我在尝试跟踪模型时遇到wrong number of arguments (given 2, expected 0..1)错误。
我的模特：
class Codetip < ApplicationRecord
belongs_to :user
is_impressionable
validates :title, presence: true, length: { minimum: 4 }
validates :body, presence: true, length: { minimum: 4 }
validates :user_id, presence: true
extend FriendlyId
friendly_id :name, use: :slugged
end
Codetip控制器：
正如https://github.com/charlotte-ruby/impressionist在使用情况下第4节中所建议的那样。
def show
@codetip = Codetip.friendly.find(params[:id])
impressionist(@codetip)
end
我的展示视图：
<%= @codetip.impressionist_count %>
接下来我做了wiki建议的所有内容：添加了gem，捆绑，生成了展示表并迁移了它。
更新1
堆栈跟踪
activerecord (5.0.0.beta3) lib/active_record/associations/collection_proxy.rb:731:in `count'
impressionist (1.5.1) app/models/impressionist/impressionable.rb:47:in `impressionist_count'
app/views/codetips/show.html.erb:2:in `_app_views_codetips_show_html_erb__4508833467180784211_70228361271700'
actionview (5.0.0.beta3) lib/action_view/template.rb:158:in `block in render'
activesupport (5.0.0.beta3) lib/active_support/notifications.rb:166:in `instrument'
actionview (5.0.0.beta3) lib/action_view/template.rb:348:in `instrument'
actionview (5.0.0.beta3) lib/action_view/template.rb:156:in `render'
actionview (5.0.0.beta3) lib/action_view/renderer/template_renderer.rb:54:in `block (2 levels) in render_template'
actionview (5.0.0.beta3) lib/action_view/renderer/abstract_renderer.rb:42:in `block in instrument'
activesupport (5.0.0.beta3) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (5.0.0.beta3) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
activesupport (5.0.0.beta3) lib/active_support/notifications.rb:164:in `instrument'
actionview (5.0.0.beta3) lib/action_view/renderer/abstract_renderer.rb:41:in `instrument'
actionview (5.0.0.beta3) lib/action_view/renderer/template_renderer.rb:53:in `block in render_template'
actionview (5.0.0.beta3) lib/action_view/renderer/template_renderer.rb:61:in `render_with_layout'
actionview (5.0.0.beta3) lib/action_view/renderer/template_renderer.rb:52:in `render_template'
actionview (5.0.0.beta3) lib/action_view/renderer/template_renderer.rb:14:in `render'
actionview (5.0.0.beta3) lib/action_view/renderer/renderer.rb:42:in `render_template'
actionview (5.0.0.beta3) lib/action_view/renderer/renderer.rb:23:in `render'
actionview (5.0.0.beta3) lib/action_view/rendering.rb:103:in `_render_template'
actionpack (5.0.0.beta3) lib/action_controller/metal/streaming.rb:217:in `_render_template'
actionview (5.0.0.beta3) lib/action_view/rendering.rb:83:in `render_to_body'
actionpack (5.0.0.beta3) lib/action_controller/metal/rendering.rb:52:in `render_to_body'
actionpack (5.0.0.beta3) lib/action_controller/metal/renderers.rb:144:in `render_to_body'
actionpack (5.0.0.beta3) lib/abstract_controller/rendering.rb:25:in `render'
actionpack (5.0.0.beta3) lib/action_controller/metal/rendering.rb:36:in `render'
actionpack (5.0.0.beta3) lib/action_controller/metal/instrumentation.rb:43:in `block (2 levels) in render'
activesupport (5.0.0.beta3) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
/Users/Etore/.rbenv/versions/2.3.0/lib/ruby/2.3.0/benchmark.rb:308:in `realtime'
activesupport (5.0.0.beta3) lib/active_support/core_ext/benchmark.rb:12:in `ms'
actionpack (5.0.0.beta3) lib/action_controller/metal/instrumentation.rb:43:in `block in render'
actionpack (5.0.0.beta3) lib/action_controller/metal/instrumentation.rb:86:in `cleanup_view_runtime'
activerecord (5.0.0.beta3) lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime'
actionpack (5.0.0.beta3) lib/action_controller/metal/instrumentation.rb:42:in `render'
actionpack (5.0.0.beta3) lib/action_controller/metal/implicit_render.rb:19:in `default_render'
actionpack (5.0.0.beta3) lib/action_controller/metal/basic_implicit_render.rb:4:in `block in send_action'
actionpack (5.0.0.beta3) lib/action_controller/metal/basic_implicit_render.rb:4:in `tap'
actionpack (5.0.0.beta3) lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action'
actionpack (5.0.0.beta3) lib/abstract_controller/base.rb:183:in `process_action'
actionpack (5.0.0.beta3) lib/action_controller/metal/rendering.rb:30:in `process_action'
actionpack (5.0.0.beta3) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:126:in `call'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:506:in `block (2 levels) in compile'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:455:in `call'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:101:in `__run_callbacks__'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:750:in `_run_process_action_callbacks'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:90:in `run_callbacks'
actionpack (5.0.0.beta3) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (5.0.0.beta3) lib/action_controller/metal/rescue.rb:27:in `process_action'
