Sails Waterline SQL join in populate

Question

Does Waterline have any support for performing SQL joins (aside from query())? I've set up the associations in my models, but the actual SQL queries that are generated are looping select statements. Is there currently only support for "n+1 selects"? Am I missing a configuration option somewhere?

Here is an example of a 1->Many populate that is looping select statements: (sails/waterline/sails-mysql v0.10.0-rc8)

/**
* City.js
*/
module.exports = {
"adapter": "someMysqlServer",
"tableName": "city",
autoCreatedAt: false,
autoUpdatedAt: false,
schema: true,
attributes: {
    "id": {
        "type": "integer",
        "primaryKey": true,
        "autoIncrement": true,
        "columnName": "ID"
    },
    "Name": {
        "type": "string",
        "maxLength": 35
    },
    "District": {
        "type": "string",
        "maxLength": 20
    },
    "Population": {
        "type": "integer"
    },
    "CountryCode": {
        //a city has one country
        "model": "Country"
    }
}};




/**
* Country.js
*/

module.exports = {
  "adapter": "someMysqlServer",
  "tableName": "country",
  autoCreatedAt: false,
  autoUpdatedAt: false,
  schema: true,
  attributes: {
      "id": {
          "type": "string",
          "required": true,
          columnName: "Code",
          "primaryKey": true,
          "maxLength": 3
      },
      "Name": {
          "type": "string",
          "maxLength": 52
      },
      Continent: "string",
      "Region": {
          "type": "string",
          "maxLength": 26
      },
      SurfaceArea: "float",
      IndepYear: "integer",
      Population: "integer",
      LifeExpectancy: "float",
      GNP: "float",
      GNPOld: "float",
      LocalName: "string",
      GovernmentForm: "string",
      HeadOfState: "string",
      Capital: "integer",
      Code2: "string",
      Cities: {
          //country has many cities
          "collection": "City",
          "via": "CountryCode"
      }
  }
};

Then when I navigate to http://localhost:1337/country?populate=[Cities] my logs show the following sql was executed:

SELECT `country`.`Name`, `country`.`Continent`, `country`.`Region`, `country`.`SurfaceArea`, `country`.`IndepYear`, `country`.`Population`, `country`.`LifeExpectancy`, `country`.`GNP`, `country`.`GNPOld`, `country`.`LocalName`, `country`.`GovernmentForm`, `country`.`HeadOfState`, `country`.`Capital`, `country`.`Code2`,`country`.`Code` FROM `country` LIMIT 30 OFFSET 0
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='ABW' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='AFG' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='AGO' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='AIA' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='ALB' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='AND' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='ANT' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='ARE' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='ARG' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='ARM' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='ASM' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='ATA' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='ATF' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='ATG' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='AUS' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='AUT' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='AZE' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BDI' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BEL' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BEN' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BFA' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BGD' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BGR' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BHR' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BHS' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BIH' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BLR' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BLZ' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BMU' LIMIT 30
SELECT `city`.`Name`, `city`.`CountryCode`, `city`.`District`, `city`.`Population`, `city`.`ID` FROM `city` WHERE `city`.`CountryCode`='BOL' LIMIT 30

Answer 1

The .populate() implementation in beta is deliberately simplified to support the broadest possible set of adapters. In the final v0.10 release, the supported "core" SQL adapters (sails-mysql and sails-postgresql) will do actual joins.