使用 AJAX 刷新 Rails 部分时的未定义方法
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【中文标题】使用 AJAX 刷新 Rails 部分时的未定义方法【英文标题】：Undefined Method when Refreshing Rails partial with AJAX 【发布时间】：2016-05-06 16:11:09 【问题描述】：我正在为如何使用 Rails 和 AJAX 重新加载部分而苦苦挣扎，并且遇到了未定义的方法错误。我认为这可能是因为我没有正确地将局部变量传递回部分，但我不确定这应该如何工作。
我有一个“项目”Show.html.erb 页面。在该显示页面上，与该项目相关的“投资”有一个特定的 DIV。
Show.html.erb
<div class="col-md-3" id="investments-container">
<%= render 'proj_investments' %>
</div>
然后，它会在 _proj_investments.html.erb 部分中呈现一个循环遍历与项目相关的所有投资（它按奖励类型分组）的部分。每个都有一个表单提交，允许以某种方式点击 INVEST 按钮并使用 AJAX 创建新的投资。 ( :js do |f| %> )
_proj_investments.html.erb
<% if @project.rewards.any? %>
<% @project.rewards.each do |reward| %>
<div class="panel panel-default project-rightpanel">
<div class="project-rightpanel-header">
<span class="project-rightpanel-header amount"><%=number_to_currency(reward.amount,precision: 0)%></span>
<span class="project-rightpanel-header amount"><%=reward.rewardtype.name %></span>
</div>
<div class="project-rightpanel-header">
<%=reward.investments.count(:amount)%> investments for <%=number_to_currency(reward.investments.sum(:amount),precision: 0)%>
</div>
</div>
<%= form_for [@investment, Investment.new], remote: true, "data-type" => :js do |f| %>
<div class="field">
<%= f.hidden_field :amount, :value => reward.amount %>
<%= f.hidden_field :User_id, :value => current_user.id %>
<%= f.hidden_field :Reward_id, :value => reward.id %>
</div>
<div class="actions">
<%= f.submit "INVEST", :class => "btn btn-success" %>
</div>
<% end %>
</div>
<% end %>
<% end %>
Investments 控制器然后调用 Create 方法并响应 JS 并调用我的 create.js.erb
investments_controller.rb
def create
@investment = Investment.new(investment_params)
respond_to do |format|
if @investment.save
format.js
format.html redirect_to @investment, notice: 'Investment was successfully created.'
format.json render :show, status: :created, location: @investment
else
format.html render :new
format.json render json: @investment.errors, status: :unprocessable_entity
end
end
结束
在 create.js.erb 中，我只想刷新原始 proj_investments 部分中的所有内容。但是，当我加载它时，当我使用此代码时，它会给我一个“未定义的方法‘投资’”错误：
创建.js.erb
$("#investments-container").html("<%= escape_javascript(render :partial => 'projects/proj_investments', :formats => :html)%>");
我认为这里发生的事情是 Rails 部分已经渲染，所以我尝试使用不再通过 AJAX 访问的项目、奖励和投资等对象。也许我需要在渲染部分时以某种方式传递这些对象。但我不知道该怎么做。或者，如果我在概念上错了，那也很高兴！
谢谢， 迈克
添加模型：
class Project < ActiveRecord::Base
belongs_to :user
belongs_to :genre
has_many :rewards, dependent: :destroy
has_many :investments, through: :rewards
has_many :collaborators
has_attached_file :image, :styles => :large => "600x600>", :medium => "300x300>", :thumb => "100x100>"
validates_attachment_content_type :image, :content_type => ["image/jpg", "image/jpeg", "image/png"]
validates :image, presence: true
accepts_nested_attributes_for :rewards,
reject_if: proc |attributes| attributes['name'].blank? ,
allow_destroy: true
accepts_nested_attributes_for :collaborators,
reject_if: proc |attributes| attributes['last'].blank? ,
allow_destroy: true
end
class Investment < ActiveRecord::Base
belongs_to :user
belongs_to :reward
belongs_to :project
end
class Reward < ActiveRecord::Base
belongs_to :project
belongs_to :rewardtype
has_many :investments, dependent: :destroy
validates :rewardtype, presence: true
validates :name,
