Form_for work but doesn't save into table - ruby-on-rails

Question

I want to make a simple form_forbut that doesn't work fully.
I have two table:
Users -> has_many -> Cvs
this is my form :
<%= form_for(:cvs, action: "create", html: { method: :post }) do |f| %>
Nom : <%= f.text_field :nom %><br />
<%= f.submit %>
<% end %>
In my controller:
def create
#cv = Cv.new(cv_params)
#cv.save
end
With cv_params :
def cv_params
params.require(:cv).permit(:nom)
end
In my route.rb :
post 'createcv' => 'static_pages#createcv'
My controller is static_pages and my view is createcv
The field appear when I load the view, I put something but nothing is create in the table (there is no error). How can I correct that please?
EDIT:
The logs
Started GET "/createcv" for ::1 at 2015-06-16 17:22:03 +0200
Processing by StaticPagesController#createcv as HTML
User Load (0.0ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT 1 [["id", 1]]
Cv Load (0.0ms) SELECT "cvs".* FROM "cvs" WHERE "cvs"."user_id" = ? [["user_id", 1]]
Rendered static_pages/createcv.html.erb within layouts/application (10.0ms)
Rendered layouts/_shim.html.erb (1.0ms)
Rendered layouts/_header.html.erb (2.0ms)
Rendered layouts/_footer.html.erb (1.0ms)
Completed 200 OK in 582ms (Views: 570.6ms | ActiveRecord: 0.0ms)
Started POST "/createcv" for ::1 at 2015-06-16 17:22:12 +0200
Processing by StaticPagesController#createcv as HTML
Parameters: {"utf8"=>"V", "authenticity_token"=>"28oSelskM87GZ/geLj6yl3tOrtvKktH/poBasO4pyt7I2QNKxw9HX4J+yS3cmisuzmGOGnr+6IxZdh+uQGDRDQ==", "cvs"=>{"nom"=>"hjsvqsv"}, "commit"=>"Save Cvs"}
User Load (1.0ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT 1 [["id", 1]]
Cv Load (0.0ms) SELECT "cvs".* FROM "cvs" WHERE "cvs"."user_id" = ? [["user_id", 1]]
Rendered static_pages/createcv.html.erb within layouts/application (11.0ms)
Rendered layouts/_shim.html.erb (0.0ms)
Rendered layouts/_header.html.erb (1.0ms)
Rendered layouts/_footer.html.erb (0.0ms)
Completed 200 OK in 643ms (Views: 629.0ms | ActiveRecord: 1.0ms)

Answer 1

params.require(:cv).permit(:nom)
should be
params.require(:cvs).permit(:nom)
cause all params are nested inside :cvs not :cv
also, looking at your logs and route:
Processing by StaticPagesController#createcv
you need to rename your action to createcv.
Anyway, the routing in your app seems to be wrong... Unless you want it that way.
Ideally you should do something like this:
in static_pages controller, action createcv you'll initiate new CV object:
def createcv
...
#cv = Cv.new
end
and in createcv.html.erb the form would be like this:
<%= form_for #cv do |f| %>
Nom : <%= f.text_field :nom %><br />
<%= f.submit %>
<% end %>
rails will know that #cv in the form is a new object, and it will add the proper route to the form, that will point (depending on your app) to /cvs with post method.
That means when you submit the cv, action create from cv_controller should handle the rest of the process.
In this case you won't need the route you added, it should be there after you added
resources :cvs
This is just an example that might not fit your needs, cause I wouldn't know how did you named your models, controllers, etc..

Answer 2

The answer of Rajarshi Das is fine, only it seems to me that you want to open your form by visiting /createcv. so change your routes to:
# routes.rb
get '/createcv', to: 'static_pages#new'
post 'create', to: 'static_pages#create'
# static_pages controller
def new
#cv = Cv.new
end
def create
#cv = Cv.new(cv_params)
if #cv.save
flash[:alert] = 'Cv created!'
else
render 'new'
flash[:alert] = 'Error in form'
end
private
def cv_params
params.require(:cv).permit(:nom) # :cv must be singular
end
# static_pages/new.html.erb view
<%= form_for #cv do |f| %>
<p>
<%= f.label :nom %>
<%= f.text_field :nom %>
</p>
<%= f.submit %>
<% end %>