By Ahmed Refaat Tawfik

Ruby Social Gems: LinkedIn

By Ahmed Refaat Tawfik

Ruby Social Gems

Introduction to the Ruby Social Gems series

In this series, we are going to cover gems based around social media and social media services, such as LinkedIn, Twitter, Facebook, Youtube, and any other suggested gems.

LinkedIn Gem

The first gem in the series is the LinkedIn gem, and the LinkedIn APIs. We’ll see how simple and clear the LinkedIn API is, and how the gem makes it more accessible.

I should point out, before we start, another important gem: omniauth and omniauth-linkedin. These gems allow the user to login with their LinkedIn account, or Facebook, or Twitter, etc. We’ll dedicate a tutorial to Omniauth later, but we’ll use Devise to create simple user accounts in this article.


The Demo Application

The application we are going to build with the LinkeIn gem is pretty straightforward. We will get all the user data from LinkedIn into our rails app models, so we can display it in whatever format we want.

Starting with the application:

You can download the full source code of the tutorial form github here

Create a new rails app:
rails new rsg_linkedin_gem

Add the linkedin, devise, bootstrap gems in path/to/project/Gemfile

And then run
bundle install

We are going to use bootstrap for the UI component.


Before we start, we need to run few commands to initialize the project.

Create the User Model and Bootstrap Styling

The following commands are found on the github page of the devise project and the twitter bootstrap project

To install devise
rails generate devise:install

To create the user model
rails generate devise user

To configure views
rails generate devise:views

To install bootstrap
rails g bootstrap:install

To set a layout bootstrap
rails g bootstrap:layout application fixed

Remove the index file from

Application Structure


We will need only to create one controller, which will handle the connection to LinkedIn. The controller will pull the data from the API and push it to our models.

rails g controller linkedin

Add the following line at the beginning of the linkedin controller

We’ll add a few helper methods to handle the authentication and APIs queries.

First, and before diving into any methods, we should define the configuration hash. The hash holds all the information to negotiate a connecion with the LinkedIn APIs. The request_token_path element grants permissions to access the different parts of the APIs, such as r_fullprofile for a full profile or r_network for connections.

You could add more tokens to request_token_path element by concatenating them with a +, such as:

The full object, which we will add at the top of the LinkedIn controller, is below:

The LinkedinOauthSetting object is used to store the access token, and access secret.

The purpose of generate_linkedin_oauth_url method is to generate the linkedin authentication uri, which asks the user for permissions. The method checks first if the object already exists for the current user. If not, it’ll create a linkedin client object and build the request_token object with the oauth_callback. This callback is the method that will be called after the user grants the access. Now, store the request_token.token and request_token.secret in the session, as they will be used to create the persisted access tokens. Finally, redirect the user to the authorize_url. If the user has been here before, it will redirect them to the /oauth_account action directly.


The authentication method, which is set as the callback in the request_token object, authenticates the user for the first time. If the user is already authenticated, it will redirect the user to home without doing anything.


First, we create a linkedin client object with our keys (‘your-api-key’, ‘your-secret-key’) which you get after registering your application on the linked-in api. If the oauth_verifier params exists, which is passed by LinkedIn, the user has granted access to the application so we’ll authorize the client. When we authorize for the first time, we need to store and get the access token and secret to retrieve them later.

The get_client helper simply returns an authorized linkedin client object. Here, the linkedin_oauth_setting object is retrieved from database and authorizes the client object.


Here is the root action. It checks if this user already has a linkedin oauth setting. If so,it’ll redirect them to the linkedin_profile action.

Here we show simple html page of the data pulled from the linkedin APIs.


Add the following to path/to/project/config/routes


We should make few changes before running the server.

Modify the layout view path/to/project/app/views/layouts/application.html.erb
by removing the following block 65-75, and then replacing the following lines 50-52 with

Modify the index view [path/to/project/app/views/linkedin/index.html.erb]:


We should stop here to look at the LinkedIn APIs and what we are going to cover here. We will also learn the specification of the models we need to create in our application.

The LinkedIn developer site is the best place, this Quick Start Guide is comprehensive. The guide shows how to create the application on the LinkedIn, as well as how to get your API Key and Secret Key (which you should “never share with anyone”).

You’ll see a demonstration of how to connect with a ruby script without any gems which takes much more time than the gem.

The table on the Authentication page lists the permissions, which we’ll see how to use it later.