presence: true
end
下面的完整堆栈跟踪：
D, [2016-01-28T21:44:45.289613 #50185] DEBUG -- :
D, [2016-01-28T21:44:45.289663 #50185] DEBUG -- :
D, [2016-01-28T21:44:45.289679 #50185] DEBUG -- :
D, [2016-01-28T21:44:45.289689 #50185] DEBUG -- :
I, [2016-01-28T21:44:45.289850 #50185] INFO -- : Started GET "/projects/28" for ::1 at 2016-01-28 21:44:45 -0800
I, [2016-01-28T21:44:45.289887 #50185] INFO -- : Started GET "/projects/28" for ::1 at 2016-01-28 21:44:45 -0800
D, [2016-01-28T21:44:45.298245 #50185] DEBUG -- : ActiveRecord::SchemaMigration Load (0.1ms) SELECT "schema_migrations".* FROM "schema_migrations"
D, [2016-01-28T21:44:45.298297 #50185] DEBUG -- : ActiveRecord::SchemaMigration Load (0.1ms) SELECT "schema_migrations".* FROM "schema_migrations"
I, [2016-01-28T21:44:45.326787 #50185] INFO -- : Processing by ProjectsController#show as HTML
I, [2016-01-28T21:44:45.326853 #50185] INFO -- : Processing by ProjectsController#show as HTML
I, [2016-01-28T21:44:45.326896 #50185] INFO -- : Parameters: "id"=>"28"
I, [2016-01-28T21:44:45.326923 #50185] INFO -- : Parameters: "id"=>"28"
D, [2016-01-28T21:44:45.349554 #50185] DEBUG -- : Project Load (0.2ms) SELECT "projects".* FROM "projects" WHERE "projects"."id" = ? LIMIT 1 [["id", 28]]
D, [2016-01-28T21:44:45.349601 #50185] DEBUG -- : Project Load (0.2ms) SELECT "projects".* FROM "projects" WHERE "projects"."id" = ? LIMIT 1 [["id", 28]]
D, [2016-01-28T21:44:45.375951 #50185] DEBUG -- : User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 2]]
D, [2016-01-28T21:44:45.376001 #50185] DEBUG -- : User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 2]]
D, [2016-01-28T21:44:45.418778 #50185] DEBUG -- : (0.2ms) SELECT SUM("investments"."amount") FROM "investments" INNER JOIN "rewards" ON "investments"."reward_id" = "rewards"."id" WHERE "rewards"."project_id" = ? [["project_id", 28]]
D, [2016-01-28T21:44:45.418823 #50185] DEBUG -- : (0.2ms) SELECT SUM("investments"."amount") FROM "investments" INNER JOIN "rewards" ON "investments"."reward_id" = "rewards"."id" WHERE "rewards"."project_id" = ? [["project_id", 28]]
D, [2016-01-28T21:44:45.438045 #50185] DEBUG -- : Reward Exists (0.1ms) SELECT 1 AS one FROM "rewards" WHERE "rewards"."project_id" = ? LIMIT 1 [["project_id", 28]]
D, [2016-01-28T21:44:45.438090 #50185] DEBUG -- : Reward Exists (0.1ms) SELECT 1 AS one FROM "rewards" WHERE "rewards"."project_id" = ? LIMIT 1 [["project_id", 28]]
D, [2016-01-28T21:44:45.438824 #50185] DEBUG -- : Reward Load (0.1ms) SELECT "rewards".* FROM "rewards" WHERE "rewards"."project_id" = ? [["project_id", 28]]
D, [2016-01-28T21:44:45.438858 #50185] DEBUG -- : Reward Load (0.1ms) SELECT "rewards".* FROM "rewards" WHERE "rewards"."project_id" = ? [["project_id", 28]]
D, [2016-01-28T21:44:45.448028 #50185] DEBUG -- : Rewardtype Load (0.1ms) SELECT "rewardtypes".* FROM "rewardtypes" WHERE "rewardtypes"."id" = ? LIMIT 1 [["id", 2]]
D, [2016-01-28T21:44:45.448074 #50185] DEBUG -- : Rewardtype Load (0.1ms) SELECT "rewardtypes".* FROM "rewardtypes" WHERE "rewardtypes"."id" = ? LIMIT 1 [["id", 2]]
D, [2016-01-28T21:44:45.453290 #50185] DEBUG -- : (0.2ms) SELECT COUNT("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 50]]
D, [2016-01-28T21:44:45.453370 #50185] DEBUG -- : (0.2ms) SELECT COUNT("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 50]]
