Gather

The App for Community - https://info.gather.coop

Platform

Ruby on Rails applications are best developed and run on Linux, Unix, or Mac OS. Development is also possible, though not recommended, on Windows. See the Rails website for more information.

Gather is a Ruby on Rails application with some client-side JavaScript for dynamic view elements. HTML is rendered server-side. SCSS is used for styling.

Development is supported on Linux and macOS. Windows is not supported.

Quick Start

The easiest way to get started is with VS Code and Dev Containers:

1. Install Docker and VS Code
2. Install the Dev Containers extension
3. Clone and open the project:

   git clone https://github.com/gather-community/gather.git
   code gather

4. When prompted, click "Reopen in Container" (or run Dev Containers: Reopen in Container from the command palette)
5. Once the container is built, run:

   mise setup

Host Setup for Claude Code & GitHub (Dev Container)

The dev container wires up the Claude Code extension and the gh CLI using credentials and environment variables that live on your host machine, forwarded in via devcontainer.json. Docker reads these when the container is built or started, so set them up before you "Reopen in Container" — otherwise the build fails on a missing bind-mount source, or the integration comes up silently unauthenticated.

This is the only manual host setup required. SSL certificate trust and the Docker network are configured automatically by .devcontainer/setup.sh (it runs on the host as initializeCommand), and *.gatherdev.org resolves to 127.0.0.1 via public DNS — none of that needs your attention. Skip this whole section if you don't use Claude Code or gh inside the container; the app itself runs without any of it.

Claude Code

Host item	Purpose
~/.claude/.gather-devcontainer.credentials.json	Claude credentials for this dev container, kept separate from your host ~/.claude/.credentials.json. The file must exist before the first container start — Docker creates a directory in its place if it's missing, which breaks Claude Code.
~/.claude/projects (directory)	Persists Claude conversation memory per project across container rebuilds.

Create the placeholder file and directory once (Claude Code populates the credentials on first login):

mkdir -p ~/.claude/projects
touch ~/.claude/.gather-devcontainer.credentials.json

GitHub (gh CLI via GitHub App)

Inside the container, gh authenticates with a short-lived GitHub App installation token (minted by bin/gh-token, wired into a shell wrapper by .devcontainer/post-create.sh). It needs the App's ID and private key from the host:

Host env var	Purpose
GITHUB_GATHER_AI_APP_ID	The GitHub App's numeric ID (exposed in the container as GITHUB_APP_ID).
GITHUB_GATHER_AI_APP_KEY_PATH	Absolute path to the App's private-key .pem file on the host; bind-mounted to ~/.ssh/github-bot-key.pem. The file must exist or the container build fails on the missing mount source.

Add to your host shell profile (e.g. ~/.zshrc):

export GITHUB_GATHER_AI_APP_ID=123456
export GITHUB_GATHER_AI_APP_KEY_PATH="$HOME/.ssh/gather-github-app.pem"

Get the App ID and download a private key from the GitHub App's settings page (ask a maintainer for access). After exporting these and rebuilding the container, gh commands authenticate automatically.

Optional: Discourse (forum announcements)

Only needed if you use bin/post_announcement to post to the support forum. These host env vars are forwarded into the container — set them in your host shell profile if you need them:

export DISCOURSE_BASE_URL=https://support.forum.gather.coop
export DISCOURSE_BOT_API_KEY=...
export DISCOURSE_BOT_USERNAME=Gather_Bot
export DISCOURSE_ANNOUNCEMENTS_CATEGORY_ID=...

System Dependencies

We recommend using mise for managing tool versions and running configuration tasks. The project includes a mise.toml that installs Ruby, Node.js, and other required tools automatically.

Required Tools

Tool	Purpose
Ruby (see .ruby-version)	Application runtime
Node.js (see .nvmrc)	JavaScript tooling
libvips 8.8+	Image processing

Optional Tools

Tool	Purpose
Docker	Only required if using the repo's compose.yml for data services
Mailcatcher	Email testing (gem install mailcatcher)
Mailman 3	Mailing list integration (see below)

Setup Stages

Run individual setup stages with:

mise deps    # Check dependencies
mise conf    # Generate configuration
mise data    # Setup data services and database
mise ssl     # Configure SSL certificates

The mise data stage will create an admin user for development. If you need to reset the admin password later, run mise data again and select "Reset super admin password".

Running the Application

1. Start data services (PostgreSQL, Redis, Elasticsearch):

   docker compose up -d

   If you're using your own data services, ensure they're running and configured in config/database.yml and config/settings.local.yml. The mise data task will attempt to start Docker Compose services if it can't connect to the configured hosts.

2. Run tests to verify everything is working:

   bundle exec rspec

3. Start the application:

   bin/dev           # Start Rails server with foreman
   bin/delayed_job run  # Start background job processor (separate terminal)

   Job logs go to log/development.log. The log/delayed_job.log file contains only initialization and job state information.

