- Rails에서는 ActiveRecord를 활용한다.
$ rails g controller post index new create show edit update destroy$ rails g model postapp/model/post.rbdb/migrate/20180619_create_posts.rbmigration 파일변경
# db/migrate/migrate/20180619_create_posts.rb
class CreatePosts < ActiveRecord::Migration
def change
create_table :posts do |t|
t.string :title
t.text :body
t.timestamps null: false
end
end
end$rake db:migrate
#진짜 table을 만든다
== 20180619043119 CreatePosts: migrating ======================================
-- create_table(:posts)
-> 0.0089s
== 20180619043119 CreatePosts: migrated (0.0098s) =============================
db/schema.rb에 반영이 되었는지 확인
-
Create :
new,create -
Read :
show -
Update :
edit,update -
Destroy :
destroy -
Create
irb(main):001:0 > Post.create(title: "제목", body: "내용")
(0.1ms) begin transaction
SQL (5.3ms) INSERT INTO "posts" ("title", "body", "created_at", "updated_at") VALUES (?, ?, ?, ?) [["title", "제목"], ["body", "내용"], ["created_at", "2018-06-19 08:29:59.313013"], ["updated_at", "2018-06-19 08:29:59.313013"]]
(3.9ms) commit transaction
=> #<Post id: 1, title: "제목", body: "내용", created_at: "2018-06-19 08:29:59", updated_at: "2018-06-19 08:29:59">
- Read
irb(main):001:0 > Post.find(id)
(0.1ms) begin transaction
SQL (5.3ms) INSERT INTO "posts" ("title", "body", "created_at", "updated_at") VALUES (?, ?, ?, ?) [["title", "제목"], ["body", "내용"], ["created_at", "2018-06-19 08:29:59.313013"], ["updated_at", "2018-06-19 08:29:59.313013"]]
(3.9ms) commit transaction
=> #<Post id: 1, title: "제목", body: "내용", created_at: "2018-06-19 08:29:59", updated_at: "2018-06-19 08:29:59">
irb(main):002:0> Post.find(1)
Post Load (1.9ms) SELECT "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT 1 [["id", 1]]
=> #<Post id: 1, title: "제목", body: "내용", created_at: "2018-06-19 08:29:59", updated_at: "2018-06-19 08:29:59">
- update
irb(main):001:0 > post = Post.find(id)
irb(main):002:0 > post.update(title: "변경", body: "변경")
irb(main):003:0> Post.find(1).update(title: "변경", body: " 변경")
Post Load (1.8ms) SELECT "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT 1 [["id", 1]]
(0.1ms) begin transaction
SQL (8.1ms) UPDATE "posts" SET "title" = ?, "body" = ?, "updated_at" = ? WHERE "posts"."id" = ? [["title", "변경"], ["body", "변경"], ["updated_at", "2018-06-19 08:31:14.239322"], ["id", 1]]
(5.7ms) commit transaction
=> true- Destroy
irb(main):001:0 > Post.find(id).destroy
Post Load (1.9ms) SELECT "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT 1 [["id", 1]]
(0.1ms) begin transaction
SQL (6.5ms) DELETE FROM "posts" WHERE "posts"."id" = ? [["id", 1]]
(5.6ms) commit transaction
=> #<Post id: 1, title: "변경", body: "변경", created_at: "2018-06-19 08:29:59", updated_at: "2018-06-19 08:31:14">def destroy
flash[:alert] = "삭제되었습니다."
end<%= flash[:alert]%>app/views/layout/_flash.html.erb
<%= render 'layout/flash'%>
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