未定義のメソッド `strftimeの」：NilClass - コメント日

Question

コメントが公開されたとき、私は日付を表示しています：

<%= comment.created_at.strftime("%d %b %Y") %> 

これは、コメントが正しく記入されていない、と提出された場合を除き、動作します。これが発生した場合、私はエラーが発生します：undefined method strftime 'for nil：NilClass`は私のコメントの検証ではなく。

これを修正するにはどうすればよいですか？私はあなたが適切にローカル変数コメントを埋めていないと思います

class CommentsController < ApplicationController 

def create 
    @post = Post.friendly.find(params[:post_id]) 
    @comment = @post.comments.create(params[:comment].permit(:name, `:email, :website, :body, :url))` 


    if @comment.errors.any? 
    render "posts/show" 
else 
    redirect_to post_path(@post) 
    end 
end 


def destroy 
    @post = Post.friendly.find(params[:post_id]) 
    @comment = @post.comments.find(params[:id]) 
    @comment.destroy 

    redirect_to post_path(@post) 

    end 


end 




class Comment < ActiveRecord::Base 


belongs_to :post 

validates_format_of :email, :with => /@/ 
validates :name, presence: true, length: { minimum: 5} 
validates :body, presence: true, length: { minimum: 5} 
validates :body, presence: true, length: { minimum: 5} 


def gravatar_url 
    stripped_email = email.strip 
    downcased_email = stripped_email.downcase 
    hash = Digest::MD5.hexdigest(downcased_email) 
    default_url = "https://s3-us-west-2.amazonaws.com/mirror-communications/assets/download.jpg" 

    "http://gravatar.com/avatar/#{hash}" 
end 


end 


<!-- Post Comments Partial --> 
<li>          
       <article class="comment">           
       <div class="user-avatar">            
       <%= image_tag comment.gravatar_url %>             
       </div> 
       <div class="comment-content"> 
       <h5 class="name"><%= comment.name %></h5> 
       <div class="comment-meta comment-reply"> 
       <span class="post-date"><%= comment.created_at.strftime("%d %b %Y") %></span>/<span class="comment-reply-link"><%= link_to comment.website.try(:remove, /.*\/\//), url_for(comment.website), target: '_blank', class: "comment-reply" %></span> 
       </div> 
       <p><%= comment.body %></p> 
       </div> 
       </article> 

<!-- Form Partial --> 
<%= form_for([@post, @post.comments.build]) do |f| %> 

<% if @comment && @comment.errors.any? %> 
    <div id="error_explanation" class="alert alert-danger alert-dismissable"> 
    <button type="button" class="close" data-dismiss="alert" aria-hidden="true">&times;</button> 
     <h2><%= pluralize(@comment.errors.count, "error") %> Your comment could not be submitted:</h2> 
    <ul> 
    <% @comment.errors.full_messages.each do |message| %> 
    <li><%= message %></li> 
    <% end %> 
    </ul> 
</div> 

<form class="comment-form"> 
<div class="row"> 
<div class="column width-4"> 
    <%= f.text_field :name, class: "form-name form-element", placeholder: "Name*", :tabindex => 1 %> 
</div> 

<div class="column width-4"> 
<%= f.email_field :email, class: "form-email form-element", placeholder: "Email* (not displayed)", :tabindex => 3 %> 
</div> 

<div class="column width-4"> 
    <%= f.url_field :website, class: "form-website form-element", placeholder: "Website", :tabindex => 4 %> 
</div> 
</div> 


    <div class="row"> 
    <div class="column width-12"> 
    <%= f.text_area :body, class: "form-message form-element", placeholder: "Message*", :tabindex => 5 %> 


    <%= f.submit class: "form-submit button medium bkg-black bkg-hover-turquoise color-white color-hover-white no-margin-bottom" %> 

</div> 
</div> 
</form> 
</div> 

<% end %> 

<!-- Posts Show -->` 

    <div class="post-comments"> 
    <h3 class="comments-title"> 
    <% if @post.comments.count < 2 %> 
    <%= @post.comments.count %> Comment</h3> 
    <% else %> 
    <%= @post.comments.count %> Comments</h3> 
    <% end %> 
    <div class="comments"> 
    <ul class="comment-list"> 

    <%= render @post.comments %> 
    </ul> 
    </div> 
    </div> 

Answer 1

：

は、ここに私のコードです。 これを試してみてください

comment.created_at.strftime("%d %b %Y") if comment and comment.created_at