使用 Ruby on Rails 在文本区域保留换行符 [英] Preserve newline in text area with Ruby on Rails

问题描述

为了练习 Ruby on Rails，我创建了一个包含文本区域的博客(遵循 Mackenzie Child 的教程).提交文本后，所有换行符都将被删除.我知道已经有人问过这个问题的变体，但是尽管尝试了一整天，我还是无法复制任何结果.我对 JQuery 不是很熟悉.

是否有一组步骤可以保留换行符?

_form.html.erb

<%= form_for @post do |f|％＞<%= f.label :title %><br><%= f.text_field :title %><br><br><%= f.label :body %><br><%= f.text_area :body %><br><br><%= f.submit %><%结束%>

posts_controller.rb

class PostsController 

解决方案

实际上保留了换行符(如 \r\n)，只是在索引/显示视图中看不到它们.

在这些视图中，调用 simple_formatpost.body 字段将 \ns 替换为
s(HTML 换行符):

simple_format(post.body)

来自文档:

simple_format(text, html_options = {}, options = {}) public返回使用简单格式规则转换为 HTML 的文本.两个或多个连续换行符(\n\n)被视为一个段落并换行在<p>标签.一个换行符 (\n) 被视为换行符，而 <br/>标签是附加.此方法不会从文本中删除换行符.

To practice Ruby on Rails, I am creating a blog which includes a text area (following Mackenzie Child's tutorial). When the text is submitted, all of the newlines are removed. I know variations of the question have been asked already, but I have been unable to replicate any of the results despite an entire day trying. I am not very familiar with JQuery.

Is there a set of steps that will preserve the newlines?

_form.html.erb

<div class="form">
    <%= form_for @post do |f| %>
        <%= f.label :title %><br>
        <%= f.text_field :title %><br>
        <br>
        <%= f.label :body %><br>
        <%= f.text_area :body %><br>
        <br>
        <%= f.submit %>
    <% end %>
</div>

posts_controller.rb

class PostsController < ApplicationController before_action :authenticate_user!, except: [:index, :show]

def index
    @posts = Post.all.order('created_at DESC')
end

def new
    @post = Post.new
end

def create
    @post = Post.new(post_params)

    @post.save
    redirect_to @post
end

def show
    @post = Post.find(params[:id])
end

def edit
    @post = Post.find(params[:id])
end

def update
    @post = Post.find(params[:id])

    if @post.update(params[:post].permit(:title, :body))
        redirect_to @post
    else
        render 'edit'
    end
end

def destroy
    @post = Post.find(params[:id])
    @post.destroy

    redirect_to posts_path
end

private

    def post_params
        params.require(:post).permit(:title, :body)
    end
end

解决方案

Newlines are actually being preserved(as \r\n), you just don't see them in your index/show views.

In these views, call simple_format on your post.body field to replace \ns with <br>s(HTML newlines):

simple_format(post.body)

From docs:

simple_format(text, html_options = {}, options = {}) public

Returns text transformed into HTML using simple formatting rules.
Two or more consecutive newlines(\n\n) are considered as a paragraph and wrapped 
in <p> tags. One newline (\n) is considered as a linebreak and a <br /> tag is 
appended. This method does not remove the newlines from the text.

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