tini8 (tini8)

果然 V2EX 跟当年落伍者的运营方式如出一辙

tini8 — Sun, 22 Nov 2015 00:54:24 +0800

10 年前落伍者让我流连忘返，为什么？因为那里面总有一些同行讲故事给我听，并且讲的头头是道，让人听的上瘾，几天不去看看就觉得生活少了点什么似的。直到 10 年以后，我才逐渐发现那些讲故事的 ID 都是同一个人，因为文风太像了，讲的朦朦胧胧让人每看一篇都觉得人生有了收获，但其实什么收获都没有，如同心灵鸡汤，只不过比心灵鸡汤更接地气，因为那是站在自己的行业讲故事给自己听，又亲切又接地气，简直太爽了。当然收获嘛，除了荒废了大好的青春什么收获都没有。

今天我在 v2ex 又看到一篇第一人称的故事，当然这个故事是站在程序员的角度讲的，刚好我这段时间从站长转行为程序员，当年在落伍那种亲切又接地气的感觉又来了 http://www.v2ex.com/t/237958 。不过这次我学聪明了，毕竟被落伍荒废了近 10 年的青春还是有教训的，于是我在下面回复“跟当年的落伍者风格很像啊”，于是，我就被封 ID 了。

send_file 如果是图片的时候可不可以不下载直接在浏览器中显示？

tini8 — Sat, 05 Sep 2015 14:49:06 +0800

在 controller 中是这样的：

response.headers['Cache-Control'] = 'public, max-age=2592000'
response.headers['Content-type'] = 'image/jpeg'
send_file(
    filepath,
    :filename => @attachment.name,
    :type => @attachment.content_type
)

我希望在附件是图片的时候，打开这个网址，直接在浏览器中显示图片，而不是像其它文件一样直接下载下来

函数的返回值你用 return 吗？

tini8 — Mon, 10 Aug 2015 15:17:34 +0800

ruby 默认返回最后一行内容，但我还是习惯用 return 返回内容，不写总觉得怪怪的

递归文件夹是用 Find.find 还是 Dir.glob

tini8 — Mon, 27 Jul 2015 15:06:45 +0800

貌似 Dir.glob 很强大，可以用通配符过滤，不过既然有这么强大的为什么还有 Find.find 呢？

根据不同的域名，选择不同的 views 目录有没有捷径？

tini8 — Sat, 27 Jun 2015 13:30:15 +0800

因为要做手机站，访问 m.xxxx.com 的时候想使用手机版的模板，controller、models 手机版倒不用特殊定制了，就是 views 跟 PC 版不一样，有没有办法让访问 m.xxxx.com 的时候加载 views/m/ 文件夹下的模板？

guides.ruby-china.org 好卡啊，能不能把它也转回国内啊？

tini8 — Wed, 10 Jun 2015 15:49:48 +0800

看了下 IP 地址，澳大利亚的，http://guides.ruby-china.org/ 翻译的文档很好，比看英文文档快很多

真是用了 Ruby 就没法再用其他语言了

tini8 — Tue, 05 May 2015 10:46:58 +0800

太人性化了，发张小图骚情一下

用了 Ruby 以后，发现瓶颈已不在数据库，而在语言

tini8 — Mon, 27 Apr 2015 10:28:18 +0800

以 N 级菜单为例，在 php 下我是这样的：

`先用 "select * from trees" 查询出所有的菜单项，存入到一个数组，然后用一个递归函数循环这个数组，遇到 tree1.id == tree2.parent_id 的时候，把 tree2 保存到 tree1 的 children 里面。

这样只运行了一行 sql 查询，剩下的用程序算法实现。

在 ruby 下我也试着这样处理，结果速度慢的超乎我的想想，于是，在 ruby 下我只能这样做：

先用 "select * from trees where depth=1" 查询出所有的一级菜单项，然后

trees = trees.map do |tree|
  tree.children = Tree.where(parent_id: tree.id)
  tree.children = tree.children.map do |child|
    child.children = Tree.where(parent_id. child.id)
    child
  end
  tree
end