Running Multiple Dev Envs

Multiple clones of the repo (e.g. gather1, gather2) can run simultaneously on the same machine. Each gets its own isolated Docker network and database, named after the workspace folder.

Each new instance adds about 3 GB of memory. Ensure your Docker is configured to allow this.

How isolation works

The devcontainer joins a network named <folder>-network (e.g. gather2-network). Docker services started by docker compose up -d join the same network, so the devcontainer can reach them by hostname (postgres, redis, elasticsearch, mailman-core) without any host port bindings. Services in different instances are on separate networks and cannot see each other.

┌──────────────────────────────── Mac Host ──────────────────────────────────────────────┐
│                                                                                         │
│   Browser      :3000 ◄── VS Code (process-detect)    :1080 :8000 ◄── Docker host bind  │
│                      (one dev env at a time)           (opt-in, one dev env at a time)  │
│                          │                                │      │                       │
└──────────────────────────┼────────────────────────────────┼──────┼─────────────────── ─ ┘
                           │                                │      │
     ┌─────────────────────┼──── gather1-network ───────────┼──────┼─────────────────┐
     │                     │                                │      │                 │
     │  ┌──────────────────▼────────────────────┐  ┌───────▼──┐ ┌─▼───────────┐    │
     │  │        gather1 devcontainer            │  │mailcatch │ │ mailman-web │    │
     │  │   Rails :3000    Selenium :4444        │  │:1025/1080│ │    :8000    │    │
     │  └──────────────────────────────────────┘  └──────────┘ └─────────────┘    │
     │  postgres:5432  redis:6379  elasticsearch:9200  mailman-core:8001           │
     └───────────────────────────────────────────────────────────────────────────────┘

     ┌──────────────────────── gather2-network ─────────────────────────────────────────┐
     │                                                                                   │
     │  ┌──────────────────────────────────────┐  ┌──────────┐ ┌─────────────┐         │
     │  │        gather2 devcontainer           │  │mailcatch │ │ mailman-web │         │
     │  │   Rails :3000    Selenium :4444       │  │:1025/1080│ │    :8000    │         │
     │  └──────────────────────────────────────┘  └──────────┘ └─────────────┘         │
     │  postgres:5432  redis:6379  elasticsearch:9200  mailman-core:8001                │
     └─────────────────────────────────────────────────────────────────────────────────┘

All dev envs are symmetrical — no host port bindings for any service. The devcontainer is on the same Docker network, so services are reachable by hostname (psql -h postgres, redis-cli -h redis, etc.) from the devcontainer terminal without any host bindings.

Rails on :3000 runs inside the devcontainer. VS Code detects the process binding and forwards it to the host automatically (remote.autoForwardPortsSource: "process" in devcontainer.json).

Setting up a secondary instance

Replacing N with a unique suffix of your choice, run:

git clone https://github.com/gather-community/gather.git gatherN
cd gatherN
code .

Inside the container, run:

mise setup

Tearing down a dev env

To fully remove a dev environment and free up all its Docker resources, run from your Mac terminal in the project directory:

bin/teardown

This removes:

• All Docker Compose services and their data volumes (postgres, redis, elasticsearch, mailcatcher, mailman-*)
• The devcontainer
• The gem bundle volume (<name>-bundle)
• The Docker network (<name>-network)
• The entire gatherN directory

Checking for port conflicts

bin/dev checks automatically whether port 3000 is already claimed before starting Rails. If another dev env owns it, you'll see which one and be told to stop it first.

Exposing sibling container UIs

Mailcatcher and the Mailman web UI are sibling containers — VS Code can't port-forward them. When you need to view one in a browser, run:

bin/mailcatcher       # http://localhost:1080  (SMTP: localhost:1025)
bin/mailman-web       # http://localhost:8000

This recreates that container with a host port binding. If another dev env already has that port bound, the script will report which container owns it and how to stop it. Only one dev env can expose each service at a time.

To remove the binding when done:

bin/mailcatcher stop
bin/mailman-web stop

Secrets & Configuration

Gather does not use Rails encrypted credentials. Secrets are managed through two files:

config/settings.local.yml (gitignored, generated by mise conf from the template at config/templates/settings.local.yml). Add any local overrides and secrets here.

Never commit secrets to the repository. When adding a new secret, document it with a blank value in config/templates/settings.local.yml (this file is checked in) so other developers know what to configure.

Rails Console

When using the Rails console, set a tenant first:

CH.tenant(1)  # Use Community ID 1

Common Shortcuts

Short scripts in bin/ for frequent tasks:

bin/c    # rails console
bin/db   # rails dbconsole (psql)
bin/dm   # db:migrate
bin/dr   # db:rollback (accepts STEP=n)
bin/dmr  # db:migrate:redo (accepts STEP=n)

Caching

Caching is off by default in development. Enable temporarily with:

CACHE=1 rails server

Linters

We use eslint, rubocop, and scss_lint. The CI system enforces these—PRs won't be approved until issues are resolved.

