我在rails 5的敏捷Web开发教程中的一些代码中使用number_to_currency方法。我收到以下错误：
TypeError in Store#index
Showing C:/Sites/depot/app/views/store/index.html.erb where line #13 raised:
no implicit conversion of String into Hash
Extracted source (around line #13):
<%= sanitize(product.description) %>
<div class="price_line">
<span class="price"><%= number_to_currency(product.price) %></span>
<%= button_to t('.add_html'),
line_items_path(product_id: product, locale: I18n.locale),
remote: true %>
我理解错误的方式是number_to_currency方法需要一个数字并且正在获取一个字符串。我检查了迁移文件，product.price应该是小数。在rails控制台Product.first.price.class中提供类BigDecimal。而不是错误暗示的字符串。哈希在哪里发挥作用。为什么要尝试将字符串转换为哈希值。我不明白该方法中发生了什么。任何人都可以向我解释这个吗？
index.html.erb：
<p id="notice"><%= notice %></p>
<h1><%= t('.title_html') %></h1>
<% cache @products do %>
<% @products.each do |product| %>
<% cache product do %>
<div class="entry">
<%= image_tag(product.image_url) %>
<h3><%= product.title %></h3>
<%= sanitize(product.description) %>
<div class="price_line">
<span class="price"><%= number_to_currency(product.price) %></span>
<%= button_to t('.add_html'),
line_items_path(product_id: product, locale: I18n.locale),
remote: true %>
</div>
</div>
<% end %>
<% end %>
<% end %>
从schema.rb
中摘录 create_table "products", force: :cascade do |t|
t.string "title"
t.text "description"
t.string "image_url"
t.decimal "price"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
相关的日志条目：
=> Booting Puma
=> Rails 5.0.6 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
*** SIGUSR2 not implemented, signal based restart unavailable!
*** SIGUSR1 not implemented, signal based restart unavailable!
*** SIGHUP not implemented, signal based logs reopening unavailable!
Puma starting in single mode...
* Version 3.11.2 (ruby 2.2.6-p396), codename: Love Song
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop
Started GET "/cable" for 127.0.0.1 at 2018-03-30 14:06:21 +0100
ActiveRecord::SchemaMigration Load (1.1ms) SELECT "schema_migrations".* FROM "schema_migrations"
Started GET "/cable/" [WebSocket] for 127.0.0.1 at 2018-03-30 14:06:23 +0100
Successfully upgraded to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: Upgrade, HTTP_UPGRADE: websocket)
ProductsChannel is transmitting the subscription confirmation
ProductsChannel is streaming from products
Started GET "/orders/new" for 127.0.0.1 at 2018-03-30 14:06:25 +0100
Processing by OrdersController#new as HTML
Cart Load (0.0ms) SELECT "carts".* FROM "carts" WHERE "carts"."id" = ? LIMIT ? [["id", nil], ["LIMIT", 1]]
(0.0ms) begin transaction
SQL (3.0ms) INSERT INTO "carts" ("created_at", "updated_at") VALUES (?, ?) [["created_at", "2018-03-30 13:06:25.693988"], ["updated_at", "2018-03-30 13:06:25.693988"]]
(102.4ms) commit transaction
LineItem Exists (1.0ms) SELECT 1 AS one FROM "line_items" WHERE "line_items"."cart_id" = ? LIMIT ? [["cart_id", 35], ["LIMIT", 1]]
Redirected to http://localhost:3000/
Filter chain halted as :ensure_cart_isnt_empty rendered or redirected
Completed 302 Found in 446ms (ActiveRecord: 112.3ms)
Finished "/cable/" [WebSocket] for 127.0.0.1 at 2018-03-30 14:06:40 +0100
Started GET "/cable" for 127.0.0.1 at 2018-03-30 14:06:40 +0100
ProductsChannel stopped streaming from products
Started GET "/cable" for 127.0.0.1 at 2018-03-30 14:06:40 +0100
Started GET "/" for 127.0.0.1 at 2018-03-30 14:06:40 +0100
Started GET "/cable/" [WebSocket] for 127.0.0.1 at 2018-03-30 14:06:40 +0100
Started GET "/cable/" [WebSocket] for 127.0.0.1 at 2018-03-30 14:06:40 +0100
Successfully upgraded to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: Upgrade, HTTP_UPGRADE: websocket)
Successfully upgraded to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: Upgrade, HTTP_UPGRADE: websocket)
Processing by StoreController#index as HTML
Finished "/cable/" [WebSocket] for 127.0.0.1 at 2018-03-30 14:06:40 +0100
Cart Load (1.0ms) SELECT "carts".* FROM "carts" WHERE "carts"."id" = ? LIMIT ? [["id", 35], ["LIMIT", 1]]
ProductsChannel is transmitting the subscription confirmation
ProductsChannel is streaming from products
Rendering store/index.html.erb within layouts/application
Product Load (0.0ms) SELECT "products".* FROM "products" ORDER BY "products"."title" ASC
Rendered store/index.html.erb within layouts/application (1076.5ms)
Completed 500 Internal Server Error in 1315ms (ActiveRecord: 3.1ms)
ActionView::Template::Error (no implicit conversion of String into Hash):
10: <h3><%= product.title %></h3>
11: <%= sanitize(product.description) %>
12: <div class="price_line">
13: <span class="price"><%= number_to_currency(product.price) %></span>
14: <%= button_to t('.add_html'),
15: line_items_path(product_id: product, locale: I18n.locale),
16: remote: true %>
app/views/store/index.html.erb:13:in `block (3 levels) in _app_views_store_index_html_erb__666600258_62743356'
app/views/store/index.html.erb:7:in `block (2 levels) in _app_views_store_index_html_erb__666600258_62743356'
app/views/store/index.html.erb:6:in `block in _app_views_store_index_html_erb__666600258_62743356'
app/views/store/index.html.erb:5:in `_app_views_store_index_html_erb__666600258_62743356'
Rendering C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout
Rendering C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_source.html.erb
Rendered C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (13.9ms)
Rendering C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
Rendered C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (8.0ms)
Rendering C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb
Rendered C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (2.0ms)
Rendered C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout (3326.8ms)
Finished "/cable/" [WebSocket] for 127.0.0.1 at 2018-03-30 14:06:55 +0100
ProductsChannel stopped streaming from products
答案 0 :(得分：0)
试试这个
<%= number_to_currency(product.price.to_f) %>
而不是
<%= number_to_currency(product.price) %>
希望它对你有用。