这样会进行好多次 sql 查询，但这样的速度是最快的，对 ruby 来说

================================= 2015-04-27 20:06 补充 ================================== PHP 递归实现菜单树的代码：

function make_tree($arr){
    if(!function_exists('make_tree1')){
        function make_tree1(&$arr, $parent_id=0){
            $new_arr = [];
            foreach($arr as $k=>$v){
                if($v->parent_id == $parent_id){
                    $new_arr[] = $v;
                    unset($arr[$k]);
                }
            }
            foreach($new_arr as &$a){
                $a->children = make_tree1($arr, $a->id);
            }
            return $new_arr;
        }
    }
    return make_tree1($arr);
}

中午吃饭的时候同事问"你是用驴逼的?"

tini8 — Thu, 16 Apr 2015 12:42:05 +0800

半天我没反应过来，想了半天感觉有点像 ruby，我确实是在公司写 ruby 的。真不知道他是故意的还是有意的

有用 Spree Commerce 的吗？真心慢啊

tini8 — Fri, 03 Apr 2015 22:07:18 +0800

在 MAC 上搭建了一个，每打开一个页面差不多得 2 秒钟，都花费再 erb 模板渲染上了，production 环境应该也改善不了多少吧，erb 模板没法缓存。

下面是打开首页时 console 的信息：

Started GET "/" for ::1 at 2015-04-03 21:59:17 +0800 Processing by Spree::HomeController#index as HTML Spree::Preference Load (0.1ms) SELECT "spree_preferences".* FROM "spree_preferences" WHERE "spree_preferences"."key" = ? LIMIT 1 [["key", "spree/frontend_configuration/locale"]] Spree::User Load (0.1ms) SELECT "spree_users".* FROM "spree_users" WHERE "spree_users"."deleted_at" IS NULL AND "spree_users"."id" = ? ORDER BY "spree_users"."id" ASC LIMIT 1 [["id", 1]] Spree::Store Load (0.1ms) SELECT "spree_stores".* FROM "spree_stores" WHERE (url like '%localhost%') ORDER BY "spree_stores"."id" ASC LIMIT 1 Spree::Store Load (0.1ms) SELECT "spree_stores".* FROM "spree_stores" WHERE "spree_stores"."default" = 't' ORDER BY "spree_stores"."id" ASC LIMIT 1 Spree::Order Load (0.0ms) SELECT "spree_orders".* FROM "spree_orders" WHERE "spree_orders"."completed_at" IS NULL AND "spree_orders"."currency" = ? AND "spree_orders"."guest_token" = ? AND "spree_orders"."store_id" = ? AND "spree_orders"."user_id" = ? LIMIT 1 [["currency", "USD"], ["guest_token", "Kw4AVot88W6Elx_pi9Tpkw"], ["store_id", 1], ["user_id", 1]] Spree::Order Load (0.1ms) SELECT "spree_orders".* FROM "spree_orders" WHERE "spree_orders"."user_id" = ? AND "spree_orders"."completed_at" IS NULL ORDER BY created_at DESC LIMIT 1 [["user_id", 1]] Spree::Taxonomy Load (0.1ms) SELECT "spree_taxonomies".* FROM "spree_taxonomies" ORDER BY spree_taxonomies.position, spree_taxonomies.created_at Spree::Taxon Load (0.2ms) SELECT "spree_taxons".* FROM "spree_taxons" WHERE "spree_taxons"."parent_id" IS NULL AND "spree_taxons"."taxonomy_id" IN (1, 2) Spree::Taxon Load (0.2ms) SELECT "spree_taxons".* FROM "spree_taxons" WHERE "spree_taxons"."parent_id" IN (1, 2) ORDER BY "lft" Rendered /Users/tini8/.rvm/gems/ruby-2.2.1@rails420/gems/spree_frontend-3.0.0/app/views/spree/shared/_taxonomies.html.erb (13.9ms) (0.3ms) SELECT COUNT(count_column) FROM (SELECT 1 AS count_column FROM "spree_products" INNER JOIN "spree_variants" ON "spree_variants"."product_id" = "spree_products"."id" AND "spree_variants"."is_master" = 't' AND "spree_variants"."deleted_at" IS NULL INNER JOIN "spree_prices" ON "spree_prices"."variant_id" = "spree_variants"."id" AND "spree_prices"."deleted_at" IS NULL WHERE "spree_products"."deleted_at" IS NULL AND ("spree_products".deleted_at IS NULL or "spree_products".deleted_at >= '2015-04-03 13:59:17.648583') AND ("spree_products".available_on <= '2015-04-03 13:59:17.649115') AND (spree_prices.amount IS NOT NULL) AND "spree_prices"."currency" = 'USD' LIMIT 12 OFFSET 0) subquery_for_count (0.2ms) SELECT MAX("spree_products"."updated_at") FROM "spree_products" INNER JOIN "spree_variants" ON "spree_variants"."product_id" = "spree_products"."id" AND "spree_variants"."is_master" = 't' AND "spree_variants"."deleted_at" IS NULL INNER JOIN "spree_prices" ON "spree_prices"."variant_id" = "spree_variants"."id" AND "spree_prices"."deleted_at" IS NULL WHERE "spree_products"."deleted_at" IS NULL AND ("spree_products".deleted_at IS NULL or "spree_products".deleted_at >= '2015-04-03 13:59:17.648583') AND ("spree_products".available_on <= '2015-04-03 13:59:17.649115') AND (spree_prices.amount IS NOT NULL) AND "spree_prices"."currency" = 'USD' LIMIT 12 OFFSET 0 (0.3ms) SELECT COUNT() FROM "spree_products" INNER JOIN "spree_variants" ON "spree_variants"."product_id" = "spree_products"."id" AND "spree_variants"."is_master" = 't' AND "spree_variants"."deleted_at" IS NULL INNER JOIN "spree_prices" ON "spree_prices"."variant_id" = "spree_variants"."id" AND "spree_prices"."deleted_at" IS NULL WHERE "spree_products"."deleted_at" IS NULL AND ("spree_products".deleted_at IS NULL or "spree_products".deleted_at >= '2015-04-03 13:59:17.648583') AND ("spree_products".available_on <= '2015-04-03 13:59:17.649115') AND (spree_prices.amount IS NOT NULL) AND "spree_prices"."currency" = 'USD' CACHE (0.0ms) SELECT COUNT(count_column) FROM (SELECT 1 AS count_column FROM "spree_products" INNER JOIN "spree_variants" ON "spree_variants"."product_id" = "spree_products"."id" AND "spree_variants"."is_master" = 't' AND "spree_variants"."deleted_at" IS NULL INNER JOIN "spree_prices" ON "spree_prices"."variant_id" = "spree_variants"."id" AND "spree_prices"."deleted_at" IS NULL WHERE "spree_products"."deleted_at" IS NULL AND ("spree_products".deleted_at IS NULL or "spree_products".deleted_at >= '2015-04-03 13:59:17.648583') AND ("spree_products".available_on <= '2015-04-03 13:59:17.649115') AND (spree_prices.amount IS NOT NULL) AND "spree_prices"."currency" = 'USD' LIMIT 12 OFFSET 0) subquery_for_count CACHE (0.0ms) SELECT COUNT(count_column) FROM (SELECT 1 AS count_column FROM "spree_products" INNER JOIN "spree_variants" ON "spree_variants"."product_id" = "spree_products"."id" AND "spree_variants"."is_master" = 't' AND "spree_variants"."deleted_at" IS NULL INNER JOIN "spree_prices" ON "spree_prices"."variant_id" = "spree_variants"."id" AND "spree_prices"."deleted_at" IS NULL WHERE "spree_products"."deleted_at" IS NULL AND ("spree_products".deleted_at IS NULL or "spree_products".deleted_at >= '2015-04-03 13:59:17.648583') AND ("spree_products".available_on <= '2015-04-03 13:59:17.649115') AND (spree_prices.amount IS NOT NULL) AND "spree_prices"."currency" = 'USD' LIMIT 12 OFFSET 0) subquery_for_count Spree::Product Load (0.3ms) SELECT "spree_products". FROM "spree_products" INNER JOIN "spree_variants" ON "spree_variants"."product_id" = "spree_products"."id" AND "spree_variants"."is_master" = 't' AND "spree_variants"."deleted_at" IS NULL INNER JOIN "spree_prices" ON "spree_prices"."variant_id" = "spree_variants"."id" AND "spree_prices"."deleted_at" IS NULL WHERE "spree_products"."deleted_at" IS NULL AND ("spree_products".deleted_at IS NULL or "spree_products".deleted_at >= '2015-04-03 13:59:17.648583') AND ("spree_products".available_on <= '2015-04-03 13:59:17.649115') AND (spree_prices.amount IS NOT NULL) AND "spree_prices"."currency" = 'USD' LIMIT 12 OFFSET 0 Spree::Variant Load (0.2ms) SELECT "spree_variants".