Rails 5.1.: strong params for JSON POST request - ruby-on-rails

Question

I have JS where data are posted with Ajax and in terminal my params look like this:
Started POST "/strongbolt/user_groups" for 10.0.2.2 at 2017-06-27 16:27:23 +0000
Processing by Strongbolt::UserGroupsController#create as JSON
Parameters: {"strongbolt_user_group"=>{"name"=>"Some test group",
"description"=>"Some test description", "user_ids"=>{"0"=>{"id"=>"3"},
"1"=>{"id"=>"2"}, "2"=>{"id"=>"5"}}, "role_ids"=>{"0"=>{"id"=>"1"},
"1"=>{"id"=>"2"}}}}
My Create action looks like this:
def create
user_roles #Helper method
#user_group = Strongbolt::UserGroup.create!(user_group_params)
respond_to do |format|
format.js { flash.now[:notice] = "User group #{#user_group.name} created!" }
format.json { render json: {
data: #user_group.as_json(only: [:id, :name, :description], include: {
users: { only: [:id, :name] }, roles: {only: [:id, :name] }}),
}
}
end
end
private
def user_group_params
params.require(:strongbolt_user_group)
.permit(:name, :description, {user_ids: []}, {role_ids: []})
end
In my terminal I can see it create name and description, but does not insert user_ids and role_ids. So far I've been trying differently with params, but no luck - can't make them to be saved.
I get this error: Unpermitted parameters: :user_ids, :role_ids
How do I make all params to be saved, please? Thank you!

Answer 1

instead of
{
"strongbolt_user_group"=>{
"name"=>"Some test group",
"description"=>"Some test description",
"user_ids"=>{"0"=>{"id"=>"3"}, "1"=>{"id"=>"2"}, "2"=>{"id"=>"5"}},
"role_ids"=>{"0"=>{"id"=>"1"}, "1"=>{"id"=>"2"}}
}
}
you should send
{
"strongbolt_user_group"=>{
"name"=>"Some test group",
"description"=>"Some test description",
"user_ids"=>["3", "2", "5"],
"role_ids"=>["1", "2"]
}
}
EDIT
If you can't change the format of received params, you could do something like the following:
private
def user_group_params
modified_params.require(:strongbolt_user_group)
.permit(:name, :description, {user_ids: []}, {role_ids: []})
end
def modified_params
user_ids = params[:strongbolt_user_group][:user_ids].values.map(&:values).flatten
role_ids = params[:strongbolt_user_group][:role_ids].values.map(&:values).flatten
ActionController::Parameters.new({
strongbolt_user_group: params[:strongbolt_user_group].except(:user_ids, role_ids).merge(user_ids: user_ids, role_ids: role_ids)
})
end