TILs - Fueling Curiosity, One Insight at a Time

The Blocked Host is a new feature of Rails 6. To resolve the Blocked Host error in rails, add config.hosts.clear to config/environments/development.rb in your Rails project. This disables the functionality in the development environment, allowing requests from ngrok.
#host-block-issue, #rails

Extract the source code of the gem to a local directory by using the command gem unpack GEMNAME.

Setup Tailscale in local device and serve your localhost
1. Intsall tailscale from https://tailscale.com/download for your device.
2. Sign up and follow the steps so that your device gets connected.
3. Open your terminal and download tailscale CLI using brew install tailscale
4. Run tailscale serve 3000 (you might get some warning regarding client and server version mismatch)
5. It will say Serve is not enabled on your tailnet. and ask you to visit https://login.tailscale.com/f/serve?node=<node-id>
6. In that link enable the option , and that's it , it will serve your port 3000 successfully.
#tailscale , #devops

While changing a column type from one type to another and running rails db:migrate , it will throw the below error



above error ^ because i was converting tags field from type string to jsonb
so in order to fix this we have to mention the USING tags::jsonb and cast the type.



#migration, #database, #rails

Create a PostgreSQL Database in Docker .

Step 1: Download the latest version of the Postgres image :



Step 2: Create and Run Postgres Container :



Step 3: Verify Executing Container :



Step 4: Interact with Executing Container :



Step 5: Connect to Postgresql Database Server :



Step 6: Create Postgresql Database :



Step 7: Establish a connection with database :



Step 8: Create Database User :



Step 9: Exit :



#devops #docker

In a typical Rack middleware setup, the call method handles the initial request and generates a response, but it does not control subsequent redirects initiated by external services. If an external service, such as Slack's OAuth, triggers additional redirects after your application responds, modifying headers for those redirects within the same call method may not be directly achievable. Handling subsequent redirects may require alternative approaches, such as additional middleware or different parts of your application's code.
#rails , #rack , #middleware

test your gem locally before publishing.
• STEP 1 - cd into your gem directory and run gem build your-gem.gemspec
• STEP 2 - in the same directory then run gem install ./your-gem-<version>.gem (<version> will be replaced by the current version of your gem)
• STEP 3 - Now cd into your project where you want to install this gem.
• STEP 4 - Open Gemfile and add gem 'your-gem', path: '/path/to/your-gem' (Replace /path/to/your-gem with the actual path to your gem.
#ruby-gems , #rails
TIP: you can get your path by running pwd in your terminal where you have opened your gem file.

Fly Secret Value Displaying Feature:

We can able to see Fly secrets values from terminal . From the Dashboard of fly we can't able to the secret value. But from the terminal we can able to the see secret value .
For that we have use below command:
• First Go the project in terminal and enter the fly ssh console. It redirects you to the fly application in remote.
• Then you can see the what value you want using echo command. Ex: echo $DATABASE_URL . After entered like this it will display what is the value of the key. Likewise you can place what are ever key want to see.

for tracking emails for analytics purpose sent from mailgun we can use o:tag parameter along with parameters like subject and domain
https://www.mailgun.com/blog/email/tags-explained-gaining-useful-insights-from-email-segmentation/

To delete a Docker image we can use a command docker rmi [IMAGE_ID or REPOSITORY:TAG] and ,
To remove all dangling images that consume disk space , can use docker image prune