D, [2016-01-28T21:44:45.455273 #50185] DEBUG -- : (0.3ms) SELECT SUM("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 50]]
D, [2016-01-28T21:44:45.455328 #50185] DEBUG -- : (0.3ms) SELECT SUM("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 50]]
D, [2016-01-28T21:44:45.476845 #50185] DEBUG -- : User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT 1 [["id", 2]]
D, [2016-01-28T21:44:45.476897 #50185] DEBUG -- : User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT 1 [["id", 2]]
D, [2016-01-28T21:44:45.478277 #50185] DEBUG -- : Rewardtype Load (0.1ms) SELECT "rewardtypes".* FROM "rewardtypes" WHERE "rewardtypes"."id" = ? LIMIT 1 [["id", 3]]
D, [2016-01-28T21:44:45.478313 #50185] DEBUG -- : Rewardtype Load (0.1ms) SELECT "rewardtypes".* FROM "rewardtypes" WHERE "rewardtypes"."id" = ? LIMIT 1 [["id", 3]]
D, [2016-01-28T21:44:45.479190 #50185] DEBUG -- : (0.1ms) SELECT COUNT("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 55]]
D, [2016-01-28T21:44:45.479218 #50185] DEBUG -- : (0.1ms) SELECT COUNT("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 55]]
D, [2016-01-28T21:44:45.479621 #50185] DEBUG -- : (0.1ms) SELECT SUM("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 55]]
D, [2016-01-28T21:44:45.479645 #50185] DEBUG -- : (0.1ms) SELECT SUM("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 55]]
D, [2016-01-28T21:44:45.481244 #50185] DEBUG -- : CACHE (0.0ms) SELECT "rewardtypes".* FROM "rewardtypes" WHERE "rewardtypes"."id" = ? LIMIT 1 [["id", 2]]
D, [2016-01-28T21:44:45.481287 #50185] DEBUG -- : CACHE (0.0ms) SELECT "rewardtypes".* FROM "rewardtypes" WHERE "rewardtypes"."id" = ? LIMIT 1 [["id", 2]]
D, [2016-01-28T21:44:45.482172 #50185] DEBUG -- : (0.1ms) SELECT COUNT("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 56]]
D, [2016-01-28T21:44:45.482204 #50185] DEBUG -- : (0.1ms) SELECT COUNT("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 56]]
D, [2016-01-28T21:44:45.482744 #50185] DEBUG -- : (0.1ms) SELECT SUM("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 56]]
D, [2016-01-28T21:44:45.482779 #50185] DEBUG -- : (0.1ms) SELECT SUM("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 56]]
D, [2016-01-28T21:44:45.484161 #50185] DEBUG -- : CACHE (0.0ms) SELECT "rewardtypes".* FROM "rewardtypes" WHERE "rewardtypes"."id" = ? LIMIT 1 [["id", 3]]
D, [2016-01-28T21:44:45.484191 #50185] DEBUG -- : CACHE (0.0ms) SELECT "rewardtypes".* FROM "rewardtypes" WHERE "rewardtypes"."id" = ? LIMIT 1 [["id", 3]]
D, [2016-01-28T21:44:45.484953 #50185] DEBUG -- : (0.1ms) SELECT COUNT("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 57]]
D, [2016-01-28T21:44:45.484984 #50185] DEBUG -- : (0.1ms) SELECT COUNT("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 57]]
D, [2016-01-28T21:44:45.485425 #50185] DEBUG -- : (0.1ms) SELECT SUM("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 57]]
D, [2016-01-28T21:44:45.485451 #50185] DEBUG -- : (0.1ms) SELECT SUM("investments"."amount") FROM "investments" WHERE "investments"."reward_id" = ? [[nil, 57]]
I, [2016-01-28T21:44:45.486265 #50185] INFO -- : Rendered projects/_proj_investments.html.erb (93.5ms)
I, [2016-01-28T21:44:45.486298 #50185] INFO -- : Rendered projects/_proj_investments.html.erb (93.5ms)
