【发布时间】：2021-01-30 09:38:51
【问题描述】：
这是我的第一个 ruby on rails 应用程序。我想做一个非常简单的计算器，但它不会计算。我想在服务器站点上计算。代码如下
routes.rb:
Rails.application.routes.draw do
get 'calculators/new'
get 'calculators/create'
resources :calculators
root to: 'calculators#new'
# For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
end
app\views\calculators\create.html.erb
document.getElementById("sum").innerHTML = <%= @sum %>
app\views\calculators\new.html.erb
<%= form_tag calculators_path, :method => :post, :remote => true do %>
<%= text_field_tag :data, nil, :onkeyup => "this.form.sub.click()" %> = <span id="sum"></span>
<%= submit_tag "ok", :name => "sub"%>
<% end %>
app\controllers\calculators_controller.rb
class CalculatorsController < ApplicationController
def create
@sum = eval(params[:data])
end
end
日志中出现以下错误：
浏览器
SyntaxError in CalculatorsController#create
(eval):1: syntax error, unexpected end-of-input
Rails.root: /home/crancode/Desktop/studia/zad3_v3
Application Trace
(eval):1: syntax error, unexpected end-of-input
(eval):1: syntax error, unexpected end-of-input
(eval):1: syntax error, unexpected end-of-input
app/controllers/calculators_controller.rb:3:in `eval'
app/controllers/calculators_controller.rb:3:in `create'
Framework Trace
actionpack (6.1.1) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
actionpack (6.1.1) lib/abstract_controller/base.rb:228:in `process_action'
actionpack (6.1.1) lib/action_controller/metal/rendering.rb:30:in `process_action'
actionpack (6.1.1) lib/abstract_controller/callbacks.rb:42:in `block in process_action'
activesupport (6.1.1) lib/active_support/callbacks.rb:117:in `block in run_callbacks'
actiontext (6.1.1) lib/action_text/rendering.rb:20:in `with_renderer'
actiontext (6.1.1) lib/action_text/engine.rb:55:in `block (4 levels) in <class:Engine>'
activesupport (6.1.1) lib/active_support/callbacks.rb:126:in `instance_exec'
activesupport (6.1.1) lib/active_support/callbacks.rb:126:in `block in run_callbacks'
activesupport (6.1.1) lib/active_support/callbacks.rb:137:in `run_callbacks'
actionpack (6.1.1) lib/abstract_controller/callbacks.rb:41:in `process_action'
actionpack (6.1.1) lib/action_controller/metal/rescue.rb:22:in `process_action'
actionpack (6.1.1) lib/action_controller/metal/instrumentation.rb:34:in `block in process_action'
activesupport (6.1.1) lib/active_support/notifications.rb:203:in `block in instrument'
activesupport (6.1.1) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
activesupport (6.1.1) lib/active_support/notifications.rb:203:in `instrument'
actionpack (6.1.1) lib/action_controller/metal/instrumentation.rb:33:in `process_action'
actionpack (6.1.1) lib/action_controller/metal/params_wrapper.rb:249:in `process_action'
activerecord (6.1.1) lib/active_record/railties/controller_runtime.rb:27:in `process_action'
actionpack (6.1.1) lib/abstract_controller/base.rb:165:in `process'
actionview (6.1.1) lib/action_view/rendering.rb:39:in `process'
actionpack (6.1.1) lib/action_controller/metal.rb:190:in `dispatch'
actionpack (6.1.1) lib/action_controller/metal.rb:254:in `dispatch'
actionpack (6.1.1) lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
actionpack (6.1.1) lib/action_dispatch/routing/route_set.rb:33:in `serve'
actionpack (6.1.1) lib/action_dispatch/journey/router.rb:50:in `block in serve'
actionpack (6.1.1) lib/action_dispatch/journey/router.rb:32:in `each'
actionpack (6.1.1) lib/action_dispatch/journey/router.rb:32:in `serve'
actionpack (6.1.1) lib/action_dispatch/routing/route_set.rb:842:in `call'
