We have one working endpoint

app/assets/javascripts/api.coffee

@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/api.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the api controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/api_controller.rb

@@ -0,0 +1,16 @@
+class ApiController < ApplicationController
+  def create
+    j = JSON.parse params[:json]
+
+    k = {}
+    k['datetime'] = j['datetime']
+    k['value'] = j['value']
+
+    g = GlucoseMeasurement.new k
+    if g.save
+      render json: g, status: :ok
+    else
+      render json: k, status: 400
+    end
+  end
+end

app/helpers/api_helper.rb

@@ -0,0 +1,2 @@
+module ApiHelper
+end

config/routes.rb

@@ -2,7 +2,8 @@
   resources :glucose_measurements, path: 'glucose'
   resources :medication_events, path: 'meds'
   resources :carbohydrate_intakes, path: 'carbs'
-  resources :physical_exercises, path: 'exercise' 
+  resources :physical_exercises, path: 'exercise'
+  resources :api
 
   root 'welcome#index'
 end

dirty_hacky_script.rb

@@ -0,0 +1,15 @@
+require 'xmlsimple'
+require 'json'
+
+data = XmlSimple.xml_in File.read 'spec/support/fixtures/incoming.xml'
+
+r = data['record']
+r.sort! { |x, y| x['datetime'] <=> y['datetime'] }
+
+r.each do |datum|
+  datum.each_pair do |k, v|
+    datum[k] = v[0]
+  end
+end
+
+puts r

spec/controllers/api_controller_spec.rb

@@ -0,0 +1,30 @@
+describe ApiController, type: :controller do
+  describe 'POST #create' do
+    context 'with valid attributes' do
+      it 'creates a new glucose measurement' do
+        expect {
+          post :create, json:
+          {
+            "id":"3648",
+            "datetime":"2016-01-30T13:58:31+00:00",
+            "type":"Glucose",
+            "subtype"=>{},
+            "category":"Lunch",
+            "value":"12.0"
+          }.to_json
+        }.to change(GlucoseMeasurement, :count).by 1
+      end
+
+      it 'fails with duff values' do
+        expect {
+          post :create, json:
+          {
+            "datetime":"2016-01-30T13:58:31+00:00",
+            "type":"Glucose",
+            "value":"0"
+          }.to_json
+        }.to_not change(GlucoseMeasurement, :count)
+      end
+    end
+  end
+end

spec/helpers/api_helper_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+# Specs in this file have access to a helper object that includes
+# the ApiHelper. For example:
+#
+# describe ApiHelper do
+#   describe "string concat" do
+#     it "concats two strings with spaces" do
+#       expect(helper.concat_strings("this","that")).to eq("this that")
+#     end
+#   end
+# end
+RSpec.describe ApiHelper, type: :helper do
+  pending "add some examples to (or delete) #{__FILE__}"
+end

spec/support/fixtures/incoming.json

@@ -0,0 +1,6 @@
+{"datetime":"2016-01-29T19:18:29+00:00","category":"Dinner","value":"12.0"}
+{"datetime":"2016-01-29T19:33:12+00:00","category":"Dinner","value":"14.0"}
+{"datetime":"2016-01-30T01:40:18+00:00","category":"Bedtime","value":"21.6"}
+{"datetime":"2016-01-30T01:46:26+00:00","category":"Bedtime","value":"14.0"}
+{"datetime":"2016-01-30T10:26:03+00:00","category":"Breakfast","value":"10.7"}
+{"datetime":"2016-01-30T10:39:25+00:00","category":"Breakfast","value":"6.0","subtype":"humalog"}

spec/support/fixtures/incoming.xml

@@ -0,0 +1,58 @@
+<ontrack>
+  <record>
+      <id>3649</id>
+      <datetime>2016-01-30T14:05:00+00:00</datetime>
+      <type>Medication</type>
+      <subtype>Humalog</subtype>
+      <category>Lunch</category>
+      <value>6.0</value>
+  </record>
+  <record>
+      <id>3648</id>
+      <datetime>2016-01-30T13:58:31+00:00</datetime>
+      <type>Glucose</type>
+      <subtype></subtype>
+      <category>Lunch</category>
+      <value>12.0</value>
+  </record>
+  <record>
+      <id>3647</id>
+      <datetime>2016-01-30T10:39:25+00:00</datetime>
+      <type>Medication</type>
+      <subtype>Humalog</subtype>
+      <category>Breakfast</category>
+      <value>6.0</value>
+  </record>
+  <record>
+      <id>3646</id>
+      <datetime>2016-01-30T10:26:03+00:00</datetime>
+      <type>Glucose</type>
+      <subtype></subtype>
+      <category>Breakfast</category>
+      <value>10.7</value>
+  </record>
+  <record>
+      <id>3645</id>
+      <datetime>2016-01-30T01:46:26+00:00</datetime>
+      <type>Medication</type>
+      <subtype>Lantus</subtype>
+      <category>Bedtime</category>
+      <value>14.0</value>
+  </record>
+  <record>
+      <id>3644</id>
+      <datetime>2016-01-30T01:40:18+00:00</datetime>
+      <type>Glucose</type>
+      <subtype></subtype>
+      <category>Bedtime</category>
+      <value>21.6</value>
+  </record>
+  <record>
+      <id>3643</id>
+      <datetime>2016-01-29T19:33:12+00:00</datetime>
+      <type>Medication</type>
+      <subtype>Humalog</subtype>
+      <category>Dinner</category>
+      <value>14.0</value>
+  </record>
+</ontrack>