.1 :001 > user = User.first
  User Load (0.9ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT $1  [["LIMIT", 1]]
 => #<User id: 1, name: "Gabriela", created_at: "2018-02-06 14:25:06", updated_at: "2018-02-06 14:25:06">
2.4.1 :002 > Address.create(street: "111 8th Ave", city: "New York", state: "NY", user: user)
   (0.2ms)  BEGIN
  SQL (1.9ms)  INSERT INTO "addresses" ("street", "city", "state", "user_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5, $6) RETURNING "id"  [["street", "111 8th Ave"], ["city", "New York"], ["state", "NY"], ["user_id", 1], ["created_at", "2018-02-06 14:28:51.050940"], ["updated_at", "2018-02-06 14:28:51.050940"]]
   (5.7ms)  COMMIT
 => #<Address id: 1, street: "111 8th Ave", city: "New York", state: "NY", zipcode: nil, user_id: 1, created_at: "2018-02-06 14:28:51", updated_at: "2018-02-06 14:28:51">
2.4.1 :003 > user
 => #<User id: 1, name: "Gabriela", created_at: "2018-02-06 14:25:06", updated_at: "2018-02-06 14:25:06">
2.4.1 :004 > user.addresses
  Address Load (0.4ms)  SELECT  "addresses".* FROM "addresses" WHERE "addresses"."user_id" = $1 LIMIT $2  [["user_id", 1], ["LIMIT", 11]]
 => #<ActiveRecord::Associations::CollectionProxy [#<Address id: 1, street: "111 8th Ave", city: "New York", state: "NY", zipcode: nil, user_id: 1, created_at: "2018-02-06 14:28:51", updated_at: "2018-02-06 14:28:51">]>
2.4.1 :005 > user.addresses
  Address Load (0.5ms)  SELECT  "addresses".* FROM "addresses" WHERE "addresses"."user_id" = $1 LIMIT $2  [["user_id", 1], ["LIMIT", 11]]
 => #<ActiveRecord::Associations::CollectionProxy [#<Address id: 1, street: "111 8th Ave", city: "New York", state: "NY", zipcode: nil, user_id: 1, created_at: "2018-02-06 14:28:51", updated_at: "2018-02-06 14:28:51">]>