Connect database successfully & Solve the problem of creating constant having “::” within its name

lib/weather-model.rb

 require 'weather-model/version'
 
 module WeatherModel
-  require 'weather-model/source_schema'
-  def self.create_classes
-    Weather::Model::SourceSchema.each do |source|
-      Object.const_set("#{source}::Mysql", Class.new(Source::Mysql))
-      Object.const_set("#{source}::Ohm", Class.new(Source::Ohm))
+
+  Dir[File.dirname(__FILE__) + '/weather-model/*.rb'].each { |file| require file }
+
+  def self.included base
+    WeatherModel::SourceSchema.sorts.each { |sort| Object.const_set(sort, Module.new)}
+    WeatherModel::SourceSchema.constants.each do |source|
+      settings = SourceSchema.const_get(source)
+      Object.const_get(settings[:sort]).const_set("#{source.to_s.gsub('_', '::')}", Class.new(Storer::Mysql)).use_settings(settings)
     end 
   end
 end

lib/weather-model/engine.rb

 module WeatherModel
-  class Engine < Rails::Engine
+  require 'rails/engine'
+  class Engine < ::Rails::Engine
   end
 end
\ No newline at end of file

lib/weather-model/source_schema.rb

 module WeatherModel
   module SourceSchema
+
+    def self.sorts
+      ['Forecast']
+    end
+
     ShanghaiTen = {
+      sort: 'Forecast',
       table_name: :forecasts,
       schema: {
         datetime: :datetime,

lib/weather-model/storer.rb

 module WeatherModel
   module Storer
-    class Mysql < ActiveRecord::Base
-      @@source = self.name[0..-8]
-
-      @@settings = Source::Schema.const_get(self.name[0..-8])
-      
-      self.table_name = @@settings[:table_name]
-    end
-
-    class Ohm < Ohm::Model
+    require 'active_record'
+    require 'ohm'
     require "ohm/expire"
-      include Ohm::Expire
-      TTL = 5
 
-      attribute Schema.keys
-      [:index, :unique].each do |x|
-        method(x).call Schema::Setting[x]
+    class Mysql < ::ActiveRecord::Base
+      after_save :update_ohm
+      def self.use_settings settings
+        self.table_name = settings[:table_name]
+        Ohm.use_settings settings
       end
 
-      expire TTL
+      class Ohm < ::Ohm::Model
+        def self.use_settings settings
+          include ::Ohm::Expire
+          # TTL = 5
+          # attribute :mysqlid
+          settings.keys.each { |x|
+            attribute x
+          }
+          [:index, :unique, :expire].each do |x|
+            method(x).call settings[x]
+          end
+          # expire TTL
+        end
 
       private
         def son his_son # input like :Post
@@ -31,5 +36,13 @@ module WeatherModel
           reference(his_dad.to_s.underscore.to_sym, his_dad )if his_dad SourceSchema.const_defined?(his_son)
         end
       end
+    private
+      def update_ohm
+        # Ohm.create()
+      end   
+    end
+
+
+   
   end
 end

spec/spec_helper.rb

 require "bundler/setup"
-require "weather/model"
+require "weather-model"
+require 'rails'
 
 RSpec.configure do |config|
   # Enable flags like --only-failures and --next-failure

spec/weather-model_spec.rb

 require "spec_helper"
 require 'active_record'
+require "ohm"
+
 RSpec.describe WeatherModel do
-  it "has a version number" do
-    expect(WeatherModel::VERSION).not_to be nil
-  end
+  include WeatherModel
 
-  it "does something useful" do
-    expect(false).to eq(true)
+  # start an ohm
+  Ohm.redis = Redic.new("redis://127.0.0.1:6379")
+  # run migration
+  Dir[File.dirname(__FILE__) + '/../db/migrate/*.rb'].each { |file| require  file }
+  ActiveRecord::Base.establish_connection(
+    :adapter => 'sqlite3',
+    :database => 'weather-model-test.sqlite3'
+  )
+  ActiveRecord::Migration[5.0].subclasses.each do |migrate|
+    migrate.migrate rescue nil
   end
 
-  # before do
+  it "has a version number" do
+    expect(WeatherModel::VERSION).not_to be nil
+  end
 
-  #   # Dir['db/migrate/*.rb'].each { |file| require '../' + file }
+  it 'Forecast' do
+p Forecast::ShanghaiTen.all
 
-  #   ActiveRecord::Base.establish_connection(
-  #     :adapter => 'sqlite3',
-  #     :database => 'weather-model-test.sqlite3'
-  #   )
-  #   CreateForecasts.migrate(:up)
-  # end
+  end
 end

weather-model.gemspec

@@ -42,4 +42,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler", "~> 1.14"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec", "~> 3.0"
+  spec.add_development_dependency "sqlite3"
+  spec.add_development_dependency 'rspec-rails'
 end