ruby-on-rails - 使用 Ruby on Rails 在文本区域中保留换行符

Question

为了练习 Ruby on Rails，我正在创建一个包含文本区域的博客(遵循 Mackenzie Child 的教程)。提交文本时，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

<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

Answer 1

换行符实际上被保留(如 \r\n )，您只是在索引/显示 View 中看不到它们。

在这些 View 中，调用 simple_format 在你的 post.body要替换的字段 \n与 <br> s(HTML 换行符):

simple_format(post.body)

来自文档:

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.