Add table for weather observation (Stacked PR)

app/models/garden.rb

@@ -9,6 +9,7 @@
 
   has_many :plantings, dependent: :destroy
   has_many :crops, through: :plantings
+  has_many :weather_observations
 
   belongs_to :garden_type, optional: true
 

app/models/weather_observation.rb

@@ -0,0 +1,16 @@
+# A weather observation is intended to be a snapshot aligned to
+# https://github.com/schemaorg/schemaorg/issues/362
+class WeatherObservation < ApplicationRecord
+  belongs_to :garden
+
+  validates :source, presence: true
+  validates :observed_at, presence: true
+
+  # Lowest temp on earth: -89.2°C (-128.6°F)
+  # Highest:  56.7°C
+  validates :dew_point_temperature_centigrade, min: -90, max: 60
+  validates :air_temperature_centigrade, min: -90, max: 60
+  validates :relative_humidity, min: 0, max: 100
+  validates :wind_speed_kmh, min: 0, max: 450 # Highest 408 km/h
+  validates :wind_gust_speed_kmh, min: 0, max: 450 # Highest 408 km/h
+end

db/migrate/20230916061712_add_weather_observations.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+class AddWeatherObservations < ActiveRecord::Migration[7.0]
+  def change
+    # See https://github.com/schemaorg/schemaorg/issues/362
+    create_table :weather_observations do |t|
+      t.string :source
+      t.datetime :observation_at
+      t.integer :solar_uv_index
+      t.decimal :wind_speed_kmh
+      t.decimal :wind_gust_speed_kmh
+      t.string :wind_direction
+      t.decimal :air_temperature_centigrade
+      t.decimal :relative_humidity
+      t.decimal :precipitation_probability
+      t.decimal :dew_point_temperature_centigrade
+      t.decimal :pressure
+      t.integer :visibility_distance_metres
+      t.string :weather_type
+      t.references :garden_id
+      t.timestamps
+    end
+  end
+end