rack (2.2.3) lib/rack/tempfile_reaper.rb:15:in `call'
rack (2.2.3) lib/rack/etag.rb:27:in `call'
rack (2.2.3) lib/rack/conditional_get.rb:40:in `call'
rack (2.2.3) lib/rack/head.rb:12:in `call'
actionpack (6.1.1) lib/action_dispatch/http/permissions_policy.rb:22:in `call'
actionpack (6.1.1) lib/action_dispatch/http/content_security_policy.rb:18:in `call'
rack (2.2.3) lib/rack/session/abstract/id.rb:266:in `context'
rack (2.2.3) lib/rack/session/abstract/id.rb:260:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/cookies.rb:689:in `call'
activerecord (6.1.1) lib/active_record/migration.rb:601:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
activesupport (6.1.1) lib/active_support/callbacks.rb:98:in `run_callbacks'
actionpack (6.1.1) lib/action_dispatch/middleware/callbacks.rb:26:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/executor.rb:14:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/actionable_exceptions.rb:18:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/debug_exceptions.rb:29:in `call'
web-console (4.1.0) lib/web_console/middleware.rb:132:in `call_app'
web-console (4.1.0) lib/web_console/middleware.rb:28:in `block in call'
web-console (4.1.0) lib/web_console/middleware.rb:17:in `catch'
web-console (4.1.0) lib/web_console/middleware.rb:17:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
railties (6.1.1) lib/rails/rack/logger.rb:37:in `call_app'
railties (6.1.1) lib/rails/rack/logger.rb:26:in `block in call'
activesupport (6.1.1) lib/active_support/tagged_logging.rb:99:in `block in tagged'
activesupport (6.1.1) lib/active_support/tagged_logging.rb:37:in `tagged'
activesupport (6.1.1) lib/active_support/tagged_logging.rb:99:in `tagged'
railties (6.1.1) lib/rails/rack/logger.rb:26:in `call'
sprockets-rails (3.2.2) lib/sprockets/rails/quiet_assets.rb:13:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/request_id.rb:26:in `call'
rack (2.2.3) lib/rack/method_override.rb:24:in `call'
rack (2.2.3) lib/rack/runtime.rb:22:in `call'
activesupport (6.1.1) lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/executor.rb:14:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/static.rb:24:in `call'
rack (2.2.3) lib/rack/sendfile.rb:110:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/host_authorization.rb:98:in `call'
rack-mini-profiler (2.3.1) lib/mini_profiler/profiler.rb:373:in `call'
webpacker (5.2.1) lib/webpacker/dev_server_proxy.rb:25:in `perform_request'
rack-proxy (0.6.5) lib/rack/proxy.rb:57:in `call'
railties (6.1.1) lib/rails/engine.rb:539:in `call'
puma (5.2.0) lib/puma/configuration.rb:247:in `call'
puma (5.2.0) lib/puma/request.rb:76:in `block in handle_request'
puma (5.2.0) lib/puma/thread_pool.rb:337:in `with_force_shutdown'
puma (5.2.0) lib/puma/request.rb:75:in `handle_request'
puma (5.2.0) lib/puma/server.rb:432:in `process_client'
puma (5.2.0) lib/puma/thread_pool.rb:145:in `block in spawn_thread'
Full Trace
(eval):1: syntax error, unexpected end-of-input
(eval):1: syntax error, unexpected end-of-input
(eval):1: syntax error, unexpected end-of-input
app/controllers/calculators_controller.rb:3:in `eval'
app/controllers/calculators_controller.rb:3:in `create'
actionpack (6.1.1) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
actionpack (6.1.1) lib/abstract_controller/base.rb:228:in `process_action'
actionpack (6.1.1) lib/action_controller/metal/rendering.rb:30:in `process_action'
actionpack (6.1.1) lib/abstract_controller/callbacks.rb:42:in `block in process_action'
