regions and cities requests plus tests

app/controllers/api_maxmind_requests_controller.rb

@@ -0,0 +1,23 @@
+class ApiMaxMindRequestsController < ApiController
+
+  respond_to :json
+
+  def regions
+    regions = MaxMindManager.regions(params[:country])
+    if regions && regions.length > 0
+      render :json => { :regions => regions }, :status => 200 
+    else
+      render :json => { :message => "Unrecognized Country" }, :status => 404
+    end
+  end
+
+  def cities
+    cities = MaxMindManager.cities(params[:country], params[:region])
+    if cities && cities.length > 0
+      render :json => { :cities => cities }, :status => 200
+    else
+      render :json => { :message => "Unrecognzied country or region" }, :status => 404
+    end
+  end
+
+end

config/routes.rb

@@ -150,5 +150,9 @@ SampleApp::Application.routes.draw do
     match '/join_requests/:id' => 'api_join_requests#delete', :via => :delete
     match '/join_requests' => 'api_join_requests#create', :via => :post
     match '/join_requests' => 'api_join_requests#index', :via => :get
+    
+    # Location lookups
+    match '/regions' => 'api_maxmind_requests#regions', :via => :get
+    match '/cities' => 'api_maxmind_requests#cities', :via => :get
   end
 end

lib/managers/max_mind_manager.rb

@@ -33,6 +33,27 @@ class MaxMindManager < BaseManager
     
   end
   
+  def self.regions(country)
+    ActiveRecord::Base.connection_pool.with_connection do |connection|
+      pg_conn = connection.instance_variable_get("@connection")
+      pg_conn.exec("SELECT DISTINCT region FROM max_mind WHERE country = $1 ORDER BY region ASC", [country]).map do |tuple|
+        tuple["region"]
+      end
+    end
+  end  
+  
+  
+  def self.cities(country, region)
+    ActiveRecord::Base.connection_pool.with_connection do |connection|
+      pg_conn = connection.instance_variable_get("@connection")
+      pg_conn.exec("SELECT DISTINCT city FROM max_mind WHERE country = $1 AND region = $2 ORDER BY city ASC", [country, region]).map do |tuple|
+        tuple["city"]
+      end
+    end
+  end
+  
+
+  
   
   # Do this in a transaction so there's no partial import.
   def import_database(filename)
@@ -59,6 +80,7 @@ class MaxMindManager < BaseManager
     end
   end
 
+  # Note that there's one big country, and then two cities in each region.
   def create_phony_database()
     clear_table
     (0..255).each do |top_octet|
@@ -66,14 +88,13 @@ class MaxMindManager < BaseManager
         [
           self.class.ip_address_to_int("#{top_octet}.0.0.0"),
           self.class.ip_address_to_int("#{top_octet}.255.255.255"),
-          "Country #{top_octet}",
-          "Region #{top_octet}",
+          "Country",
+          "Region #{(top_octet / 2).floor}",
           "City #{top_octet}"
-        ]).clear
+        ]).clear        
     end
   end
     
-    
   private
   
   # Make an IP address fit in a signed int. Just divide it by 2, as the least significant part

spec/managers/maxmind_manager_spec.rb

@@ -0,0 +1,36 @@
+require 'spec_helper'
+
+# these tests avoid the use of ActiveRecord and FactoryGirl to do blackbox, non test-instrumented tests
+describe MaxMindManager do
+
+
+  before(:each) do
+    @maxmind_manager = MaxMindManager.new(:conn => @conn)
+  end
+
+  it "looks up regions successfully" do
+    MaxMindManager.active_record_transaction do |manager|
+      manager.create_phony_database()
+    end
+    
+    regions = MaxMindManager.regions("Country")
+    regions.length.should == 128
+    regions.first.should == "Region 0"
+    regions.last.should == "Region 99"  # Based on sort order this will be the top.
+  end
+
+  it "looks up cities successfully" do
+    MaxMindManager.active_record_transaction do |manager|
+      manager.create_phony_database()
+    end
+    
+    cities = MaxMindManager.cities("Country", "Region 1")
+    cities.length.should == 2
+    cities.first.should == "City 2"
+    cities.last.should == "City 3"
+  end
+  
+  
+end
+
+

spec/managers/user_manager_spec.rb

@@ -55,8 +55,8 @@ describe UserManager do
 
       @user.errors.any?.should be_false
       @user.city.should == 'City 127'
-      @user.state.should == 'Region 127'
-      @user.country.should == 'Country 127'
+      @user.state.should == 'Region 63'
+      @user.country.should == 'Country'
     end