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Paulo Daniel Carneiro
Hi @PauloDanielCarneiro
Nice to meet you..
Jonathan Hill
how does one require a gem not in the Gemfile? and, I have no source access to the actual rails code I"m running...
This message was deleted

Hi guys! I'm trying to understand the magic of the preview mailer.
Can anybody give me a hint?
How this

url_for(controller: "mailers", action: "preview", path: "#{preview.preview_name}/#{email}")

becomes this ?


Routes are registered somehow but I cannot find how/where.

Thank you in advance! 🙂

1 reply
Andrea Schiavini
hi all, I'm struggling to find a solution for an ActionDispatch::Cookies::CookieOverflow error, raised when the app is trying to store too much data inside a session via the ransack memory gem.
this exception happens in ActionDispatch land, so it's not rescuable via rescue_from, and no, changing the session store to ActiveRecord just for this is not viable
I could write some mitigation logic, trying to guess a maximum size for ransack memory, but it would largely depend on what else is in the session and I'd prefer to write code to handle the exception (clearing session data and redirecting the user back to the root)
has anybody got any hint about what to do in such a situation?
Hello, I'm struggling to integrate the lighthouse with Rails.
There is no index.html in static assets files.
almokhtar bekkour
create one @Seif-apprentus
Amisha Shukla
What can be the possible reasons of data not adding up in the table other than validations?
Patrick Collins
Hi everyone... webpacker's v6 upgrade guide says: "Remove overlapping dependencies from your package.json and rails/webpacker's package.json." ... so I removed those, and I see webpacker's package.json specifies "@babel/plugin-proposal-class-properties": "^7.14.5", ... yet when I run webpack, now I get Error: Cannot find module '@babel/plugin-proposal-class-properties'
1 reply
Jordan Shackelford
Does anyone know how to host subfolders on heroku?
Like I don't want to deploy the whole git repo, just a sub folder
Daniel Wilkowski
@JordanShackelford You could make a read-only repository on github, that's a copy of a folder from your real repository, and host that on Heroku.


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Didrik Birkemalm
Can someone help me understand how I can include leaflet in a Rails7 app with importmap?
backward crazy mage puppy 36
Hi, does anyone know how to enable yjit for rails application ?
@backward-crazy-mage-puppy-36 I know
Zipho Mashologu
Hi, I have a question here, I am trying to upgrade from 6.1.6 to 7.0.0.alpha1 & hitting a migration issue. NoMethodError: undefined method `key?' for nil:NilClass - is that familiar to someone here? Thanks in advance.
Lucas M.R.
Hi, does anyone know if there is a package in python where I can create models similar to what Ruby on rails does with Rails Generator? How:
$ rails generate Controller mycontroller
@zipho while researching something else, i kept seeing problems with early rails 7, and the answer was to install rails 7.0.3. the way to be safe about making such a jump would be to arrive here for the gemhttps://rubygems.org/gems/rails/versions/7.0.3
@zipho arrive here for the changelog from where you are to 7.0.3 .. see if your code is affected, if so, make needed change(s) : https://github.com/rails/rails/releases .. hope that helps
Zipho Mashologu
thanks @kathyonu - i had some redundant migration script that was tripping me.
Marcos Koby
rails question here. There is an association I need to modify, so that child model needs to remain after a parent model gets deleted.
How might I generate a migration so that in postrgresql, a foreign_key changes to 'ON DELETE SET NULL' ?

@klepsydra: Hello and welcome !

You can specify it on the relation declaration, in the parent model: has_many :<children>, dependent: :nullify

the foreign key field should be nullable at the database level for this to work
Marcos Koby

Thanks @mtancoigne:matrix.org . I wrote a migration.rb file by hand:

 def change
    remove_foreign_key :babies, :parents 

    change_column :babies, :parent_id, :uuid, null: true  

    add_foreign_key "babies", "parents", on_delete: :nullify   

I couldn't figure out if rails generate migration had some options to do this from a shell command.

I don't know either; I always write migrations by hand
Daniel Wilkowski
You guys like OO?

Hi All,

I am new to ruby on rails, while running bundle install on centos vm getting the below error

An error occurred while installing msgpack (1.5.2), and Bundler cannot continue.

In Gemfile:
bootsnap was resolved to 1.12.0, which depends on

Can anyone let me know if you have any solution for this error
Anshul Riyal
@Udhayakumarpt I usually had something similar while working on window or ruby version dependency issues.. Try changing ruby version. Let me me know if that helps🤞
1 reply
HI All, I am working with ruby in Rspec and getting bootsnap error .can anyone help me to fix it.
@anshulriyal_gitlab thanks for the solution
Do any of you have pdf or epub of ruby on rails tutorial 7th version. I have tried a lot of private trackers but couldn't find anything
Kazuya Nomura
Hello everyone
Hope you are spending good weekend.
I am newbie to here.
Is there any good guide for ruby, ruby on rails beginner?
1 reply
Thank you. @Anshul Riyal
I'd like to readable tutorials
@eswarishanmugam Have you sorted it out yet?
If not, desribe the error/problem.