Preserve newline in text area with Ruby on Rails

问题

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

回答1:

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.

来源：https://stackoverflow.com/questions/28397943/preserve-newline-in-text-area-with-ruby-on-rails

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