Update Project

Let’s make some changes. Let’s start with manual changes. It’ll help you get to know how things work.

Change Lambda Function

The Lambda Console allows us to edit code directly with the browser. It allows us to test, debug, and learn quickly. We’ll add a puts "debugging posts#index called" statement.

You can click Deploy to deploy the changes.

Jets Logs

You can also use the jets logs command to tail the logs in your terminal.

❯ jets logs -f
2023-10-29 18:28:02 UTC INIT_START Runtime Version: ruby:3.2.v9 Runtime Version ARN: arn:aws:lambda:us-west-2::runtime:b96ddb9b1905c3979339d7706a5f7cfda1d851593b1255eb0f15ff573c17fd28
2023-10-29 18:28:04 UTC START RequestId: 8415926a-3a58-4cbc-98cb-a8f87e008e47 Version: $LATEST
2023-10-29 18:28:04 UTC Started GET "/" for at 2023-10-29 18:28:04 +0000
2023-10-29 18:28:04 UTC Processing Jets::WelcomeController#index
2023-10-29 18:28:04 UTC   Rendering /opt/ruby/gems/3.2.0/bundler/gems/jets-3941d8f7e00f/engines/internal/app/views/jets/welcome/index.html.erb
2023-10-29 18:28:04 UTC   Rendered /opt/ruby/gems/3.2.0/bundler/gems/jets-3941d8f7e00f/engines/internal/app/views/jets/welcome/index.html.erb (Duration: 5.4ms | Allocations: 13670)
2023-10-29 18:28:04 UTC Completed Status Code 200 in 0.041s
2023-10-29 18:28:04 UTC END RequestId: 8415926a-3a58-4cbc-98cb-a8f87e008e47
2023-10-29 18:28:04 UTC REPORT RequestId: 8415926a-3a58-4cbc-98cb-a8f87e008e47  Duration: 144.73 ms     Billed Duration: 145 ms Memory Size: 1536 MB   Max Memory Used: 168 MB  Init Duration: 2361.75 ms
2023-10-29 18:28:05 UTC START RequestId: 0e483ed2-c7c9-43e3-babb-7c165c9a3365 Version: $LATEST
2023-10-29 18:28:05 UTC Started GET "/posts" for at 2023-10-29 18:28:05 +0000
2023-10-29 18:28:05 UTC Processing PostsController#index
2023-10-29 18:28:05 UTC   Parameters: {"catchall":"posts"}
2023-10-29 18:28:05 UTC debugging post#index called
2023-10-29 18:28:05 UTC   Rendering layout layouts/application.html.erb
2023-10-29 18:28:05 UTC   Rendering posts/index.html.erb within layouts/application
2023-10-29 18:28:06 UTC   Rendered posts/index.html.erb within layouts/application (Duration: 140.2ms | Allocations: 10015)
2023-10-29 18:28:06 UTC   Rendered layout layouts/application.html.erb (Duration: 179.9ms | Allocations: 22792)
2023-10-29 18:28:06 UTC Completed Status Code 200 in 0.661s
2023-10-29 18:28:06 UTC END RequestId: 0e483ed2-c7c9-43e3-babb-7c165c9a3365
2023-10-29 18:28:06 UTC REPORT RequestId: 0e483ed2-c7c9-43e3-babb-7c165c9a3365  Duration: 726.32 ms     Billed Duration: 727 ms Memory Size: 1536 MB   Max Memory Used: 180 MB

The jets logs command will use the Log Group from the controller Lambda function, IE: /aws/lambda/demo-dev-controller, so we do not have to specify the name as we did in the Jets Project Job Learn Guide.

Update Code and Deploy Changes

So far, we have been making manual changes. We should codify the changes. To help see the changes, let’s make some additional changes so that it’s easy to check.


class PostsController < ApplicationController
  before_action :set_post, only: %i[ show update destroy ]

  # GET /posts
  def index
    puts "debugging again posts#index called"
    @posts = Post.all

    render json: @posts

  # ....

Deploy again

❯ jets deploy
Deploying to Lambda demo-dev app...
06:31:11PM UPDATE_COMPLETE AWS::CloudFormation::Stack demo-dev
Stack success status: UPDATE_COMPLETE
Time took: 1m 6s
Prewarming application.
API Gateway Endpoint: https://spsfc098x8.execute-api.us-west-2.amazonaws.com/dev/

Once changes have been deployed, confirm Lambda Source code changes.

If you still have jets logs running in a terminal, you’ll see logs tailing as you’re testing.

Next, we’ll delete the project.