activesupport (6.1.1) lib/active_support/callbacks.rb:117:in `block in run_callbacks'
actiontext (6.1.1) lib/action_text/rendering.rb:20:in `with_renderer'
actiontext (6.1.1) lib/action_text/engine.rb:55:in `block (4 levels) in <class:Engine>'
activesupport (6.1.1) lib/active_support/callbacks.rb:126:in `instance_exec'
activesupport (6.1.1) lib/active_support/callbacks.rb:126:in `block in run_callbacks'
activesupport (6.1.1) lib/active_support/callbacks.rb:137:in `run_callbacks'
actionpack (6.1.1) lib/abstract_controller/callbacks.rb:41:in `process_action'
actionpack (6.1.1) lib/action_controller/metal/rescue.rb:22:in `process_action'
actionpack (6.1.1) lib/action_controller/metal/instrumentation.rb:34:in `block in process_action'
activesupport (6.1.1) lib/active_support/notifications.rb:203:in `block in instrument'
activesupport (6.1.1) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
activesupport (6.1.1) lib/active_support/notifications.rb:203:in `instrument'
actionpack (6.1.1) lib/action_controller/metal/instrumentation.rb:33:in `process_action'
actionpack (6.1.1) lib/action_controller/metal/params_wrapper.rb:249:in `process_action'
activerecord (6.1.1) lib/active_record/railties/controller_runtime.rb:27:in `process_action'
actionpack (6.1.1) lib/abstract_controller/base.rb:165:in `process'
actionview (6.1.1) lib/action_view/rendering.rb:39:in `process'
actionpack (6.1.1) lib/action_controller/metal.rb:190:in `dispatch'
actionpack (6.1.1) lib/action_controller/metal.rb:254:in `dispatch'
actionpack (6.1.1) lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
actionpack (6.1.1) lib/action_dispatch/routing/route_set.rb:33:in `serve'
actionpack (6.1.1) lib/action_dispatch/journey/router.rb:50:in `block in serve'
actionpack (6.1.1) lib/action_dispatch/journey/router.rb:32:in `each'
actionpack (6.1.1) lib/action_dispatch/journey/router.rb:32:in `serve'
actionpack (6.1.1) lib/action_dispatch/routing/route_set.rb:842:in `call'
rack (2.2.3) lib/rack/tempfile_reaper.rb:15:in `call'
rack (2.2.3) lib/rack/etag.rb:27:in `call'
rack (2.2.3) lib/rack/conditional_get.rb:40:in `call'
rack (2.2.3) lib/rack/head.rb:12:in `call'
actionpack (6.1.1) lib/action_dispatch/http/permissions_policy.rb:22:in `call'
actionpack (6.1.1) lib/action_dispatch/http/content_security_policy.rb:18:in `call'
rack (2.2.3) lib/rack/session/abstract/id.rb:266:in `context'
rack (2.2.3) lib/rack/session/abstract/id.rb:260:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/cookies.rb:689:in `call'
activerecord (6.1.1) lib/active_record/migration.rb:601:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
activesupport (6.1.1) lib/active_support/callbacks.rb:98:in `run_callbacks'
actionpack (6.1.1) lib/action_dispatch/middleware/callbacks.rb:26:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/executor.rb:14:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/actionable_exceptions.rb:18:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/debug_exceptions.rb:29:in `call'
web-console (4.1.0) lib/web_console/middleware.rb:132:in `call_app'
web-console (4.1.0) lib/web_console/middleware.rb:28:in `block in call'
web-console (4.1.0) lib/web_console/middleware.rb:17:in `catch'
web-console (4.1.0) lib/web_console/middleware.rb:17:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
railties (6.1.1) lib/rails/rack/logger.rb:37:in `call_app'
railties (6.1.1) lib/rails/rack/logger.rb:26:in `block in call'
activesupport (6.1.1) lib/active_support/tagged_logging.rb:99:in `block in tagged'