Here’s few of them:

Permission Scope
Your Profile Overview r_basicprofile
Your Full Profile r_fullprofile
Your Email Address r_emailaddress
Your Connections r_network

We’ll focus on the Profile Fields part of the APIs, because we can’t cover the whole API. I think you’ll get a good sense of how the gem works by writing this demo application.

Let’s focus first on the Basic Profile Fields. This will be the first part from the API to map to our rails application.


This is an important model that stores two important values for each user that allow access their account without asking for permission each time.

Run the following commands to generate the above model:

rails g model linkedin_oauth_setting atoken:string asecret:string user_id:integer
rake db:migrate

Remember always to check this line above each table “These fields require the r_basicprofile member permission” to use this permission params later.

Add the association to the linkedin_oauth_setting model:


Selecting few attributes to add to the model, and here’s a list of them:

Field Description
first-name the member’s first name
last-name the member’s last name
maiden-name the member’s maiden name
formatted-name the member’s name formatted based on language
headline the member’s headline (often “Job Title at Company”)
location:(name) Generic name of the location of the LinkedIn member, (ex: “San Francisco Bay Area”)
industry the industry the LinkedIn member has indicated their profile belongs to (Industry Codes)
summary A long-form text area where the member describes their professional profile
specialties A short-form text area where the member enumerates their specialties
picture-url A URL to the profile picture, if the member has associated one with their profile and it is visible to the requestor
public-profile-url A URL to the member’s public profile, if enabled

Now run the following command to create the basic_profiles table:

rails g model basic_profile first_name:string last_name:string maiden_name:string formatted_name:string headline:string location:string industry:string summary:string specialties:string picture_url:string public_profile_url:string user_id:integer

rake db:migrate

Add the association to the basic_profile model:


Selecting few attributes to add to the model, you’ll notice that the full_profile table contains many other complex objects like (publications, patents, languages, skills, etc) We are going to build separate models for a few of them. Here’s a list of them:

Field Description
associations A short-form text area enumerating the Associations a member has
honors A short-form text area describing what Honors the member may have
interests A short-form text area describing the member’s interests

Now run the following command to create the full_profiles table:

rails g model full_profile associations:string honors:string interests:string user_id:integer

rake db:migrate

Add the association to the full_profile model:


Let’s add a few attributes to the model:

Field Description
title the job title held at the position, as indicated by the member
summary a summary of the member’s position
start-date a structured object with month and year fields indicating when the position began
end-date a structured object with month and year fields indicating when the position ended
is-current a “true” or “false” value, depending on whether it is marked current
company the company the member works for

Now run the following command to create the positions table:

rails g model position title:string summary:string start_date:date end_date:date is_current:boolean company:string full_profile_id:integer

rake db:migrate

Add the association to the position model:


For the Education model we have:

Field Description
school-name the name of the school, as indicated by the member
field-of-study the field of study at the school, as indicated by the member
start-date a structured object a year field indicating when the education began
end-date a structured object with a year field indicating when the education ended
degree a string describing the degree, if any, received at this institution
activities a string describing activities the member was involved in while a student at this institution
notes a string describing other details on the member’s studies

Now run the following command to create the educations table:

rails g model education school_name:string field_of_study:string start_date:date end_date:date degree:string activities:string notes:string full_profile_id:integer

rake db:migrate

Add the association to the model:


Add the association to the model:

LinkedIn APIs Inquiries

Now we have in the linkedin controller the required helper methods for authentication. We have stored the required tokens for later access, so it is time to write some helper methods to inquiry the APIs. We will use are model objects for this portion.

Querying the APIs is very simple with the gem. After authorizing the client object, you call the profile method on the object and pass whatever fields you want to get, for example:
client.profile(:fields => [:first_name, :last_name, :maiden_name , :formatted_name ,:headline])

The following methods are used to pull the data from the APIs and push it into rails models. As you can see, we are creating the object with the retrieved json object from the APIs with a few customizations.





There are a couple of examples in the gem repo on github, for example:

Let’s the put it all together and build a simple view to display for our application to display the stored data.

Here’s the view path/to/project/linkedin/linkedin_profile.html.erb

Wrapping up

Well, I hope this tutorial to be useful, and be a good introduction to using LinkedIn gem, and the APIs in general, if you would like to suggest the next gem to cover, we’ll go for it, and thanks for reading.

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