Ruby on Rails form helper - mysql

Question

I am very new to Rails and have been having some trouble trying to find tutorials that actually work for me. I am attempting to create a database in MySQL and then allow users to submit information to this database through a form. I was able to create a form using the code below but it only triggers the new method in the Controller and not the create method. Does anyone know why this is happening and/or can guide me to a good tutorial for building forms. I have found some in google but for some reason the syntax never works for me when I try to enter it. Thank you very much in advance for any help you can give.
Controller -
class MessageController < ApplicationController
def new
#message = Message.new
end
def create
#message = Message.new
#message.message=params[:mess]
#message.user=params[:name]
if #message.save
redirect_to "http://itworks.com"
end
end
end
View -
<%= form_for :MessageController do |f| -%>
Message: <%= f.text_field :mess %><br />
UserName: <%= f.text_field :name %><br />
<%= f.submit%>
<% end -%>
Edit - When I change :MessageController to #message or :message I get a syntax error. (syntax error, unexpected keyword ensure, expecting $end. Surprisingly enough the form works with :MessageController but it only triggers the new method not the create method.

Answer 1

form_for expects either an instance of a model, or a symbol representing the name of a variable containing an instance of a model. You've given it the name of a controller.
Use this:
<%= form_for :message do |f| -%>
or thiS:
<%= form_for #message do |f| -%>

Answer 2

Since you're new, let me explain some things for you:
--
form_for
<%= form_for #message do |f| -%>
<%= f.label :mess %>
<%= f.text_field :mess %>
<%= f.label :name %>
<%= f.text_field :name %>
<%= f.submit %>
<% end %>
When you use form_for, you basically need to populate it with an ActiveRecord object. Currently, you're using the MessageController class, which is totally wrong. You've already set the #message object in your controller - you just need to populate your form_for method with it
--
Strong Params
Secondly, as I already mentioned in your other question, you need to ensure you're using the strong params functionality of Rails correctly:
#app/controllers/message_controller.rb
Class MessageController < ApplicationController
def create
#message = Message.new(message_params)
#message.save
end
private
def message_params
params.require(:message).permit(:mess, :user)
end
end

Answer 3

I'm still pretty new to Rails as well, but it looks like your syntax for the form_for method is off a bit. Here's the example from the rails guide for form helpers:
<%= form_for #article, url: {action: "create"}, html: {class: "nifty_form"} do |f| %>
<%= f.text_field :title %>
<%= f.text_area :body, size: "60x12" %>
<%= f.submit "Create" %>
<% end %>
And here's the link to the form helper page: http://guides.rubyonrails.org/form_helpers.html
I've found the rubyonrails.org guides to be the best resource for trouble-shooting. The documentation is actually quite good(both extensive and clear).

Answer 4

I guess that maybe caused by the "Strong parameter",
to learn more you can see Strong Parameters by Example here.
In the Messages controller, we could add the strong parameter to it
class MessageController < ApplicationController
def new
#message = Message.new
end
def create
#message = Message.new(message_params)
#message.message=params[:mess]
#message.user=params[:name]
if #message.save
redirect_to "http://itworks.com"
end
end
private
def message_params
params.require(:message).permit(:mess, :name)
end
end
Because you define the #message , so..why not use it?
<%= form_for #message do |f| %>
Message: <%= f.text_field :mess %><br />
UserName: <%= f.text_field :name %><br />
<%= f.submit%>
<% end %>