actionpack (5.0.0.beta3) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (5.0.0.beta3) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (5.0.0.beta3) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
activesupport (5.0.0.beta3) lib/active_support/notifications.rb:164:in `instrument'
actionpack (5.0.0.beta3) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (5.0.0.beta3) lib/action_controller/metal/params_wrapper.rb:248:in `process_action'
activerecord (5.0.0.beta3) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (5.0.0.beta3) lib/abstract_controller/base.rb:128:in `process'
actionview (5.0.0.beta3) lib/action_view/rendering.rb:30:in `process'
actionpack (5.0.0.beta3) lib/action_controller/metal.rb:190:in `dispatch'
actionpack (5.0.0.beta3) lib/action_controller/metal.rb:262:in `dispatch'
actionpack (5.0.0.beta3) lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
actionpack (5.0.0.beta3) lib/action_dispatch/routing/route_set.rb:32:in `serve'
actionpack (5.0.0.beta3) lib/action_dispatch/journey/router.rb:39:in `block in serve'
actionpack (5.0.0.beta3) lib/action_dispatch/journey/router.rb:26:in `each'
actionpack (5.0.0.beta3) lib/action_dispatch/journey/router.rb:26:in `serve'
actionpack (5.0.0.beta3) lib/action_dispatch/routing/route_set.rb:724:in `call'
actionview (5.0.0.beta3) lib/action_view/digestor.rb:12:in `call'
warden (1.2.6) lib/warden/manager.rb:35:in `block in call'
warden (1.2.6) lib/warden/manager.rb:34:in `catch'
warden (1.2.6) lib/warden/manager.rb:34:in `call'
rack (2.0.0.alpha) lib/rack/etag.rb:25:in `call'
rack (2.0.0.alpha) lib/rack/conditional_get.rb:25:in `call'
rack (2.0.0.alpha) lib/rack/head.rb:12:in `call'
rack (2.0.0.alpha) lib/rack/session/abstract/id.rb:220:in `context'
rack (2.0.0.alpha) lib/rack/session/abstract/id.rb:214:in `call'
actionpack (5.0.0.beta3) lib/action_dispatch/middleware/cookies.rb:613:in `call'
activerecord (5.0.0.beta3) lib/active_record/query_cache.rb:36:in `call'
activerecord (5.0.0.beta3) lib/active_record/connection_adapters/abstract/connection_pool.rb:963:in `call'
activerecord (5.0.0.beta3) lib/active_record/migration.rb:558:in `call'
actionpack (5.0.0.beta3) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:97:in `__run_callbacks__'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:750:in `_run_call_callbacks'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:90:in `run_callbacks'
actionpack (5.0.0.beta3) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (5.0.0.beta3) lib/action_dispatch/middleware/reloader.rb:71:in `call'
actionpack (5.0.0.beta3) lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
actionpack (5.0.0.beta3) lib/action_dispatch/middleware/debug_exceptions.rb:49:in `call'
web-console (3.1.1) lib/web_console/middleware.rb:131:in `call_app'
web-console (3.1.1) lib/web_console/middleware.rb:28:in `block in call'
web-console (3.1.1) lib/web_console/middleware.rb:18:in `catch'
web-console (3.1.1) lib/web_console/middleware.rb:18:in `call'
actionpack (5.0.0.beta3) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
railties (5.0.0.beta3) lib/rails/rack/logger.rb:36:in `call_app'
railties (5.0.0.beta3) lib/rails/rack/logger.rb:24:in `block in call'
activesupport (5.0.0.beta3) lib/active_support/tagged_logging.rb:70:in `block in tagged'
activesupport (5.0.0.beta3) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (5.0.0.beta3) lib/active_support/tagged_logging.rb:70:in `tagged'
railties (5.0.0.beta3) lib/rails/rack/logger.rb:24:in `call'
actionpack (5.0.0.beta3) lib/action_dispatch/middleware/request_id.rb:24:in `call'
rack (2.0.0.alpha) lib/rack/method_override.rb:22:in `call'
rack (2.0.0.alpha) lib/rack/runtime.rb:22:in `call'
activesupport (5.0.0.beta3) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
actionpack (5.0.0.beta3) lib/action_dispatch/middleware/load_interlock.rb:13:in `call'
actionpack (5.0.0.beta3) lib/action_dispatch/middleware/static.rb:136:in `call'
rack (2.0.0.alpha) lib/rack/sendfile.rb:111:in `call'
railties (5.0.0.beta3) lib/rails/engine.rb:522:in `call'
puma (3.0.2) lib/puma/configuration.rb:221:in `call'
puma (3.0.2) lib/puma/server.rb:561:in `handle_request'
puma (3.0.2) lib/puma/server.rb:406:in `process_client'
puma (3.0.2) lib/puma/server.rb:271:in `block in run'
puma (3.0.2) lib/puma/thread_pool.rb:111:in `block in spawn_thread'
答案 0 :(得分：1)
我发现了问题所在。
在我的展示页面上，它应该是<%= @codetip.impressions.count %>而不是<%= @codetip.impressionist_count %>。可以将此主题标记为已解决。
答案 1 :(得分：0)
将gems文件中的条件更新为app/models/impressionist/impressionable.rb
将if Rails::VERSION::MAJOR == 4替换为if Rails::VERSION::MAJOR >= 4
请参阅https://github.com/charlotte-ruby/impressionist/issues/212