Troubleshooting

Elasticsearch 403 Errors

Reset the index:

rails console -e development
Work::Shift.__elasticsearch__.create_index!(force: true)

To re-populate after resetting:

ActsAsTenant.current_tenant = Cluster.find(...)
Work::Shift.find_each { |s| s.__elasticsearch__.index_document }

Mailman 3 Setup

Only required if working on mailing list integration.

Mailman runs as two Docker containers (mailman-core and mailman-web) included in docker-compose.yml. Running mise data (or docker compose up -d) starts them alongside the other services. A Postorius admin account is created automatically with username admin and password gather-mailman-dev.

Inspecting list state (Postorius web UI)

Run bin/mailman-web first to bind port 8000, then visit http://localhost:8000/postorius/ and log in with the superuser you created above. From here you can browse domains, lists, and memberships.

Inspecting list state (REST API)

All REST API calls use HTTP Basic auth with restadmin / restpass. Run these from inside the devcontainer using mailman-core as the hostname (mailman-core has no host port binding, so these commands won't work from the Mac terminal).

# List all mailing lists
curl -u restadmin:restpass http://mailman-core:8001/3.1/lists

# Show a specific list (replace list@domain with the actual address)
curl -u restadmin:restpass http://mailman-core:8001/3.1/lists/list@domain

# Show all members of a list
curl -u restadmin:restpass "http://mailman-core:8001/3.1/lists/list@domain/roster/member?count=100&page=1"

# Show nonmembers (allowed senders) of a list
curl -u restadmin:restpass "http://mailman-core:8001/3.1/lists/list@domain/roster/nonmember?count=100&page=1"

# Show a specific membership by ID
curl -u restadmin:restpass http://mailman-core:8001/3.1/members/MEMBER_ID

Making modifications (REST API)

# Add a member to a list
curl -u restadmin:restpass -X POST http://mailman-core:8001/3.1/members \
  -d "list_id=list.domain&subscriber=user@example.com&role=member&pre_verified=true&pre_confirmed=true&pre_approved=true"

# Update a membership (e.g. set moderation_action to accept)
curl -u restadmin:restpass -X PATCH http://mailman-core:8001/3.1/members/MEMBER_ID \
  -d "moderation_action=accept"

# Delete a membership
curl -u restadmin:restpass -X DELETE http://mailman-core:8001/3.1/members/MEMBER_ID

# Update list settings
curl -u restadmin:restpass -X PATCH http://mailman-core:8001/3.1/lists/list@domain/config \
  -d "advertised=false"

Viewing logs

docker logs mailman-core        # Mailman core logs (REST API, delivery, errors)
docker logs mailman-web         # Postorius web UI logs
docker logs -f mailman-core     # Follow logs in real time

Dropping into a shell

docker exec -it mailman-core bash

VS Code

When using Dev Containers, extensions and settings are installed and configured automatically.

If working locally without a Dev Container, install these recommended extensions:

Ruby/Rails:

• Shopify.ruby-lsp - Ruby language server
• Shopify.ruby-extensions-pack - Ruby extensions pack
• KoichiSasada.vscode-rdbg - Ruby debugger
• rubocop.vscode-rubocop - RuboCop linting
• aliariff.vscode-erb-beautify - ERB formatting

JavaScript/TypeScript:

• dbaeumer.vscode-eslint - ESLint
• esbenp.prettier-vscode - Prettier formatting
• marcoroth.stimulus-lsp - Stimulus (Hotwire) support
• bradlc.vscode-tailwindcss - Tailwind CSS

Utilities:

• hverlin.mise-vscode - mise integration
• ckolkman.vscode-postgres - PostgreSQL client
• ms-azuretools.vscode-docker - Docker support
• foxundermoon.shell-format - Shell script formatting
• timonwong.shellcheck - Shell script linting
• EditorConfig.EditorConfig - EditorConfig support

Recommended settings (.vscode/settings.json):

{
  "editor.tabSize": 2,
  "editor.formatOnSave": true,
  "editor.defaultFormatter": "esbenp.prettier-vscode",
  "[ruby]": {
    "editor.defaultFormatter": "Shopify.ruby-lsp"
  },
  "[erb]": {
    "editor.defaultFormatter": "aliariff.vscode-erb-beautify"
  },
  "[shellscript]": {
    "editor.defaultFormatter": "foxundermoon.shell-format"
  },
  "files.associations": {
    "*.html.erb": "erb"
  }
}

Acknowledgements

This project is happily tested with BrowserStack!