I, [2016-01-28T21:44:45.486347 #50185] INFO -- : Rendered projects/show.html.erb within layouts/application (123.7ms)
I, [2016-01-28T21:44:45.486419 #50185] INFO -- : Rendered projects/show.html.erb within layouts/application (123.7ms)
I, [2016-01-28T21:44:46.135983 #50185] INFO -- : Rendered layouts/_header.html.erb (1.0ms)
I, [2016-01-28T21:44:46.136035 #50185] INFO -- : Rendered layouts/_header.html.erb (1.0ms)
I, [2016-01-28T21:44:46.136408 #50185] INFO -- : Completed 200 OK in 809ms (Views: 778.2ms | ActiveRecord: 3.3ms)
I, [2016-01-28T21:44:46.136454 #50185] INFO -- : Completed 200 OK in 809ms (Views: 778.2ms | ActiveRecord: 3.3ms)
D, [2016-01-28T21:44:58.979348 #50185] DEBUG -- :
D, [2016-01-28T21:44:58.979399 #50185] DEBUG -- :
D, [2016-01-28T21:44:58.979420 #50185] DEBUG -- :
D, [2016-01-28T21:44:58.979434 #50185] DEBUG -- :
I, [2016-01-28T21:44:58.979548 #50185] INFO -- : Started POST "/investments" for ::1 at 2016-01-28 21:44:58 -0800
I, [2016-01-28T21:44:58.979579 #50185] INFO -- : Started POST "/investments" for ::1 at 2016-01-28 21:44:58 -0800
I, [2016-01-28T21:44:58.986293 #50185] INFO -- : Processing by InvestmentsController#create as JS
I, [2016-01-28T21:44:58.986368 #50185] INFO -- : Processing by InvestmentsController#create as JS
I, [2016-01-28T21:44:58.986441 #50185] INFO -- : Parameters: "utf8"=>"✓", "investment"=>"amount"=>"50", "User_id"=>"2", "Reward_id"=>"50", "commit"=>"INVEST"
I, [2016-01-28T21:44:58.986457 #50185] INFO -- : Parameters: "utf8"=>"✓", "investment"=>"amount"=>"50", "User_id"=>"2", "Reward_id"=>"50", "commit"=>"INVEST"
D, [2016-01-28T21:44:58.987691 #50185] DEBUG -- : (0.1ms) begin transaction
D, [2016-01-28T21:44:58.987725 #50185] DEBUG -- : (0.1ms) begin transaction
D, [2016-01-28T21:44:58.991624 #50185] DEBUG -- : SQL (0.4ms) INSERT INTO "investments" ("User_id", "Reward_id", "amount", "created_at", "updated_at") VALUES (?, ?, ?, ?, ?) [["User_id", 2], ["Reward_id", 50], ["amount", 50.0], ["created_at", "2016-01-29 05:44:58.990349"], ["updated_at", "2016-01-29 05:44:58.990349"]]
D, [2016-01-28T21:44:58.991667 #50185] DEBUG -- : SQL (0.4ms) INSERT INTO "investments" ("User_id", "Reward_id", "amount", "created_at", "updated_at") VALUES (?, ?, ?, ?, ?) [["User_id", 2], ["Reward_id", 50], ["amount", 50.0], ["created_at", "2016-01-29 05:44:58.990349"], ["updated_at", "2016-01-29 05:44:58.990349"]]
D, [2016-01-28T21:44:58.992612 #50185] DEBUG -- : (0.6ms) commit transaction
D, [2016-01-28T21:44:58.992677 #50185] DEBUG -- : (0.6ms) commit transaction
I, [2016-01-28T21:44:59.002803 #50185] INFO -- : Rendered projects/_proj_investments.html.erb (3.3ms)
I, [2016-01-28T21:44:59.002882 #50185] INFO -- : Rendered projects/_proj_investments.html.erb (3.3ms)
I, [2016-01-28T21:44:59.002941 #50185] INFO -- : Rendered investments/create.js.erb (4.6ms)
I, [2016-01-28T21:44:59.002974 #50185] INFO -- : Rendered investments/create.js.erb (4.6ms)
I, [2016-01-28T21:44:59.003170 #50185] INFO -- : Completed 500 Internal Server Error in 17ms (ActiveRecord: 1.1ms)
I, [2016-01-28T21:44:59.003204 #50185] INFO -- : Completed 500 Internal Server Error in 17ms (ActiveRecord: 1.1ms)
F, [2016-01-28T21:44:59.004536 #50185] FATAL -- :
ActionView::Template::Error (undefined method `investments' for nil:NilClass):
1: <div class="panel panel-default project-rightpanel">