activesupport (6.1.1) lib/active_support/tagged_logging.rb:37:in `tagged'
activesupport (6.1.1) lib/active_support/tagged_logging.rb:99:in `tagged'
railties (6.1.1) lib/rails/rack/logger.rb:26:in `call'
sprockets-rails (3.2.2) lib/sprockets/rails/quiet_assets.rb:13:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/request_id.rb:26:in `call'
rack (2.2.3) lib/rack/method_override.rb:24:in `call'
rack (2.2.3) lib/rack/runtime.rb:22:in `call'
activesupport (6.1.1) lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/executor.rb:14:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/static.rb:24:in `call'
rack (2.2.3) lib/rack/sendfile.rb:110:in `call'
actionpack (6.1.1) lib/action_dispatch/middleware/host_authorization.rb:98:in `call'
rack-mini-profiler (2.3.1) lib/mini_profiler/profiler.rb:373:in `call'
webpacker (5.2.1) lib/webpacker/dev_server_proxy.rb:25:in `perform_request'
rack-proxy (0.6.5) lib/rack/proxy.rb:57:in `call'
railties (6.1.1) lib/rails/engine.rb:539:in `call'
puma (5.2.0) lib/puma/configuration.rb:247:in `call'
puma (5.2.0) lib/puma/request.rb:76:in `block in handle_request'
puma (5.2.0) lib/puma/thread_pool.rb:337:in `with_force_shutdown'
puma (5.2.0) lib/puma/request.rb:75:in `handle_request'
puma (5.2.0) lib/puma/server.rb:432:in `process_client'
puma (5.2.0) lib/puma/thread_pool.rb:145:in `block in spawn_thread'
Request parameters
{"data"=>"2+",
"sub"=>"ok"}
Session dump
_csrf_token: "_HyGon2ni-rzV2v9haqyAKOPGTk52oSq7TpklxT1dgQ="
session_id: "de90be13838026449531cd93bdf17f15"
Env dump
GATEWAY_INTERFACE: "CGI/1.2"
HTTP_ACCEPT: "text/javascript, application/javascript, application/ecmascript, application/x-ecmascript, */*; q=0.01"
HTTP_ACCEPT_ENCODING: "gzip, deflate"
HTTP_ACCEPT_LANGUAGE: "en-US,en;q=0.5"
HTTP_ORIGIN: "http://localhost:3000"
HTTP_VERSION: "HTTP/1.1"
HTTP_X_CSRF_TOKEN: "Eng2-4pM0KCUfSpu_-pydplFUCbeurmEXlxnqVSQVNVNvw77fkYwl2-D28WD053sqIgavIUb7n8J8BLoUO-q9w"
ORIGINAL_SCRIPT_NAME: ""
REMOTE_ADDR: "127.0.0.1"
SERVER_NAME: "localhost"
SERVER_PROTOCOL: "HTTP/1.1"
Response headers
None
服务器
Started POST "/calculators" for 127.0.0.1 at 2021-01-30 15:23:17 +0100
Processing by CalculatorsController#create as JS
Parameters: {"data"=>"2+", "sub"=>"ok"}
Completed 500 Internal Server Error in 1ms (Allocations: 613)
SyntaxError ((eval):1: syntax error, unexpected end-of-input):
(eval):1: syntax error, unexpected end-of-input
(eval):1: syntax error, unexpected end-of-input
(eval):1: syntax error, unexpected end-of-input
app/controllers/calculators_controller.rb:3:in `eval'
app/controllers/calculators_controller.rb:3:in `create'
Started POST "/calculators" for 127.0.0.1 at 2021-01-30 15:23:18 +0100
Processing by CalculatorsController#create as JS
Parameters: {"data"=>"2+2", "sub"=>"ok"}
Rendering layout layouts/application.html.erb
Rendering calculators/create.html.erb within layouts/application
Rendered calculators/create.html.erb within layouts/application (Duration: 0.1ms | Allocations: 39)
[Webpacker] Everything's up-to-date. Nothing to do
Rendered layout layouts/application.html.erb (Duration: 8.5ms | Allocations: 3015)
Completed 200 OK in 10ms (Views: 9.3ms | Allocations: 3449)
谢谢
【问题讨论】：
-
但是为什么呢？如果你想学习 ajax，我明白，但这只是一个可笑的过度复杂的 Ruby Goldberg 解决方案，可以在客户端使用 javascript 处理。你不需要服务器做简单的计算。
-
我知道 Ruby 对这项任务来说太过分了，但这是我必须完成的学习任务的内容。用纯 js 或 java 做这个任务对我来说不是问题。
-
您在 Rails 服务器日志中看到了什么？它是否以正确的格式采取了正确的行动？您在浏览器的日志中看到了什么？它在做正确的要求吗？是否得到了正确的回应？ （检查 Networks 选项卡）你有任何 js 错误吗？
-
我现在已经在帖子中添加了日志
标签： ruby-on-rails ruby ajax