Question

Use a hidden field will fix my issue… i got it..

Hi All,

I am new to rails, trying to do some practice.
The app i am writing is trying to create a new “Post” See the view and controller below.

But it doesn`t work as what i expected…
the parameters pass to function “save”, there is no “post_at” field…

How can i fix it???
Thanks

INFO:   Parameters: {"authenticity_token"=>"Xc9VuvRL6GsUTaKyyNQxp8ovylEYwOMC+7hMcqdKizg=", "post"=>{"title"=>"First post", "content"=>"Write something"}, "commit"=>"save"}

View new_post.erb

<div class="post">
  <% form_for @new_post, :url => { :action => "save" } do |f| %>
    <p><%= f.error_messages %></p>
    <br/>
    <table>
      <tr>
        <td>Title</td>
        <td><%= f.text_field :title %></td>
      </tr>
      <tr>
        <td>Post at</td>
        <td><%= @new_post.post_at %></td>
      </tr>
      <tr>
        <td>Message</td>
        <td><%= f.text_area :content, :cols => 100, :rows => 10 %></td>
      </tr>
    </table>
    <br/>
    <%= f.submit 'save'%>
  <% end %>
</div>

Post Controler

class PostController < ApplicationController
  def index
    @all_posts = Post.find(:all)

    render :action => "post"
  end

  def new
    @new_post = Post.new
    @new_post.post_at = Time.now

    render :action => "new_post"
  end

  def save
    @new_post = params[:post]
    Post.create(@new_post)

    redirect_to "/post"
  end
end

Data Model:

class Post
  include DataMapper::Resource
  storage_names[:default] = "Post"

  property :id,      Serial
  timestamps :at

  property :title,        String,        :required => true, :length => 500
  property :content,      Text,          :required => true, :lazy => false
  property :post_at,      DateTime
end

Answer 1

First off, your development will be a lot easier if you follow the REST principles.

Your controller should instead of save implement the create and update methods.

def index
  @posts = Post.all
end

def new
  @post = Post.new
end

def create
  @post = Post.create(params[:post])
  redirect_to @post
end

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

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

def update
  @post = Post.get(params[:id])
  @post.update_attributes(params[:post])
  redirect_to @post
end

def destroy
  @post = Post.get(params[:id])
  @post.destroy
  redirect_to posts_path
end

This is a complete REST controller which has the views index.html.erb, new.html.erb, edit.html.erb, show.html.erb all in app/views/posts.

Sidenote: If you’re new to Rails, it might be a good idea to learn how to use it with ActiveRecord before trying on DataMapper. That way you can use rails generate scaffold to get a full example of a way to do all this.