Uninitialized constant error constant Skill:Description - sql

Question

I am trying to make a form and submit a skill and description into a database. I am almost done however I am getting this error after submitting my info:
NameError in SkillsController#create
uninitialized constant Skill::Description
and it points to this action in my controller:
def create
#skills = Skill.new(skill_params)
if #skills.save
redirect_to :action => 'index'
else
#skills = Skill.find(:all)
render :action => 'new'
end
end
I have a private method at the bottom defining params which states:
private
def skill_params
params.require(:skill).permit(:description)
end
This is the fullstack trace:
activerecord (4.1.2.rc1) lib/active_record/inheritance.rb:133:in `compute_type'
activerecord (4.1.2.rc1) lib/active_record/reflection.rb:221:in `klass'
activerecord (4.1.2.rc1) lib/active_record/associations/association.rb:214:in `raise_on_type_mismatch!'
activerecord (4.1.2.rc1) lib/active_record/associations/collection_association.rb:356:in `block in replace'
activerecord (4.1.2.rc1) lib/active_record/associations/collection_association.rb:356:in `each_char'
activerecord (4.1.2.rc1) lib/active_record/associations/collection_association.rb:356:in `replace'
activerecord (4.1.2.rc1) lib/active_record/associations/collection_association.rb:41:in `writer'
activerecord (4.1.2.rc1) lib/active_record/associations/builder/association.rb:118:in `description='
activerecord (4.1.2.rc1) lib/active_record/attribute_assignment.rb:45:in `public_send'
activerecord (4.1.2.rc1) lib/active_record/attribute_assignment.rb:45:in `_assign_attribute'
activerecord (4.1.2.rc1) lib/active_record/attribute_assignment.rb:32:in `block in assign_attributes'
activerecord (4.1.2.rc1) lib/active_record/attribute_assignment.rb:26:in `each'
activerecord (4.1.2.rc1) lib/active_record/attribute_assignment.rb:26:in `assign_attributes'
activerecord (4.1.2.rc1) lib/active_record/core.rb:455:in `init_attributes'
activerecord (4.1.2.rc1) lib/active_record/core.rb:198:in `initialize'
activerecord (4.1.2.rc1) lib/active_record/inheritance.rb:30:in `new'
activerecord (4.1.2.rc1) lib/active_record/inheritance.rb:30:in `new'
app/controllers/skills_controller.rb:29:in `create'
actionpack (4.1.2.rc1) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.1.2.rc1) lib/abstract_controller/base.rb:189:in `process_action'
actionpack (4.1.2.rc1) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.1.2.rc1) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:86:in `call'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:86:in `run_callbacks'
actionpack (4.1.2.rc1) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.1.2.rc1) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.1.2.rc1) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.1.2.rc1) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.1.2.rc1) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.1.2.rc1) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.1.2.rc1) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.1.2.rc1) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.1.2.rc1) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.1.2.rc1) lib/abstract_controller/base.rb:136:in `process'
actionview (4.1.2.rc1) lib/action_view/rendering.rb:30:in `process'
actionpack (4.1.2.rc1) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.1.2.rc1) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.1.2.rc1) lib/action_controller/metal.rb:232:in `block in action'
actionpack (4.1.2.rc1) lib/action_dispatch/routing/route_set.rb:82:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/routing/route_set.rb:82:in `dispatch'
actionpack (4.1.2.rc1) lib/action_dispatch/routing/route_set.rb:50:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/journey/router.rb:71:in `block in call'
actionpack (4.1.2.rc1) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.1.2.rc1) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/routing/route_set.rb:678:in `call'
warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
warden (1.2.3) lib/warden/manager.rb:34:in `catch'
warden (1.2.3) lib/warden/manager.rb:34:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:35:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/middleware/flash.rb:254:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.1.2.rc1) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.1.2.rc1) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
activerecord (4.1.2.rc1) lib/active_record/migration.rb:380:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.1.2.rc1) lib/active_support/callbacks.rb:82:in `run_callbacks'
actionpack (4.1.2.rc1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.1.2.rc1) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.1.2.rc1) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.1.2.rc1) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.1.2.rc1) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.1.2.rc1) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.1.2.rc1) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.1.2.rc1) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.1.2.rc1) lib/action_dispatch/middleware/static.rb:64:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.1.2.rc1) lib/rails/engine.rb:514:in `call'
railties (4.1.2.rc1) lib/rails/application.rb:144:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'
and this is my schema:
create_table "skills", force: true do |t|
t.datetime "created_at"
t.string "description"
end
This is my skills/new.html.erb form:
<h1>Add new Skill</h1>
<%= form_tag ({action: "create"}) do %>
<p><label for="skill">Skill</label>:
<%= text_field 'skill', 'title' %></p>
<p><label for="skill_description">Description</label><br/>
<%= text_area 'skill', 'description' %></p>
<%= submit_tag "Create" %>
<% end %>
<%= link_to 'Back', {:action => 'index'} %>
I hope I have provided enough info to solve the issue and thank you anyone who knows what to do to initialize description. Thanks again and cheers!
index.html.erb:
<% if #skills.blank? %>
<p>There are not any skills currently saved in the system.</p>
<% else %>
<p>These are the current skills saved in our system</p>
<ul id="skills">
<% #skills.each do |c| %>
<li><%= link_to c.title, {:action => 'show', :id => c.id} -%></li>
<li>
<%= link_to c.title, {:action => 'show', :id => c.id} -%>
<b> <%= link_to 'Edit', {:action => 'edit', :id => c.id} %></b>
<b> <%= link_to "Delete", {:action => 'delete', :id => c.id},
:confirm => "Are you sure you want to delete this skill??" %></b>
</li>
<% end %>
</ul>
<p><%= link_to "Add new Skill", {:action => 'new' }%></p>
<% end %>
I do not have a title param available and it is causing problems.
skill.rb:
class Skill < ActiveRecord::Base
has_many :skill
has_many :description
end
hope this new info helps! Thanks again for taking a look with me.

Answer 1

Change the model skill.rb to this:
class Skill < ActiveRecord::Base
end
The has_many method is used to define Relations in the ORM context. There is no need to define the columns of the table itself. Rails get that information by itself.
You also have other issues in your index.html.erb and new.html.erb pages. You are referring to a title property of skill, but your migration does not show a title property.
I would recommend you delete controller, model, views, migration and data table itself (assuming that it is just a development project) and use scaffold to generate them using the command below:
$ bin/rails generate scaffold Skill title:string description:text
Please note that $ is not part of the command, its the prompt in your terminal.
Read up more on rails command line here

Answer 2

I think you'd better use form_for. There are no skill_params returning if you build the form that way.
form_tag is better for no model forms.
Try like this:
# skills_controller
def new
#skill = Skill.new
end
# new.html.erb
<%= form_for #skill do |f| %>
<%= f.text_area :description %>
# Other fields and tags...
<%= f.submit %>
<% end %>
Hope this helps.