member: membership dependent destoy

app/models/user.rb

 
   has_many :tasks, foreign_key: 'owner_id', class_name: 'Task'
   
-  has_many :memberships, foreign_key: :member_id
+  has_many :memberships, foreign_key: :member_id, dependent: :destroy
   has_many :teams, through: :memberships
   
   has_secure_password

db/seeds.rb

 User.create(username: "admin", email: "admin@email.com", password: "azerty", is_admin: true)
 puts "Created Admin"
 
-60.times do |i|
+30.times do |i|
   task = Task.create(
     name: Faker::Verb.ing_form,
     description: Faker::Fantasy::Tolkien.poem,