* FROM "spree_variants" WHERE "spree_variants"."deleted_at" IS NULL AND "spree_variants"."is_master" = 't' AND "spree_variants"."product_id" IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) Spree::Price Load (0.2ms) SELECT "spree_prices".* FROM "spree_prices" WHERE "spree_prices"."deleted_at" IS NULL AND "spree_prices"."variant_id" IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) Spree::Image Load (0.3ms) SELECT "spree_assets".* FROM "spree_assets" WHERE "spree_assets"."type" IN ('Spree::Image') AND "spree_assets"."viewable_type" = 'Spree::Variant' AND "spree_assets"."viewable_id" IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) ORDER BY "spree_assets"."position" ASC Rendered /Users/tini8/.rvm/gems/ruby-2.2.1@rails420/gems/spree_frontend-3.0.0/app/views/spree/shared/_products.html.erb (447.9ms) Rendered /Users/tini8/.rvm/gems/ruby-2.2.1@rails420/gems/spree_frontend-3.0.0/app/views/spree/home/index.html.erb within spree/layouts/spree_application (622.9ms) Rendered /Users/tini8/.rvm/gems/ruby-2.2.1@rails420/gems/spree_frontend-3.0.0/app/views/spree/shared/_head.html.erb (189.1ms) Spree::Tracker Load (0.2ms) SELECT "spree_trackers".* FROM "spree_trackers" WHERE "spree_trackers"."active" = 't' ORDER BY "spree_trackers"."id" ASC LIMIT 1 Rendered /Users/tini8/.rvm/gems/ruby-2.2.1@rails420/gems/spree_frontend-3.0.0/app/views/spree/shared/_google_analytics.js.erb (1.1ms) Deface: 1 overrides found for 'spree/shared/_nav_bar' Deface: 'auth_shared_login_bar' matched 1 times with 'li#search-bar' Deface: [ERROR] The original source for 'auth_shared_login_bar' has changed, this override should be reviewed to ensure it's still valid. (0.2ms) SELECT MAX("spree_taxons"."updated_at") FROM "spree_taxons" WHERE "spree_taxons"."parent_id" IS NULL Spree::Taxon Load (0.1ms) SELECT "spree_taxons".* FROM "spree_taxons" WHERE "spree_taxons"."parent_id" IS NULL ORDER BY "spree_taxons"."lft" Rendered /Users/tini8/.rvm/gems/ruby-2.2.1@rails420/gems/spree_frontend-3.0.0/app/views/spree/shared/_search.html.erb (4.5ms) Rendered /Users/tini8/.rvm/gems/ruby-2.2.1@rails420/gems/spree_frontend-3.0.0/app/views/spree/shared/_nav_bar.html.erb (91.6ms) Rendered /Users/tini8/.rvm/gems/ruby-2.2.1@rails420/gems/spree_frontend-3.0.0/app/views/spree/shared/_main_nav_bar.html.erb (2.8ms) Rendered /Users/tini8/.rvm/gems/ruby-2.2.1@rails420/gems/spree_frontend-3.0.0/app/views/spree/shared/_header.html.erb (292.5ms) Rendered /Users/tini8/.rvm/gems/ruby-2.2.1@rails420/gems/spree_frontend-3.0.0/app/views/spree/shared/_sidebar.html.erb (0.2ms) Completed 200 OK in 1593ms (Views: 1582.2ms | ActiveRecord: 3.4ms)

rmbp 用了一下外接鼠标，被感动到了

tini8 — Tue, 24 Mar 2015 18:29:23 +0800

太 TM 好用了，还只是普通的杂牌鼠标。除了滚动不如触摸板平滑，其他点击操作啥的，比触摸板舒服多了。

Ruby 为什么没有 rbquery？Nokogiri 实在差强人意

tini8 — Sun, 15 Feb 2015 11:59:43 +0800

python 有个 pyquery，ruby 也应该有个 rbquery，nokogiri 用起来完全没有 jquery 的感觉啊。pyquery 能找到 80% 的 jquery 的感觉