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Lesson 1 — Setup and seeding

Update the Membership model

The memberships table already has a role integer column but the model doesn’t define the enum. Add it:

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# app/models/membership.rb
class Membership < ApplicationRecord
  belongs_to :user
  belongs_to :board

  enum :role, { member: 0, admin: 1 }, default: :member
end

This gives us membership.admin?, membership.member?, Membership.admins, Membership.members, and the role: symbol interface throughout.

Update seeds

The existing seeds file has two problems: users have no password so they can’t sign in, and Alice gets a duplicate admin membership because Board.create! already triggers add_owner_as_member.

Replace db/seeds.rb:

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# db/seeds.rb
alice = User.create!(name: "Alice Smith",  email: "alice@example.com", password: "password")
bob   = User.create!(name: "Bob Walker",   email: "bob@example.com",   password: "password")
carol = User.create!(name: "Carol Harris", email: "carol@example.com", password: "password")


# Board.create! triggers add_owner_as_member — Alice gets admin
# membership automatically. Do not add it again manually.
board = Board.create!(name: "KanbanFlow Development", user: alice)

# Add Bob and Carol as members
Membership.create!(user: bob,   board: board, role: :member)
Membership.create!(user: carol, board: board, role: :member)

todo  = board.columns.create!(name: "To Do",       position: 0)
doing = board.columns.create!(name: "In Progress", position: 1)
done  = board.columns.create!(name: "Done",        position: 2)

todo.cards.create!(title: "Set up Rails app",        position: 0)
todo.cards.create!(title: "Install Phlex",           position: 1)
todo.cards.create!(title: "Build component library", position: 2)

doing.cards.create!(title: "Build AppLayout", position: 0)
done.cards.create!(title: "Create Rails app", position: 0)

Reset and reseed:

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bin/rails db:seed:replant

db:seed:replant truncates all tables and re-seeds without re-running migrations. You now have three users — sign in as any of them with the password password.

Verify membership 

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bin/rails runner "puts Board.first.memberships.map { |m| \"#{m.user.name}: #{m.role}\" }"
# Alice: admin
# Bob: member
# Carol: member

Update BoardsController to use membership scope

Currently BoardsController#index shows owned_boards. Update it to show all boards the user is a member of — which now includes shared boards:

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def index
  render Views::Boards::Index.new(boards: current_user.boards)
end

current_user.boards uses has_many :boards, through: :memberships — it returns all boards where a membership record exists, including boards the user owns (since add_owner_as_member creates that record).

Board policy