Adds findByAssociation to extendsTo (#314)

lib/Associations/Extend.js

@@ -40,6 +40,42 @@ exports.prepare = function (db, Model, associations, association_properties, mod
 
 		associations.push(association);
 
+		Model["findBy" + assocName] = function () {
+			var cb = null, conditions = null, options = {};
+
+			for (var i = 0; i < arguments.length; i++) {
+				switch (typeof arguments[i]) {
+					case "function":
+						cb = arguments[i];
+						break;
+					case "object":
+						if (conditions === null) {
+							conditions = arguments[i];
+						} else {
+							options = arguments[i];
+						}
+						break;
+				}
+			}
+
+			if (conditions === null) {
+				throw ErrorCodes.generateError(ErrorCodes.PARAM_MISMATCH, ".findBy(" + assocName + ") is missing a conditions object");
+			}
+
+			options.__merge = {
+				from  : { table: association.model.table, field: Object.keys(association.field) },
+				to    : { table: Model.table, field: Model.id },
+				where : [ association.model.table, conditions ],
+				table : Model.table
+			};
+			options.extra = [];
+
+			if (typeof cb == "function") {
+				return Model.find({}, options, cb);
+			}
+			return Model.find({}, options);
+		};
+
 		return association.model;
 	};
 };

test/integration/association-extend.js

@@ -212,4 +212,37 @@ describe("Model.extendsTo()", function() {
 			});
 		});
 	});
+
+	describe("findBy()", function () {
+		before(setup());
+
+		it("should throw if no conditions passed", function (done) {
+			(function () {
+				Person.findByAddress(function () {});
+			}).should.throw();
+
+			return done();
+		});
+
+		it("should lookup in Model based on associated model properties", function (done) {
+			Person.findByAddress({
+				number: 123
+			}, function (err, people) {
+				should.equal(err, null);
+				should(Array.isArray(people));
+				should(people.length == 1);
+
+				return done();
+			});
+		});
+
+		it("should return a ChainFind if no callback passed", function (done) {
+			var ChainFind = Person.findByAddress({
+				number: 123
+			});
+			ChainFind.run.should.be.a("function");
+
+			return done();
+		});
+	});
 });