DEV Community: donnellycarroll

coding agent

donnellycarroll — Thu, 22 May 2025 17:49:34 +0000

https://radanskoric.com/articles/coding-agent-in-ruby

need to manually load gem files in terminal gem install dotenv when running ruby (not rails) files

Capstone notes p2

donnellycarroll — Thu, 22 May 2025 00:56:42 +0000

Writing sample data:

started with small amount from Study Buddy - need to follow "Contact Book - Our Very First Database" from AppDev1 section "custom rake tasks"

Association Accessors:

Direct Associations: belongs_to
In standard Rails applications, the default is opposite: belongs_to adds an automatic validation to foreign key columns enforcing the presence of a valid value unless you explicitly add the option optional: true.

So: if you decided to remove the null: false database constraint from any of your foreign key columns in the migration file (e.g., change t.references :recipient, null: false ... to t.references :recipient, null: true ...), then you should also add the optional: true option to the corresponding belongs_to association accessor.

So remember — if you’re ever in the situation of:

you’re trying to save a record
the save is failing
you’re doing the standard debugging technique of printing out zebra.errors.full_messages
you’re seeing an inexplicable validation error message saying that a foreign key column is blank
now you know where the validation is coming from: belongs_to adds it automatically
so figure out why you’re not providing a valid foreign key (usually it is because the parent object failed to save for its own validation reasons)

Direct associations: has_many
Each belongs_to, there should be an inverse has_many. Check to make sure you have all of these inverse 1-N associations.

attendee ~ fan
leaders = who a user is following

Capstone notes

donnellycarroll — Wed, 21 May 2025 23:49:58 +0000

Writing sample data:

started with small amount from Study Buddy - need to follow "Contact Book - Our Very First Database" from AppDev1 section "custom rake tasks"

Association Accessors:

So remember — if you’re ever in the situation of:

you’re trying to save a record
the save is failing
you’re doing the standard debugging technique of printing out zebra.errors.full_messages
you’re seeing an inexplicable validation error message saying that a foreign key column is blank
now you know where the validation is coming from: belongs_to adds it automatically
so figure out why you’re not providing a valid foreign key (usually it is because the parent object failed to save for its own validation reasons)

Direct associations: has_many
Each belongs_to, there should be an inverse has_many. Check to make sure you have all of these inverse 1-N associations.

attendee ~ fan
leaders = who a user is following

Capstone process outline

donnellycarroll — Sun, 11 May 2025 22:31:47 +0000

ERD (Entity Relationship Diagrams) using Ideas
Generate resources w/ scaffolds a. rails g resource : scaffold... b. rake db migrate then RCAV Route, Controller, Action, View
generate user accounts with Devise
add gem devise
bundle install
rails g devise:install
add root route in routes.rb i.e. root "photos#index"
generate users table rails g devise user username name .... from copilot on Ideas
look at migration file & make edits (i.e. to default values)
rake db:migrate
Generate photos/events resources with scaffold rails g scaffold event...
check migration file (i.e. t.references and default values for t.integrer :likes_count, default: 0
Check association accessor with correct foreign key column names if applicable
update migration file to point the foreign key to the correct table i.e. t.references :owner, null: false, foreign_key: { to_table: :users }
rake db:migrate
generate other tables (i.e. comments)
check migration file
check models i.e. comment.rb and user.rb
use Association Accessor app to plan out association accessor methods
Associations
Direct associations: belongs_to & has_many etc. check Ideas copilot

Indirect Associations

look at study buddy answer to second degree associations question

Validations
Sample Data

PART 2 - user interface - use ajax here

7 golden actions (autogenerated using resources :movies in routes.rb (create, new, index, show, update, edit, destroy)

View templates
Partials: _form.html.erb _navbar.html.erb

Bootstrap cards
partials i.e. _movie.html.erb
method: .to_partial_path inherited from ApplicationRecordclass

Bridges

donnellycarroll — Wed, 07 May 2025 23:04:28 +0000

Native -
Bridge components:
3 building blocks

HTML markup - where your server configures the component
The Stimulus controller subclass - where messages are passed between web and native
The native component - where Swift generates the UI and interacts with native APIs

Build new bridge:

Add the HTML markup use double dashes -- when referencing Stimulus controller --> allows us to namespace our bridge component controllers under the bridge/ directory, keeping them separate from traditional Stimulus controllers.
Create a Stimulus controller
Create a native component

Respond to Button Taps
On the web, we used send() to pass a message to native code. To pass a message _from _ native code to the web we have reply(to:).

xcode

donnellycarroll — Thu, 01 May 2025 01:31:32 +0000

Canvas editor showing SwiftUI: cmd + opt + enter

In the simulator, you can hold down the options key to create a second “finger”, which is useful for zooming in and out on the map. You can then hold down shift to “stick” them together for two-finger
scrolls.

stopped on page 114

stimulus

donnellycarroll — Thu, 01 May 2025 00:00:26 +0000

To view the browser console log, open the browser console by pressing Ctrl + Shift + J on Windows or Cmd + Option + J on a Mac

Let’s review the steps for setting up toasts:

