Ruby on rails 控制器创建新参数

Question

In create method in controller i have:

def create
      @monitoring_group = MonitoringGroup.new(monitoring_group_params)
        if @monitoring_group.save
          payload = {
              value: @monitoring_groups,
              status: 201
          }
          render json: @monitoring_group, status: :created#, location: @monitoring_group
        else
          payload = {
              error: "One or more monitorings do not belong to this account",
              status: 400
          }
          render :json => payload, :status => :bad_request
        end
    end

And

 def monitoring_group_params
   params.require(:monitoring_groups).permit(:name, monitoring: [])
 end

I have the answer when i run the create

> #<ActionController::ParameterMissing: param is missing or the value is empty: monitoring_groups>

What i do to this create ?

Answer 1

What does the request look like?

The action expects an object like so:

{
  "monitoring_groups": {
    "name":"Some name",
    "monitoring":[]
  }
}

Are you adding the outer monitoring_groups key?

Also look at the development.log -> it will log the incoming request.

Answer 2

You have params.require(:monitoring_groups) . This means that the params object expects data nested under the :monitoring_groups key.

If the request is coming from an HTML form, you should have something like this there:

form_for MonitoringGroup.new do |form|
  ...
end