2: <div class="project-rightpanel-header">
3: <span class="project-rightpanel-header amount"><%=number_to_currency(@project.investments.sum(:amount),precision: 0)%></span> of <span class="project-rightpanel-header amount">$20,000</span> raised in 15 days
4: </div>
5: <div id="projectprogress"></div>
6: <div class="project-rightpanel-header">
app/views/projects/_proj_investments.html.erb:3:in `_app_views_projects__proj_investments_html_erb__2910721485294471226_70328031908000'
app/views/investments/create.js.erb:1:in `_app_views_investments_create_js_erb__4066473719869479756_70328057899160'
F, [2016-01-28T21:44:59.004591 #50185] FATAL -- :
ActionView::Template::Error（未定义方法investments' for nil:NilClass):
1: <div class="panel panel-default project-rightpanel">
2: <div class="project-rightpanel-header">
3: <span class="project-rightpanel-header amount"><%=number_to_currency(@project.investments.sum(:amount),precision: 0)%></span> of <span class="project-rightpanel-header amount">$20,000</span> raised in 15 days
4: </div>
5: <div id="projectprogress"></div>
6: <div class="project-rightpanel-header">
app/views/projects/_proj_investments.html.erb:3:in_app_views_projects__proj_investments_html_erb__2910721485294471226_70328031908000'
app/views/investments/create.js.erb:1:in `_app_views_investments_create_js_erb__4066473719869479756_70328057899160'
I, [2016-01-28T21:44:59.114304 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_dispatch/middleware/templates/rescues/_trace.text.erb (0.5ms)
I, [2016-01-28T21:44:59.114355 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_dispatch/middleware/templates/rescues/_trace.text.erb (0.5ms)
I, [2016-01-28T21:44:59.126017 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_dispatch/middleware/templates/rescues/_request_and_response.text.erb (0.6ms)
I, [2016-01-28T21:44:59.126055 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_dispatch/middleware/templates/rescues/_request_and_response.text.erb (0.6ms)
I, [2016-01-28T21:44:59.126101 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_dispatch/middleware/templates/rescues/template_error.text.erb (24.6ms)
I, [2016-01-28T21:44:59.126152 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_dispatch/middleware/templates/rescues/template_error.text.erb (24.6ms)
I, [2016-01-28T21:44:59.144002 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/_markup.html.erb (0.3ms)
I, [2016-01-28T21:44:59.144052 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/_markup.html.erb (0.3ms)
I, [2016-01-28T21:44:59.166877 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string (0.3ms)
I, [2016-01-28T21:44:59.166935 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string (0.3ms)
I, [2016-01-28T21:44:59.177608 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string (0.2ms)
I, [2016-01-28T21:44:59.177656 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string (0.2ms)
I, [2016-01-28T21:44:59.187782 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/style.css.erb within layouts/inlined_string (0.3ms)
I, [2016-01-28T21:44:59.187836 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/style.css.erb within layouts/inlined_string (0.3ms)
I, [2016-01-28T21:44:59.188232 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/console.js.erb within layouts/javascript (33.9ms)
