form_for doesn't submit fields to database - ruby-on-rails

Question

I've searched and searched and nothing came up, so I need to ask you guys for help.
I have a simple new form that should take two fields from form_for and then post it into database. The problem is it doesn't.
My sample db has only two fields: name and site_id
Here's my new.html.erb:
<%= form_for #kejsu do |f| %>
<%= f.text_field :name %>
<%= f.text_field :site_id %>
<%= f.submit "Create" %>
<% end %>
Here's the controller:
def new
#kejsu = Kejs.new
end
def create
#kejsu = Kejs.new(params[:kejsu])
if #kejsu.save
redirect_to kejs_index_path
else
render "new"
end
end
After hitting submit button only timestamps are inserted. Here's the snippet from rails server:
Started POST "/cases" for 192.168.56.1 at 2013-12-10 23:11:03 +0000
Processing by KejsyController#create as HTML
Parameters: {"utf8"=>"â", "authenticity_token"=>"Sr2ssiwtRtk9pRT5VfuDFglsEmGnjzwVkRGGBSb2zhA=", "kejs"=> {"name"=>"aa", "site_id"=>"3"}, "commit"=>"Create"}
(0.1ms) begin transaction
SQL (5.1ms) INSERT INTO "kejs" ("created_at", "updated_at") VALUES (?, ?) [["created_at", Tue, 10 Dec 2013 23:11:03 UTC +00:00], ["updated_at", Tue, 10 Dec 2013 23:11:03 UTC +00:00]]
(4.0ms) commit transaction
Redirected to http://192.168.56.101:3000/cases
Completed 302 Found in 14ms (ActiveRecord: 9.2ms)
As you can see those fields are passed as parameters, but INSERT doesn't insert them at all.
I've tried it with default restful routing, writing my own routes and it doesn't work either way.
As a bonus my routes:
get 'cases' => 'kejsy#index', as: :kejs_index
get 'cases/new' => 'kejsy#new', as: :new_kejs
post 'cases' => 'kejsy#create'

Answer 1

Your params[:kejsu] reference uses :kejsu, but your parameters exist under params[:kejs], so you're picking up nil for the value.
The key in params is determined by the class name of the object passed to form_for (i.e. Kejs in this case), not by the variable name (i.e. #kejsu). If you think about it, this makes sense because the variable name is not even available to form_for, since the value of the #kejsu is what is passed.

Answer 2

to debug you can use render :text => params.inspect inside your controller so I will change my code like this
def create
render :text => params.inspect
end
Now go and sumbit your form. What is name of key inside your params? Is it kejsu or kejs?
If its kejs than you can change your code to
def create
#kejsu = Kejs.new(params[:kejs])
if #kejsu.save
redirect_to kejs_index_path
else
render "new"
end
end

Answer 3

As promised, the answer with strong parameters:
def create
#kejsu = Kejs.new(kejs_params)
if #kejsu.save
redirect_to kejs_index_path
else
render "new"
end
end
def kejs_params
params.require(:kejs).permit(:name, :site_id)
end
I needed to change the way I'm dealing with parameters passed via form by creating new method that permits given fields. Now it works like it supposed to.
Thanks for all the hints.