database structure for custom aggregations in statistics

app/controllers/api/statistics_controller.rb

@@ -12,6 +12,7 @@ class API::StatisticsController < API::ApiController
         authorize :statistic, :#{path}?
         query = MultiJson.load(request.body.read)
         results = Stats::#{path.classify}.search(query, request.query_parameters.symbolize_keys).response
+        # TODO
         render json: results
       end
 

app/models/statistic_custom_aggregation.rb

@@ -0,0 +1,3 @@
+class StatisticCustomAggregation < ActiveRecord::Base
+  belongs_to :statistic_type
+end

app/models/statistic_type.rb

@@ -2,4 +2,5 @@ class StatisticType < ActiveRecord::Base
   has_one :statistic_index
   has_many :statistic_type_sub_types
   has_many :statistic_sub_types, through: :statistic_type_sub_types
+  has_many :statistic_custom_aggregations
 end

db/migrate/20160905141858_create_statistic_custom_aggregations.rb

@@ -0,0 +1,11 @@
+class CreateStatisticCustomAggregations < ActiveRecord::Migration
+  def change
+    create_table :statistic_custom_aggregations do |t|
+      t.text :query
+      t.string :path
+      t.belongs_to :statistic_type, index: true, foreign_key: true
+
+      t.timestamps null: false
+    end
+  end
+end

db/migrate/20160905142700_add_field_to_statistic_custom_aggregation.rb

@@ -0,0 +1,5 @@
+class AddFieldToStatisticCustomAggregation < ActiveRecord::Migration
+  def change
+    add_column :statistic_custom_aggregations, :field, :string
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160831084519) do
+ActiveRecord::Schema.define(version: 20160905142700) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -541,6 +541,17 @@ ActiveRecord::Schema.define(version: 20160831084519) do
   add_index "slots", ["availability_id"], name: "index_slots_on_availability_id", using: :btree
   add_index "slots", ["reservation_id"], name: "index_slots_on_reservation_id", using: :btree
 
+  create_table "statistic_custom_aggregations", force: :cascade do |t|
+    t.text     "query"
+    t.string   "path"
+    t.integer  "statistic_type_id"
+    t.datetime "created_at",        null: false
+    t.datetime "updated_at",        null: false
+    t.string   "field"
+  end
+
+  add_index "statistic_custom_aggregations", ["statistic_type_id"], name: "index_statistic_custom_aggregations_on_statistic_type_id", using: :btree
+
   create_table "statistic_fields", force: :cascade do |t|
     t.integer  "statistic_index_id"
     t.string   "key",                limit: 255
@@ -805,6 +816,7 @@ ActiveRecord::Schema.define(version: 20160831084519) do
   add_foreign_key "organizations", "profiles"
   add_foreign_key "prices", "groups"
   add_foreign_key "prices", "plans"
+  add_foreign_key "statistic_custom_aggregations", "statistic_types"
   add_foreign_key "tickets", "event_price_categories"
   add_foreign_key "tickets", "reservations"
   add_foreign_key "user_tags", "tags"

test/fixtures/statistic_custom_aggregations.yml

@@ -0,0 +1,7 @@
+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  query: '{query:{bool:{must:[range:{start_at:{gte:"2016-08-01T02:00:00+02:00", lte:"2016-09-01T02:00:00+02:00"}, match:{available_type: "machines"}}]}}}'
+  path: "/fablab/availabilities"
+  statistic_type_id: 2
+  field: "available_hours"