Cannot save data by form_for Rails in Ruby : Unpermitted parameter: projectImages

Question

I am trying to save form data by form_for new.erb.html

<%= form_for @project do |f| %>
  <h4>
    <label for = "projectName">Title(required)</label>
    <%= f.text_field :projectName, :maxlength => 50 %>
  </h4>

  <%= f.submit %>
<% end -%>

ProjectsController

    class Com::A::B::C::ProjectsController < ApplicationController
      def index
        @projects = Project.all
      end

      def new
        @project = Project.new
        @allTags = Tag.all
        @allBenefits = Benefit.all
      end
def create
    @project = Project.new(project_params)

    if @project.save
      redirect_to :action => 'index'
    else
      render :action => 'new'
    end
  end
def project_params
    params.require(:project).permit(:projectName)
  end

But nothings getting saved on the database

html tags for text_fiels looks like,

<input id="com_a_b_c_project_projectName" type="text" name="com_a_b_c_project[projectName]" size="50" maxlength="50">

I tried adding url=>"com_a_b_c_project_path" still nothing persists I am new to rails in ruby, so any help would be nice.

Routes

namespace :com do
        namespace :a do
          namespace :b do
            namespace :c do
              get 'projects/index'
              resources :projects do
                 end
            end
          end
        end
      end

I get following exception:

param is missing or the value is empty: project

Request

Parameters:
"utf8"=>"✓",
 "authenticity_token"=>"",
 "com_a_b_c_project"=>{"projectName"=>"s"
 "commit"=>"Create Project"

rake rotes

com_a_b_c_projects_index GET /com/a/b/c/projects/index(.:format) com/a/b/c/projects#index com_a_b_c_projects GET /com/a/b/c/projects(.:format) com/a/b/c/projects#index POST /com/a/b/c/projects(.:format) com/a/b/c/projects#create new_com_a_b_c_project GET /com/a/b/c/projects/new(.:format) com/a/b/c/projects#new edit_com_a_b_c_project GET /com/a/b/c/projects/:id/edit(.:format) com/a/b/c/projects#edit com_a_b_c_project GET /com/a/b/c/projects/:id(.:format) com/a/b/c/projects#show PATCH /com/a/b/c/projects/:id(.:format) com/a/b/c/projects#update PUT /com/a/b/c/projects/:id(.:format) com/a/b/c/projects#update DELETE /com/a/b/c/projects/:id(.:format) com/a/b/c/projects#destroy

NOTE I can save data with form_tag But not with form_for... However I need to use form_for otherwise I have to bind object to each field

<%= form_tag :action => 'create', :controller => 'projects' do %>
<h4><label for = "projectName">Title(required)</label> <%= text_field 'project', 'projectName'> </h4>

Cheers

If it returns error, show us. And also show your routes because you have namespace Com::A::B::C:: in your controller. — HashRocket
– HashRocket, Commented Apr 7, 2016 at 1:13
I get following exception: param is missing or the value is empty: project app/controllers/com/a/b/c/projects_controller.rb:59:in project_params' app/controllers/com/a/b/cp/projects_controller.rb:20:in create' Request Parameters: {"utf8"=>"✓", "authenticity_token"=>"", "com_a_b_c_project"=>{"projectName"=>"s" "commit"=>"Create Project"} — Explorer
– Explorer, Commented Apr 7, 2016 at 1:29
Routes namespace :com do namespace :a do namespace :b do namespace :c do get 'projects/index' resources :projects do end end end end end — Explorer
– Explorer, Commented Apr 7, 2016 at 1:29
As an aside, you might start out with using snake_case for model attribute names instead of camelcase, and note that this is probably not the only namespace issue you will have. Welcome to rails and good luck — trh
– trh, Commented Apr 7, 2016 at 2:31

sixty4bit · Accepted Answer · 2016-04-07 02:29:41Z

2

The Rails docs provide information on using form_for with namespacing in section 2.3.1:

If you have created namespaced routes, form_for has a nifty shorthand for that too. If your application has an admin namespace then

form_for [:admin, @article]

will create a form that submits to the ArticlesController inside the admin namespace (submitting to admin_article_path(@article) in the case of an update). If you have several levels of namespacing then the syntax is similar:

form_for [:admin, :management, @article]

So in your case it looks like it would be:

form_for [:com, :a, :b, :c, @project]

answered Apr 7, 2016 at 2:29

sixty4bit

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3 Comments

Brad Axe Over a year ago

This is the proper way:)

Explorer Over a year ago

This throws me error undefined method

com_a_b_c_com_a_b_c_projects_path' for #<#<Class:0x9238530>:0x922d7d8>           actionpack (4.2.5.2) lib/action_dispatch/routing/polymorphic_routes.rb:220:in

polymorphic_method'

Explorer Over a year ago

def project_params params.require(:project).permit(:projectName, :briefDesc, :whatSection, :challengers, :status, :valueProposal, :maturityLevel,:tag_ids =>[])#tag_ids: [] end

Brad Axe · Accepted Answer · 2016-04-07 02:33:26Z

1

In your controller, you are requiring a 'project' param by the line:

params.require(:project).permit(:projectName)

But looking at the request, the param being sent is 'com_a_b_c_project'.

If you change it to:

params.require(:com_a_b_c_project).permit(:projectName)

all should be well.

answered Apr 7, 2016 at 2:33

Brad Axe

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1 Comment

sixty4bit Over a year ago

not trying to be a sore sport or anything, but it's probably better to mark my answer correct since it uses the proper style as indicated by the rails docs

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