User submits comment form (via Turbo).
Rails controller saves comment, sets flash[:notice]
Rails renders create.turbo_stream.erb
The turbo_stream.append renders the _toast.html.erb partial with the flash message
The browser receives the Turbo Stream response.
Turbo appends the new toast HTML (containing data-controller="toast") into the <div id="toasts">
Stimulus sees the new data-controller="toast" element
Stimulus initializes a new ToastController instance for this element
The controller’s connect() method runs
connect() uses Bootstrap to show() the toast
Bootstrap automatically hides the toast after 3 seconds

mac shortcuts

donnellycarroll — Wed, 30 Apr 2025 23:33:56 +0000

cmd + opt + ctrl + L arrow --> send window to different display

F6 --> next display
F5 --> previous display
F3 --> left half
F4 --> right half

cmd + space bar --> spotlight
cmd + w --> close tab
cmd + t --> new tab
cmd + n --> new window
cmd + m --> minimize window

cmd + tab --> switch application
cmd + ` --> switch window

ctrl + tab --> switch tabs

ctrl + cmd + shift + L arrow --> lower left
ctrl + cmd + L arrow --> upper left
options + cmd + c --> center

ctrl + i --> align text (in xcode)

q for ben
align text in codespaces? on mac
apply for a developer account?
why does tunnel auto reload?
can't submit forms - don't auto route? or just very slow?
can i unlock app dev 1 plz without redoing

mac shortcuts

donnellycarroll — Wed, 30 Apr 2025 00:08:09 +0000

cmd + opt + ctrl + L arrow --> send window to different display

F6 --> next display
F5 --> previous display
F3 --> left half
F4 --> right half

cmd + space bar --> spotlight
cmd + w --> close tab
cmd + t --> new tab
cmd + n --> new window
cmd + m --> minimize window

cmd + tab --> switch application
cmd + ` --> switch window

ctrl + tab --> switch tabs

ctrl + cmd + shift + L arrow --> lower left
ctrl + cmd + L arrow --> upper left
options + cmd + c --> center

ctrl + i --> align text (in xcode)

ajax to turbostream

donnellycarroll — Sun, 20 Apr 2025 23:00:03 +0000

you can run rails sample_data then bin/dev
CRUD stands for Create, Read, Update, and Delete

AJAXIFYING

When the edit icon is clicked, let’s replace the comment with an edit form, right in place.
When that form is submitted, let’s replace it with the updated comment, right in place.

For each action, you should follow the standard Ajaxification steps:

Switch the link/form from HTML to JS with remote: true and (method: :delete if it is a DELETE request) on link_to or button_to, or local: false on form_with.

Add format.js to the appropriate respond_to block.

Write a JS response template. This will usually involve:

Using or creating partials to represent the components being rendered via Ajax.
Adding top-level elements with id="" attributes to the partials, if they don’t already have them.
Writing some jQuery to select an existing element in the DOM and insert near it, replace it, etc.

Turbo_Stream

change controller to respond to turbo_stream
update partial/s
update view templates

Java notes

donnellycarroll — Wed, 16 Apr 2025 23:03:07 +0000

use let when creating variables for the first time

use const to declare a constant (unlike all caps in ruby) - can't redefine/replace value of constant in JS

lowerCamelCase i.e. iPhone

increment a value:

let x = 5;
x++;
#x is now 6

Methods that accept code: in JavaScript, these are called “anonymous functions” rather than “blocks”.
If the method provides values for block variables, in Ruby we name them within optional “pipes” | | after the do. In JavaScript, we name them within the parentheses ( ) (which are not optional) after function.

JS comparisons use triple ===, not double ==.

Beware: There’s also a JS double == (non-strict equivalence) operator. In most cases, you should use ===.

jQuery() alias $() for shorthand

In JavaScript, you have to execute the function explicitly by adding the parentheses, even if there are no arguments. ie chi.text() not chi.text

Any CSS property/value pair can be set with the css() function.

Event handlers with on()

$("body").on("click", "#bye", function() {
  $(".west").slideToggle();
});

This is saying: “Within <body>, find elements with an id of bye, and when they are clicked run the following callback.” Now, whenever the div is clicked, elements with class west will slide up and down.

Week 3 Hw notes p2

donnellycarroll — Tue, 15 Apr 2025 11:51:34 +0000

Qs:
Don't understand branches - how do you "push" back to main - I think I need this to deploy to render?

still not passing user tests - but the links work?

Cloudinary .env variables = are they supposed to be string?

security holes can be solved with:

Filters: before_action and skip_before_action. => Authorization in controller
Redirecting: redirect_to and redirect_back. => Authorization in controller
Devise’s current_user method.
Ruby’s if/else statements.
Deleting or limiting routes with only: and except: after resources.

Steps:

we ask what routes we actually want and filter them from the routes.rb with except or only
For the remaining routes, we ask who is allowed to do what on each route.

git branches:
git checkout -b ec-branch-name

Note: in this project, we implemented deterministic rather than random sample data (have a look at the lib/tasks/dev.rake file). This will make the sample data consistent in your app and the target, allowing you to repeatedly test scenarios as you code.

Step 1: Authorization in controller (only owner can delete own photos)

Step 2: Conditionals in the view templates
used to hide links that aren’t available to a given user. i.e. if a photo is not owned by someone, then they shouldn’t even see the edit or delete links

Step 3: Hiding private users: add conditional on user's show page
(If you had an Admin user, usually render two entirely separate view templates (i.e. show) to avoid excessive control flow in a single view)