如何将form_for帮助器中的局部变量传递给js文件?
我有以下名为_subscribe.html.erb的文件
<%= form_for @subscription, :url => {:controller => "subscriptions", :action => "create"} do |f| %>
<div><%= hidden_field_tag :group_id, group.id %></div>
<%= f.submit "Subscribe", class: "btn btn-primary subscribe_btn" %>
<% end %>
组局部变量从do块传递到此形式并且可以正常工作(直到现在为止只有html)。我想把它变成一个ajax调用,所以我将remote: true
添加到表单并将文件create.js.erb添加到subscriptions文件夹中:
$("#new_subscription").html("<%= escape_javascript(render('subscriptions/unsubscribe', locals: { group: group } )) %>")
这是我的订阅控制器创建操作:
def create
@subscription = current_user.subscriptions.create(:group_id => params[:group_id])
@subscription.save
respond_to do |format|
format.html { redirect_to groups_path, flash[:success] = "You have successfully subscribed to this group" }
format.js
end
end
但是现在我收到了这个错误:
ActionView::Template::Error (undefined local variable or method `group' for #<#<Class:0x007fe7ecfd4950>:0x007fe7ecfde7e8>):
1: $("#new_subscription").html("<%= escape_javascript(render('subscriptions/unsubscribe', locals: { group: group } )) %>")
app/views/subscriptions/create.js.erb:1:in `_app_views_subscriptions_create_js_erb__3184685282411376061_70317032458920'
app/controllers/subscriptions_controller.rb:8:in `create'
在提交时,组本地变量未从form_for传递给create.js.erb。我在过去的4个小时里尝试过所有的东西,但我仍然很短。如何解决此问题并将局部变量从_subscribe.html.erb partial传递给create.js.erb文件?
编辑:
更多代码...首先我的订阅控制器创建操作:
def create
@group = Group.find(params[:group_id])
@subscription = current_user.subscriptions.create(:group_id => @group.id)
@subscription.save
respond_to do |format|
format.html { redirect_to groups_path }
format.js
end
end
并销毁行动:
def destroy
@group = Group.find(params[:id])
@subscription = current_user.subscriptions.find_by(group_id: @group.id)
@subscription.destroy
respond_to do |format|
format.html { redirect_to groups_path }
format.js
end
end
&安培; create.js.erb
$("#subscribe_button").html("<%= escape_javascript(render('subscriptions/unsubscribe', locals: { group: @group } )) %>")
&安培; destory.js.erb
$("#unsubscribe_button").html("<%= escape_javascript(render('subscriptions/subscribe', locals: { group: @group } )) %>")
我仍然在日志中收到以下错误:
Started POST "/subscriptions" for 127.0.0.1 at 2014-11-20 22:23:39 +0000
Processing by SubscriptionsController#create as JS
Parameters: {"utf8"=>"✓", "group_id"=>"1", "commit"=>"Subscribe"}
User Load (0.9ms) SELECT "users".* FROM "users" WHERE "users"."remember_token" = 'b0afd34150d0c021a1e4d0dfa357107a2aa59f00' LIMIT 1
Group Load (0.4ms) SELECT "groups".* FROM "groups" WHERE "groups"."id" = $1 LIMIT 1 [["id", "1"]]
(0.2ms) BEGIN
Subscription Exists (0.6ms) SELECT 1 AS one FROM "subscriptions" WHERE ("subscriptions"."group_id" = 1 AND "subscriptions"."user_id" = 2) LIMIT 1
SQL (0.6ms) INSERT INTO "subscriptions" ("created_at", "group_id", "role", "updated_at", "user_id") VALUES ($1, $2, $3, $4, $5) RETURNING "id" [["created_at", Thu, 20 Nov 2014 22:23:39 UTC +00:00], ["group_id", 1], ["role", "pending"], ["updated_at", Thu, 20 Nov 2014 22:23:39 UTC +00:00], ["user_id", 2]]
(0.4ms) COMMIT
(0.1ms) BEGIN
Subscription Exists (0.7ms) SELECT 1 AS one FROM "subscriptions" WHERE ("subscriptions"."group_id" = 1 AND "subscriptions"."id" != 96 AND "subscriptions"."user_id" = 2) LIMIT 1
(0.2ms) COMMIT
Rendered subscriptions/_unsubscribe.html.erb (100.3ms)
Rendered subscriptions/create.js.erb (101.7ms)
Completed 500 Internal Server Error in 120ms
ActionView::Template::Error (undefined local variable or method `group' for #<#<Class:0x007fdc05a244a8>:0x007fdc0545b350>):
1: <%= debug group %>
2: <div id="unsubscribe_button">
3: <%= button_to "Unsubscribe", subscription_path(group), :remote => true, :method => 'delete', class: "btn subscribe_btn" %>
4: </div>
app/views/subscriptions/_unsubscribe.html.erb:1:in `_app_views_subscriptions__unsubscribe_html_erb__4479900334468069300_70291478478720'
app/views/subscriptions/create.js.erb:1:in `_app_views_subscriptions_create_js_erb__1667797080065562395_70291478425360'
app/controllers/subscriptions_controller.rb:8:in `create'
您可以清楚地看到@group已在create action中设置并且已成功创建订阅但未在js.erb文件中设置本地变量。
答案 0 :(得分:7)
你不是。当前请求结束时,即表单被呈现时,执行结束。在提交表单之前,不会调用.js.erb视图模板,从而启动新请求。
您必须创建一个实例变量,例如控制器中的@group = however_you_get_the_group
创建操作以使其对.js.erb视图可见,并且如此引用:locals: { group: @group }
答案 1 :(得分:3)
问题在于,当您处于create
操作时,您没有在上一个操作中设置的变量。
因此,您需要再次设置@group
实例变量,然后在create.js.erb
模板中使用它。
def create
@group = Group.find(params[:group_id])
@subscription = current_user.subscriptions.create(:group_id => @group.id)
@subscription.save
respond_to do |format|
format.html { redirect_to groups_path, flash[:success] = "You have successfully subscribed to this group" }
format.js
end
end
$("#new_subscription").html("<%= escape_javascript(render('subscriptions/unsubscribe', locals: { group: @group } )) %>")