轨道控制器中的doublerender错误

Question

我确实一直在浏览器中调用控制器，出现doublerenderError，如下所示。请告诉我为什么..我只呈现一次..我永远不会有一个重定向或类似的东西：/

这是我的控制器

class BezirkController < ApplicationController 
caches_page :index 
    def index 
     Bezirk.find_each do |bezirk| 
       render :json => bezirk 
     end 
    end 
end 

这是错误消息：

actionpack (3.2.8) lib/action_controller/metal/rendering.rb:15:in `render' 
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render' 
activesupport (3.2.8) lib/active_support/core_ext/benchmark.rb:5:in `block in ms' 
/usr/lib/ruby/1.9.1/benchmark.rb:295:in `realtime' 
activesupport (3.2.8) lib/active_support/core_ext/benchmark.rb:5:in `ms' 
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:40:in `block in render' 
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime' 
activerecord (3.2.8) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime' 
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:39:in `render' 
app/controllers/bezirk_controller.rb:5:in `block in index' 
activerecord (3.2.8) lib/active_record/relation/batches.rb:21:in `block (2 levels) in find_each' 
activerecord (3.2.8) lib/active_record/relation/batches.rb:21:in `each' 
activerecord (3.2.8) lib/active_record/relation/batches.rb:21:in `block in find_each' 
activerecord (3.2.8) lib/active_record/relation/batches.rb:72:in `find_in_batches' 
activerecord (3.2.8) lib/active_record/relation/batches.rb:20:in `find_each' 
activerecord (3.2.8) lib/active_record/querying.rb:8:in `find_each' 
app/controllers/bezirk_controller.rb:4:in `index' 
actionpack (3.2.8) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
actionpack (3.2.8) lib/abstract_controller/base.rb:167:in `process_action' 
actionpack (3.2.8) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (3.2.8) lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
activesupport (3.2.8) lib/active_support/callbacks.rb:414:in `_run__149640372__process_action__195728711__callbacks' 
activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.8) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 
activesupport (3.2.8) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.2.8) lib/abstract_controller/callbacks.rb:17:in `process_action' 
actionpack (3.2.8) lib/action_controller/metal/rescue.rb:29:in `process_action' 
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
activesupport (3.2.8) lib/active_support/notifications.rb:123:in `block in instrument' 
activesupport (3.2.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (3.2.8) lib/active_support/notifications.rb:123:in `instrument' 
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
actionpack (3.2.8) lib/action_controller/metal/params_wrapper.rb:207:in `process_action' 
activerecord (3.2.8) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
actionpack (3.2.8) lib/abstract_controller/base.rb:121:in `process' 
actionpack (3.2.8) lib/abstract_controller/rendering.rb:45:in `process' 
actionpack (3.2.8) lib/action_controller/metal.rb:203:in `dispatch' 
actionpack (3.2.8) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
actionpack (3.2.8) lib/action_controller/metal.rb:246:in `block in action' 
actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:73:in `call' 
actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' 
actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:36:in `call' 
journey (1.0.4) lib/journey/router.rb:68:in `block in call' 
journey (1.0.4) lib/journey/router.rb:56:in `each' 
journey (1.0.4) lib/journey/router.rb:56:in `call' 
actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:600:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
rack (1.4.1) lib/rack/etag.rb:23:in `call' 
rack (1.4.1) lib/rack/conditionalget.rb:25:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/head.rb:14:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/flash.rb:242:in `call' 
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context' 
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/cookies.rb:339:in `call' 
activerecord (3.2.8) lib/active_record/query_cache.rb:64:in `call' 
activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `_run__312425612__call__1069087096__callbacks' 
activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.8) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
activesupport (3.2.8) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.2.8) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/reloader.rb:65:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
railties (3.2.8) lib/rails/rack/logger.rb:26:in `call_app' 
railties (3.2.8) lib/rails/rack/logger.rb:16:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/request_id.rb:22:in `call' 
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call' 
rack (1.4.1) lib/rack/runtime.rb:17:in `call' 
activesupport (3.2.8) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
rack (1.4.1) lib/rack/lock.rb:15:in `call' 
actionpack (3.2.8) lib/action_dispatch/middleware/static.rb:62:in `call' 
rack-cache (1.2) lib/rack/cache/context.rb:136:in `forward' 
rack-cache (1.2) lib/rack/cache/context.rb:207:in `validate' 
rack-cache (1.2) lib/rack/cache/context.rb:181:in `lookup' 
rack-cache (1.2) lib/rack/cache/context.rb:66:in `call!' 
rack-cache (1.2) lib/rack/cache/context.rb:51:in `call' 
railties (3.2.8) lib/rails/engine.rb:479:in `call' 
railties (3.2.8) lib/rails/application.rb:223:in `call' 
rack (1.4.1) lib/rack/content_length.rb:14:in `call' 
railties (3.2.8) lib/rails/rack/log_tailer.rb:17:in `call' 
rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service' 
/usr/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' 
/usr/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' 
/usr/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread' 

Answer 1

您正处于每个循环中，它正在调用渲染循环中的每个循环。

任一操作：

def index 
    render :json => Bezirk.all 
end 

或

def index 
    Bezirk.find_each do |bezirk| 
    ... #build up a hash to render 
    end 
    render :json => your_built_hash 
end 

------- --- EDITED

def index 
    bezirks = [] 
    Bezirk.find_each do |bezirk| 
    bezirks << bezirk.attributes 
    end 
    render :json => {:bezirks => bezirks} 
end