Rails core team decided to have consistency by enabling rails command to support everything that rake does.

For example in Rails 5 commands like `db:migrate`, `db:setup`, `db:test` etc which are part of rake command in Rails 4 are now being supported by rails command. However you can still choose to use rake to run those commands similar to how they were run in Rails 4. This is because Rails community has introduced Rake Proxy instead of completely moving the command options from rake to rails.

What happens internally is that when `rails db:migrate` command is executed, Rails checks if `db:migrate` is something that rails natively supports or not. In this case `db:migrate` is not natively supported by rails, so Rails delegates the execution to Rake via Rake Proxy.

If you want to see all the commands that is supported by rails in Rails 5 then you can get a long list of options by executing `rails --help.`



I&#39;m trying to wrap `http.request` into `Promise`:

     new Promise(function(resolve, reject) {
        var req = http.request({
            host: &#39;127.0.0.1&#39;,
            port: 4000,
            method: &#39;GET&#39;,
            path: &#39;/api/v1/service&#39;
        }, function(res) {
            if (res.statusCode &lt; 200 || res.statusCode &gt;= 300) {
                // First reject
                reject(new Error(&#39;statusCode=&#39; + res.statusCode));
                return;
            }
            var body = [];
            res.on(&#39;data&#39;, function(chunk) {
                body.push(chunk);
            });
            res.on(&#39;end&#39;, function() {
                try {
                    body = JSON.parse(Buffer.concat(body).toString());
                } catch(e) {
                    reject(e);
                    return;
                }
                resolve(body);
            });
        });
        req.on(&#39;error&#39;, function(err) {
            // Second reject
            reject(err);
        });
        req.write(&#39;test&#39;);
    }).then(function(data) {
        console.log(data);
    }).catch(function(err) {
        console.log(err);
    });

If I recieve errornous `statusCode` from remote server it will call **First reject** and after a bit of time **Second reject**. How to make properly so it calls only single reject (I think **First reject** is proper one in this case)? I think I need to close `res` myself, but there is no `close()` method on `ClientResponse` object.

**UPD:**
Second reject triggers very rarely - why?

nodejs - How to promisify http.request? reject got called two times

I am new to Angular 2 and TypeScript and I&#39;m trying to follow best practices.

Instead of using a simple JavaScript model ({ }), I&#39;m attempting to create a TypeScript class.

However, Angular 2 doesn&#39;t seem to like it.

My code is:

    import { Component, Input } from &quot;@angular/core&quot;;
    
    @Component({
    	selector: &quot;testWidget&quot;,
    	template: &quot;&lt;div&gt;This is a test and {{model.param1}} is my param.&lt;/div&gt;&quot;
    })
    
    export class testWidget {
    	constructor(private model: Model) {}
    }
    
    class Model {
    	param1: string;
    }

and I&#39;m using it as:

    import { testWidget} from &quot;lib/testWidget&quot;;
    
    @Component({
    	selector: &quot;myComponent&quot;,
    	template: &quot;&lt;testWidget&gt;&lt;/testWidget&gt;&quot;,
    	directives: [testWidget]
    })

I&#39;m getting an error from Angular:

&gt; EXCEPTION: Can&#39;t resolve all parameters for testWidget: (?).

So I thought, Model isn&#39;t defined yet... I&#39;ll move it to the top!

Except now I get the exception:

&gt; ORIGINAL EXCEPTION: No provider for Model!

How do I accomplish this??

Edit: Thanks to all for the answer.  It led me to the right path.

In order to inject this into the constructor, I need to add it to the providers on the component. 

This appears to work:

    import { Component, Input } from &quot;@angular/core&quot;;

    class Model {
        param1: string;
    }

    @Component({
        selector: &quot;testWidget&quot;,
        template: &quot;&lt;div&gt;This is a test and {{model.param1}} is my param.&lt;/div&gt;&quot;,
        providers: [Model]
    })
    
    export class testWidget {
        constructor(private model: Model) {}
    }
    


How do I declare a model class in my Angular 2 component using TypeScript?

I&#39;m new to rails. I noticed when generating data migration in rails 5, some people use `rails db:migrate` over `rake db:migrate`. Can someone explain the difference between the rails vs rake command in database migration? Does it mean rake command is obsolete in rails 5?

many thanks

rails db:migrate vs rake db:migrate

<p>I'm new to rails. I noticed when generating data migration in rails 5, some people use <code>rails db:migrate</code> over <code>rake db:migrate</code>. Can someone explain the difference between the rails vs rake command in database migration? Does it mean rake command is obsolete in rails 5?</p>
<p>many thanks</p>


I&#39;m using Rails 5, and Devise 3.5.1.

