我正在尝试检查图像是否可用，如果不是，则返回通用图像。我希望这段代码可以解决问题，但它告诉我方法不存在
控制器
@products = Supplier
.joins(:variants)
.joins('INNER JOIN products on products.id = variants.product_id')
.where('suppliers.id = ?', params[:id])
.group('suppliers.id','products.id','products.name')
.pluck('suppliers.id as supplier_id','products.id as prod_id','products.name as prod_name')
查看
- @products.each_with_index do |product, i|
.product-list.grid-block
.small-8.grid-content.text-center
%h4= product[1].titlecase
- @sizes.each do |size|
- if size[0] == product[0]
= link_to size[1], product_path(product[0]), class: 'hollow button tiny'
%small= number_to_currency(size[2])
.small-4
= link_to product_path(product, supplier_id: @supplier), title: product[1] do
= product[1].image_available
模型
def image_available(product)
(Rails.application.assets.find_asset("products/#{product.downcase.tr(' ', '-')}.jpg").nil?) ?
ActionController::Base.helpers.image_tag('products/generic.jpg', size: '50', alt: product.titlecase, title: product.titlecase) :
ActionController::Base.helpers.image_tag("products/#{product.downcase.tr(' ', '-')}.jpg", size: '50', alt: product.titlecase, title: product.titlecase)
end
错误记录
Started GET "/suppliers/1" for 127.0.0.1 at 2016-01-06 20:31:53 +1100
Processing by SuppliersController#show as HTML
Parameters: {"id"=>"1"}
User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT 1 [["id", 1]]
Supplier Load (0.3ms) SELECT "suppliers".* FROM "suppliers" WHERE "suppliers"."id" = $1 LIMIT 1 [["id", 1]]
(1.3ms) SELECT products.id as prod_id, products.name as prod_name FROM "suppliers" INNER JOIN "variant_suppliers" ON "variant_suppliers"."supplier_id" = "suppliers"."id" INNER JOIN "variants" ON "variants"."id" = "variant_suppliers"."variant_id" INNER JOIN products on products.id = variants.product_id WHERE (suppliers.id = '1') GROUP BY products.id, products.name
(2.8ms) SELECT products.id as prod_id, LEFT(variant_properties.description,1) as short_desc, variants.price as price FROM "suppliers" INNER JOIN "variant_suppliers" ON "variant_suppliers"."supplier_id" = "suppliers"."id" INNER JOIN variants on variants.id = variant_suppliers.variant_id INNER JOIN products on products.id = variants.product_id INNER JOIN variant_properties on variant_properties.variant_id = variants.id INNER JOIN properties on properties.id = variant_properties.property_id AND properties.display_name ='Size' WHERE (suppliers.id = '1')
Rendered suppliers/show.html.haml within layouts/application (4.5ms)
Completed 500 Internal Server Error in 74ms (ActiveRecord: 12.0ms)
NoMethodError - undefined method `image_available' for "Bubble Tea":String:
app/views/suppliers/show.html.haml:12:in `block (2 levels) in _app_views_suppliers_show_html_haml___1626246587383268315_70147714796320'
haml (4.0.7) lib/haml/helpers.rb:368:in `block in capture_haml'
haml (4.0.7) lib/haml/helpers.rb:608:in `with_haml_buffer'
haml (4.0.7) lib/haml/helpers.rb:364:in `capture_haml'
haml (4.0.7) lib/haml/helpers/xss_mods.rb:61:in `capture_haml_with_haml_xss'
haml (4.0.7) lib/haml/helpers/action_view_mods.rb:45:in `capture_with_haml'
actionview (4.2.4) lib/action_view/helpers/tag_helper.rb:106:in `content_tag'
haml (4.0.7) lib/haml/helpers/action_view_mods.rb:69:in `content_tag_with_haml'
actionview (4.2.4) lib/action_view/helpers/url_helper.rb:184:in `link_to'
app/views/suppliers/show.html.haml:11:in `block in _app_views_suppliers_show_html_haml___1626246587383268315_70147714796320'
app/views/suppliers/show.html.haml:2:in `_app_views_suppliers_show_html_haml___1626246587383268315_70147714796320'
actionview (4.2.4) lib/action_view/template.rb:145:in `block in render'
activesupport (4.2.4) lib/active_support/notifications.rb:166:in `instrument'
actionview (4.2.4) lib/action_view/template.rb:333:in `instrument'
actionview (4.2.4) lib/action_view/template.rb:143:in `render'
actionview (4.2.4) lib/action_view/renderer/template_renderer.rb:54:in `block (2 levels) in render_template'
actionview (4.2.4) lib/action_view/renderer/abstract_renderer.rb:39:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `instrument'
actionview (4.2.4) lib/action_view/renderer/abstract_renderer.rb:39:in `instrument'
actionview (4.2.4) lib/action_view/renderer/template_renderer.rb:53:in `block in render_template'
actionview (4.2.4) lib/action_view/renderer/template_renderer.rb:61:in `render_with_layout'
actionview (4.2.4) lib/action_view/renderer/template_renderer.rb:52:in `render_template'
actionview (4.2.4) lib/action_view/renderer/template_renderer.rb:14:in `render'
actionview (4.2.4) lib/action_view/renderer/renderer.rb:42:in `render_template'
actionview (4.2.4) lib/action_view/renderer/renderer.rb:23:in `render'
actionview (4.2.4) lib/action_view/rendering.rb:100:in `_render_template'
actionpack (4.2.4) lib/action_controller/metal/streaming.rb:217:in `_render_template'
actionview (4.2.4) lib/action_view/rendering.rb:83:in `render_to_body'
actionpack (4.2.4) lib/action_controller/metal/rendering.rb:32:in `render_to_body'
