未定義的方法`strftime的」爲無：NilClass - 評論日期

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我顯示當評論發佈日期：未定義的方法`strftime的」爲無：NilClass - 評論日期

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

這工作，但如果註釋沒有正確填寫，提交。如果發生這種情況，我得到錯誤：undefined method strftime'爲nil：NilClass`而不是我的評論驗證。

如何解決這個問題，我不確定？

這裏是我的代碼：

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>

來源

2016-08-26 bgilbank

能否詳細說一下「f評論沒有正確提交，並提交」？這些評論如何創建？他們如何堅持你的數據庫？ – kiddorails

試試這個，comment.created_at.strftime（「％d％b％Y」）if comment.created_at.present？ – Navin

@bgilbank，您可以在註釋未正確創建時解釋上下文嗎？如果評論中的驗證通過，評論記錄中的'created_at'和'updated_at'字段將自動填充。即。如果評論存在，您可以顯示'created_at'字段。在你看來，'comment'看起來是'nil'。試着找出爲什麼它的零。 –

我想你還沒有填充局部變量評論正常。試試這個，

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

來源

2016-08-29 06:02:37 Navin

未定義的方法`strftime的」爲無：NilClass - 評論日期

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