Going through a nice (older) book about creating/testing an API, which uses Devise authentication. It was written before Rails 5, so I chose not to use the new api-only version.

Here&#39;s my test...

    #/spec/controllers/api/v1/users_controller_spec.rb    

    require &#39;rails_helper&#39;
    
    describe Api::V1::UsersController, :type =&gt; :controller do
        before(:each) { request.headers[&#39;Accept&#39;] = &quot;application/vnd.marketplace.v1&quot; }
        describe &quot;GET #show&quot; do
            before(:each) do
                @user = FactoryGirl.create :user
                get :show, params: {id: @user.id}, format: :json
            end
            it &quot;returns the information about a reporter on a hash&quot; do
                user_response = JSON.parse(response.body, symbolize_names: true)
                expect(user_response[:email]).to eql @user.email
            end
            it { should respond_with 200 }
        end
    end

And here&#39;s a completely unexpected RSpec error

    Devise::MissingWarden:
           Devise could not find the `Warden::Proxy` instance on your request environment.
           Make sure that your application is loading Devise and Warden as expected and that the `Warden::Manager` middleware is present in your middleware stack.
           If you are seeing this on one of your tests, ensure that your tests are either executing the Rails middleware stack or that your tests are using the `Devise::Test::ControllerHelpers` module to inject the `request.env[&#39;warden&#39;]` object for you.


So I go here - http://www.rubydoc.info/gems/devise/Devise/Test/ControllerHelpers

and tried this -&gt; **include Devise::Test::ControllerHelpers**

which didn&#39;t help because the file `controller_helpers.rb` is nowhere in my project

What did I miss here?

Thanks

Why is my RSpec not loading Devise::Test::ControllerHelpers?

What is the purpose of `transient do` in FactoryBot factories?

I&#39;ve seen a lot of factories that begin with something like below. 

    factory :car do
      owner nil
      other_attribute nil
    end
    ...

I&#39;ve found some information on this blog:  
[Using FactoryGirl to easily create complex data sets in Rails](https://web.archive.org/web/20180403000920/http://blog.thefrontiergroup.com.au/2014/12/using-factorygirl-easily-create-complex-data-sets-rails/)

But I still don&#39;t fully understand how and why to do this. My experience with FactoryBot is minimal.

Could anyone with some experience using FactoryBot share some insight?

What is the purpose of a `transient do` block in FactoryBot factories?

I am doing email validation in Rails with:

    validates_format_of :email, :with =&gt; /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i

Also, I do HTML5 validation in the frontend but email addresses like

    ..abc@gmail.com
    .abc@gmail.com

still are valid. What am I missing?

Email validation in Ruby on Rails?

I&#39;ve got an API mode Rails 5 app that won&#39;t let me run `rake routes` or `rails s`. The error I get is:

    $ rake routes
    rake aborted!
    LoadError: Could not load the &#39;listen&#39; gem. Add `gem &#39;listen&#39;` to the development group of your Gemfile
    .../config/environment.rb:5:in `&lt;top (required)&gt;&#39;
    LoadError: cannot load such file -- listen
    .../config/environment.rb:5:in `&lt;top (required)&gt;&#39;
    Tasks: TOP =&gt; routes =&gt; environment
    (See full trace by running task with --trace)

I&#39;ve verified that `listen` is in the development group in my Gemfile:

    group :development do
      gem &#39;listen&#39;, &#39;~&gt; 3.1.5&#39;
      # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
      gem &#39;spring&#39;
      gem &#39;spring-watcher-listen&#39;, &#39;~&gt; 2.0.0&#39;
    end

And that it&#39;s in my Gemfile.lock:

    $ cat Gemfile.lock | grep &#39;listen&#39;
        listen (3.1.5)
        spring-watcher-listen (2.0.0)
          listen (&gt;= 2.7, &lt; 4.0)
      listen (~&gt; 3.1.5)
      spring-watcher-listen (~&gt; 2.0.0)

I&#39;ve bundle updated, and bundle installed, and verified that `gem install listen` works. This was working earlier this week, but I&#39;m not having luck going back through my commits. 

    $ ruby -v
    ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin14]

I don&#39;t see it in `vendor/cache` but I&#39;m not sure what to make of that...

    $ bundle package | grep &#39;listen&#39;

Appreciate the help!

**Update:**

I can &quot;fix&quot; the problem by putting `gem &#39;listen&#39;, &#39;~&gt; 3.1.5&#39;` in the global Gemfile (and removing it from `:development`). Then all the errors go away and everything works, but that seems wrong.