actionpack (4.2.4) lib/action_controller/metal/renderers.rb:37:in `render_to_body'
actionpack (4.2.4) lib/abstract_controller/rendering.rb:25:in `render'
actionpack (4.2.4) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:44:in `block (2 levels) in render'
activesupport (4.2.4) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
/Users/paulmcguane/.rbenv/versions/2.2.1/lib/ruby/2.2.0/benchmark.rb:303:in `realtime'
activesupport (4.2.4) lib/active_support/core_ext/benchmark.rb:12:in `ms'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:44:in `block in render'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:87:in `cleanup_view_runtime'
activerecord (4.2.4) lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:43:in `render'
actionpack (4.2.4) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
actionpack (4.2.4) lib/action_controller/metal/implicit_render.rb:5:in `send_action'
actionpack (4.2.4) lib/abstract_controller/base.rb:198:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.2.4) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.2.4) lib/active_support/callbacks.rb:117:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:555:in `block (2 levels) in compile'
activesupport (4.2.4) lib/active_support/callbacks.rb:505:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:92:in `__run_callbacks__'
activesupport (4.2.4) lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks'
activesupport (4.2.4) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.4) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `instrument'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.2.4) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.2.4) lib/abstract_controller/base.rb:137:in `process'
actionview (4.2.4) lib/action_view/rendering.rb:30:in `process'
actionpack (4.2.4) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.2.4) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.2.4) lib/action_controller/metal.rb:237:in `block in action'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:76:in `dispatch'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:45:in `serve'
actionpack (4.2.4) lib/action_dispatch/journey/router.rb:43:in `block in serve'
actionpack (4.2.4) lib/action_dispatch/journey/router.rb:30:in `serve'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:821:in `call'
bullet (4.14.10) lib/bullet/rack.rb:12:in `call'
warden (1.2.4) lib/warden/manager.rb:35:in `block in call'
warden (1.2.4) lib/warden/manager.rb:34:in `call'
rack (1.6.4) lib/rack/etag.rb:24:in `call'
rack (1.6.4) lib/rack/conditionalget.rb:25:in `call'
rack (1.6.4) lib/rack/head.rb:13:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/flash.rb:260:in `call'
rack (1.6.4) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.6.4) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.2.4) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.2.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in `call'
activerecord (4.2.4) lib/active_record/migration.rb:377:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.2.4) lib/active_support/callbacks.rb:88:in `__run_callbacks__'
activesupport (4.2.4) lib/active_support/callbacks.rb:778:in `_run_call_callbacks'
activesupport (4.2.4) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
better_errors (2.1.1) lib/better_errors/middleware.rb:84:in `protected_app_call'
better_errors (2.1.1) lib/better_errors/middleware.rb:79:in `better_errors_call'
better_errors (2.1.1) lib/better_errors/middleware.rb:57:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.2.4) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.2.4) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.2.4) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.2.4) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.2.4) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.2.4) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.6.4) lib/rack/methodoverride.rb:22:in `call'
rack (1.6.4) lib/rack/runtime.rb:18:in `call'
activesupport (4.2.4) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
rack (1.6.4) lib/rack/lock.rb:17:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/static.rb:116:in `call'
rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
railties (4.2.4) lib/rails/engine.rb:518:in `call'
railties (4.2.4) lib/rails/application.rb:165:in `call'
rack (1.6.4) lib/rack/content_length.rb:15:in `call'
puma (2.15.3) lib/puma/server.rb:541:in `handle_request'
puma (2.15.3) lib/puma/server.rb:388:in `process_client'
puma (2.15.3) lib/puma/server.rb:270:in `block in run'
puma (2.15.3) lib/puma/thread_pool.rb:106:in `block in spawn_thread'
Started POST "/__better_errors/e4e72c26f6073831/variables" for 127.0.0.1 at 2016-01-06 20:31:54 +1100
答案 0 :(得分：0)
首先，您将方法应用于product[1]而不是product。 product[1]是一个字符串，您没有为String类定义该方法。
代码还有其他问题....你指定的方法是“在模型中”但你没有明确说出哪个模型。您将参数传递给方法(product)，但是当您在视图中实际使用它时，不会传递参数。
你可能真的想把它叫做......
= product.image_available[product.prod_name]