psql_array_strong_parameters.rb

# Simple :
# params[:user][:tags] = ["tag1", "tag2"]
user.update!(user_params)

# Ou encore :
user.tags = ["tag1", "tag2"]
user.save!

# Beau
def user_params
  params.require(:user).permit(
    :email,
    # ...
    tags: []
  )
end

# Moche
def user_params
  params.require(:user).permit(
    { tags: [] },
    :email,
    # ...
  )
end