LoadError: Could not load the &#39;listen&#39; gem (Rails 5)

I have been (hours) trouble with associations in Rails. I found a lot of similar problems, but I couldn&#39;t apply for my case:

City&#39;s class:

    class City &lt; ApplicationRecord
      has_many :users
    end

User&#39;s class:

    class User &lt; ApplicationRecord
      belongs_to :city
      
      validates :name, presence: true, length: { maximum: 80 }
      validates :city_id, presence: true
    end

Users Controller:

    def create
        Rails.logger.debug user_params.inspect
        @user = User.new(user_params)
        if @user.save!
          flash[:success] = &quot;Works!&quot;
          redirect_to &#39;/index&#39;
        else
          render &#39;new&#39;
        end
     end

    def user_params
      params.require(:user).permit(:name, :citys_id)
    end

Users View:

    &lt;%= form_for(:user, url: &#39;/user/new&#39;) do |f| %&gt;
      &lt;%= render &#39;shared/error_messages&#39; %&gt;

      &lt;%= f.label :name %&gt;
      &lt;%= f.text_field :name %&gt;
      
      &lt;%= f.label :citys_id, &quot;City&quot; %&gt;
      &lt;select name=&quot;city&quot;&gt;
        &lt;% @city.all.each do |t| %&gt;
          &lt;option value=&quot;&lt;%= t.id %&gt;&quot;&gt;&lt;%= t.city %&gt;&lt;/option&gt;
        &lt;% end %&gt;
      &lt;/select&gt;
    end

Migrate:

    class CreateUser &lt; ActiveRecord::Migration[5.0]
      def change
        create_table :user do |t|
          t.string :name, limit: 80, null: false
          t.belongs_to :citys, null: false
          t.timestamps
      end
    end

Message from console and browser:

    ActiveRecord::RecordInvalid (Validation failed: City must exist):


Well, the problem is, the attributes from User&#39;s model that aren&#39;t FK they are accept by User.save method, and the FK attributes like citys_id are not. Then it gives me error message in browser saying that &quot;Validation failed City must exist&quot;.

Thanks



Validation failed Class must exist

It&#39;s a constant headache when dealing with websockets, and it kills my performance in addition to adding bugs. Since ActionCable is the whole reason I upgraded I&#39;d very much like to get rid of it completely.

Rails: How to disable turbolinks in Rails 5?

I&#39;ve tried to find some solution for this, but I really couldn&#39;t find anything related with the errors that is appearing to me when I run the rails command: 

&gt; rails generate model Book title:string summary:text isbn:string

   
    /home/vmu/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:51: warning: constant ::Fixnum is deprecated
    /home/vmu/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:52: warning: constant ::Bignum is deprecated
    /home/vmu/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/core_ext/numeric/conversions.rb:138: warning: constant ::Fixnum is deprecated
    Running via Spring preloader in process 3579
    Expected string default value for &#39;--jbuilder&#39;; got true (boolean)
          invoke  active_record
       identical    db/migrate/20170104114702_create_books.rb
       identical    app/models/book.rb
          invoke    test_unit
       identical      test/models/book_test.rb
       identical      test/fixtures/books.yml

Anyone know what may be causing these errors?

warning: constant ::Fixnum is deprecated When generating new model

Rails 5.1 [removes a whole load of previously deprecated methods](https://blog.driftingruby.com/ruby-on-rails-5-1-0-deprecations/?utm_source=rubyweekly&amp;utm_medium=email). Among them is the old friend `render :text`.

It was very useful when you need to render _some_ text, but don&#39;t want the overhead of a view template. Examples:

    render text: &quot;ok&quot;
    render text: t(&#39;business_rules.project_access_denied&#39;), status: 401

What to use instead?


What to use instead of `render :text` (and `render nothing: true`) in rails 5.1 and later?

I have simple action show 

    def show
      @field = Field.find_by(params[:id])
    end

and i want write spec for it 

    require &#39;spec_helper&#39;
    
    RSpec.describe FieldsController, type: :controller do
    
        let(:field) { create(:field) }
    
      it &#39;should show field&#39; do
        get :show, id: field
        expect(response.status).to eq(200)
      end
    end


but I have got an error

    Failure/Error: get :show, id: field
     
     ArgumentError:
       unknown keyword: id

How to fix it?

Content Type	Original Author	Original Content on Stackoverflow
Question	York Wang	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	Vishal	View Answer on Stackoverflow

rails db:migrate vs rake db:migrate

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

How do I declare a model class in my Angular 2 component using TypeScript?

nodejs - How to promisify http.request? reject got called two times

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