Trying to create a new method in rails and getting a nomethoderror undefined method

  def create 
    msg = current_user.msgs.build(params[:msg])
    msg.message = msg.message[0..140]
    msg.created_at = Time.now # HACK
    if msg.save
    else
      flash[:error] = "Your article must contain some text."
    end
    redirect_to root_path
  end

I want to add something like

msg.title = msg.title
msg.byline = msg.byline

So that I can have a title and byline associated with each message, but if I do I get the error

   NoMethodError in Home#index

   Showing /Users/fred/Desktop/demosite/app/views/home/index.html.erb where line #25 raised:

   undefined method `title' for #<msg:0x00000104dbcn90>

How do I add title and byline so that I do开发者_如何学Pythonnt get nomethoderrors? Thanks

---

First of all: what?

msg = current_user.msgs.build(params[:msg])
msg.message = msg.message[0..140]
msg.created_at = Time.now # HACK

This confuses us. Why would you:

1) Limit the message length in the controller and not as a before_save on the model?

before_save :only_140_characters

def only_140_characters
  self.message = self.message[0..140]
end

2) Set created_at yourself in the controller? This is taken care of by Rails automatically. When a record is created, the created_at field will be set to a value by ActiveRecord. Similarly, when you update a record updated_at will be set to the current time as well. Rails will only do this if your fields actually exist.

---

Now on to the real question: Why are you getting that undefined method error?

apneadiving points out correctly in the comments you need to add a migration to add that column to the messages table. You can do this by running this command:

rails g migration add_title_to_messages title:string

Then by running rake db:migrate will that column be added to the messages table in the database. Keep in mind that you'll need to run RAILS_ENV=production rake db:migrate to add it to your production database too, if you are at that point.