Rails ActionMailer错误未定义电子邮件
[英]Rails ActionMailer error undefined email
问题描述
Beginner rails error I'm trying to send emails out to ALL current users when an article is updated. 
初学者Rails错误我正在尝试在文章更新时向所有当前用户发送电子邮件。
I have sendgrid and devise set up with my app and am able to get the mailer to work through rails console. 我已经使用我的应用程序设置了sendgrid并设计了它，并且能够使邮件程序通过Rails控制台工作。 But, for some reason, I receive an undefined method email for #<User::ActiveRecord_Relation:0x007f8685aebec0> when updating an article. 但是，由于某种原因，在更新文章时，我收到undefined method email for #<User::ActiveRecord_Relation:0x007f8685aebec0>的undefined method email for #<User::ActiveRecord_Relation:0x007f8685aebec0> 。
ArticleNotificationMailer ArticleNotificationMailer
class ArticleNotificationMailer < ApplicationMailer
default from: 'you@example.com'
def new_article(user, article)
@user = user
@article = article
mail(
to: @user.email,
subject: "New update to article #{article.title}"
)
end
end
new_article.html.erb new_article.html.erb
<!DOCTYPE html>
<html>
<head>
<meta content="text/html; charset=UTF-8" http-equiv="Content-type" />
</head>
<body>
<h1>New article on website "<%= @article.title %>"</h1>
<p>
<%= @article.body %>
</p>
<p>
<%= link_to "View Comment on site", article_url(@article, anchor: "updates=#{@article.id}") %>
</p>
</body>
</html>
ArticleController I'm using ArticleNotificationMailer.new_article(@user, @article).deliver ArticleController我使用ArticleNotificationMailer.new_article(@user, @article).deliver
def update
respond_to do |format|
if @article.update(article_params)
ArticleNotificationMailer.new_article(@user, @article).deliver
format.html { redirect_to @article, notice: 'Article was successfully updated.' }
format.json { render :show, status: :ok, location: @article }
else
format.html { render :edit }
format.json { render json: @article.errors, status: :unprocessable_entity }
end
end
end
Error Message 错误信息
NoMethodError in ArticlesController#update
undefined method `email' for #<User::ActiveRecord_Relation:0x007f8685aebec0>
mail(
to: @user.email,
subject: "New post to articles #{article.title}"
)
end
Rails Console Rails控制台
>> u = User.last
>> a = Article.first
>> ActionNotificationMailer.new_article(u, a).deliver_now
3 个解决方案
解决方案1
1 2016-03-02 23:44:28
ArticleNotificationMailer.new_article(@user, @article).deliver
Seems like @user was initialized by User.where() in your controller. 好像@user是由控制器中的User.where（）初始化的。 User.where returns an instance of User::ActiveRecord_Relation which is in fact rails-enhanced array. User.where返回User :: ActiveRecord_Relation的实例，该实例实际上是rails增强的数组。 And errors comes up when you are trying to call email on this array. 当您尝试在此阵列上调用电子邮件时，会出现错误。
Just use User.find if you need to find only one record. 如果只需要查找一条记录，只需使用User.find即可。
解决方案2
0 2016-03-02 23:47:15
Try passing in the id of the elements. 尝试传递元素的ID。
class ArticleNotificationMailer < ApplicationMailer
default from: 'you@example.com'
def new_article(user_id, article_id)
@user = User.where(id: user_id)
@article = Article.where(id: article_id)
mail(
to: @user.email,
subject: "New update to article #{article.title}"
)
end
end
In your console
>> u = User.last
>> a = Article.first
>> ActionNotificationMailer.new_article(u.id, a.id).deliver_now
解决方案3
0 已采纳 2016-03-03 00:50:26
I figured out how to fix this. 我想出了解决方法。
I added the code below to article.rb and added @article.send_notifications! 我将以下代码添加到article.rb，并添加了@ article.send_notifications！ to my update controller. 到我的更新控制器。
def send_notifications!
user = User.all
user.each do |user|
ArticleNotificationMailer.new_article(user, self).deliver_now
end
end
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