I, [2016-01-28T21:44:59.188272 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/console.js.erb within layouts/javascript (33.9ms)
I, [2016-01-28T21:44:59.198215 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/main.js.erb within layouts/javascript (0.2ms)
I, [2016-01-28T21:44:59.198255 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/main.js.erb within layouts/javascript (0.2ms)
I, [2016-01-28T21:44:59.209355 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/error_page.js.erb within layouts/javascript (0.4ms)
I, [2016-01-28T21:44:59.209420 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/error_page.js.erb within layouts/javascript (0.4ms)
I, [2016-01-28T21:44:59.210343 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/index.html.erb (74.6ms)
I, [2016-01-28T21:44:59.210453 #50185] INFO -- : Rendered /Users/mikelincoln/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/index.html.erb (74.6ms)
【问题讨论】：
你的代码有问题。但在此之前，你能告诉我们你在 Rails 日志文件中得到的错误堆栈跟踪吗？ Arup - 我放入了完整的堆栈跟踪（可能比您所寻找的更详细）。我希望它有所帮助，并感谢任何想法或想法。 感谢 Arup .. 我已经编辑了我的原始帖子以包含模型 【参考方案1】：您的错误是 <%=number_to_currency(@project.investments.sum(:amount),precision: 0) 。当您从 create.js.erb 渲染部分时，没有为 ivar @project 分配值，这就是它是 nil 的原因。你需要给它赋值。
错误回溯的修复看起来像：
def create
@investment = Investment.new(investment_params)
respond_to do |format|
if @investment.save
@project = @investment.reload.project
format.js
format.html redirect_to @investment, notice: 'Investment was successfully created.'
format.json render :show, status: :created, location: @investment
else
format.html render :new
format.json render json: @investment.errors, status: :unprocessable_entity
end
end
【讨论】：
感谢奥雅纳。我试过了，它说'project'有一个未定义的方法......错误如下......有什么想法吗？ F，[2016-01-29T06:31:10.509297 #50185] 致命 -- ：NoMethodError（未定义方法project' for #<Investment:0x007fed1152c7a8>): app/controllers/investments_controller.rb:32:in block in create' app/controllers/investments_controller.rb:29:in `创建'
@MikeL 你能分享你的那两个模型吗？您似乎没有正确配置关联。
嗨 Arup .. 我在原帖中分享了模型。谢谢！
Arup - 不用担心。感谢大家的帮助！【参考方案2】：
补充Arup的回答，报错如下：
ActionView::Template::Error（nil:NilClass 的未定义方法“投资”）：
<%= number_to_currency(@project.investments.sum(:amount),precision: 0) %>
问题是您没有定义@project（如上所述）。
解决方案是确保create 操作填充@project。
实现这一目标的最佳方式是使用nested resources 为项目创建投资：
#config/routes.rb
resources :projects do
resources :investments, only: :create #-> url.com/projects/:project_id/investments
end
#app/controllers/projects_controller.rb
def create
@project = Project.find params[:project_id]
@investment = @project.investments.new investment_params
对于investments#new 方法（您尚未共享），您必须使用以下内容：
<%= form_for [@project, @investment] do |f| %>
IE - 路由每个investments#create通过一个对应的project
【讨论】：
有钱 - 你就是男人。我有一段时间难以理解这一点（并且仍然在概念上有点挣扎），但是当我看到它神奇地工作时，它让我很开心。唯一的问题是：似乎我现在已经在我的 projects_controller.rb 文件的 create 方法中覆盖了构建新项目的逻辑。我曾经在“@project = current_user.projects.build(project_params)”中有一行，我怎样才能让这个和我的核心项目创建表单共存？ 你是什么意思？很高兴它成功了，但我不明白你说的新问题已经创建？ 嗯，有一个单独的表单用于创建一个新项目，但它也调用了 Projects 控制器中的 Create 方法。但是，为了让你们帮助的上述功能发挥作用，我不得不注释掉完全从头开始构建一个新项目的行。那行是：@project = current_user.projects.build(project_params)。现在，我在其中有“@project= Project.find params[:project_id”] 行，当我从头开始创建新项目时，它会引发“找不到带有 'id'= 的项目”错误。我想我可以创建 2 个单独的方法？以上是关于使用 AJAX 刷新 Rails 部分时的未定义方法的主要内容，如果未能解决你的问题，请参考以下文章
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