Proper ExcludeConstraintError details handling

Error constructor is now being exposed to the global Sequelize object
Some tests for the error are added as well

lib/dialects/postgres/query.js

@@ -344,43 +344,19 @@ module.exports = (function() {
 
         break;
       case '23P01':
-        // there are multiple different formats of error messages for this error code
-        // this regex should check at least two
         match = errDetail.match(/Key \((.*?)\)=\((.*?)\)/);
 
-        if (match) {
-          fields = Utils._.zipObject(match[1].split(', '), match[2].split(', '));
-          errors = [];
-          message = 'Validation error';
+        fields = Utils._.zipObject(match[1].split(', '), match[2].split(', '));
+        message = 'Exclusion constraint error';
 
-          Utils._.forOwn(fields, function(value, field) {
-            errors.push(new sequelizeErrors.ValidationErrorItem(
-              field + ' must be unique', 'unique violation', field, value));
-          });
-
-          if (this.callee && this.callee.__options && this.callee.__options.uniqueKeys) {
-            Utils._.forOwn(this.callee.__options.uniqueKeys, function(constraint) {
-              if (Utils._.isEqual(constraint.fields, Object.keys(fields)) && !!constraint.msg) {
-                message = constraint.msg;
-                return false;
-              }
-            });
-          }
-
-          return new sequelizeErrors.ExclusionConstraintError({
-            message: message,
-            errors: errors,
-            parent: err,
-            fields: fields
-          });
-        } else {
-          return new sequelizeErrors.ExclusionConstraintError({
-            message: errMessage,
-            parent: err
-          });
-        }
+        return new sequelizeErrors.ExclusionConstraintError({
+          message: message,
+          constraint: err.constraint,
+          fields: fields,
+          table: err.table,
+          parent: err
+        });
 
-        break;
       default:
         return new sequelizeErrors.DatabaseError(err);
     }

lib/errors.js

@@ -157,10 +157,9 @@ error.ExclusionConstraintError = function (options) {
   this.name = 'SequelizeExclusionConstraintError';
 
   this.message = options.message;
+  this.constraint = options.constraint;
   this.fields = options.fields;
   this.table = options.table;
-  this.value = options.value;
-  this.index = options.index;
 };
 util.inherits(error.ExclusionConstraintError, error.DatabaseError);
 

lib/sequelize.js

@@ -321,6 +321,13 @@ module.exports = (function() {
     sequelizeErrors.UniqueConstraintError;
 
   /**
+   * Thrown when an exclusion constraint is violated in the database
+   * @see {Errors#ExclusionConstraintError}
+   */
+  Sequelize.prototype.ExclusionConstraintError = Sequelize.ExclusionConstraintError =
+    sequelizeErrors.ExclusionConstraintError;
+
+  /**
    * Thrown when a foreign key constraint is violated in the database
    * @see {Errors#ForeignKeyConstraintError}
    */

test/integration/dialects/postgres/error.test.js

+'use strict';
+
+var chai      = require('chai')
+  , sinon     = require('sinon')
+  , expect    = chai.expect
+  , DataTypes = require(__dirname + '/../../../../lib/data-types')
+  , Support   = require(__dirname + '/../../support')
+  , Sequelize = Support.Sequelize
+  , dialect   = Support.getTestDialect()
+  , Promise   = Sequelize.Promise
+  , _ = require('lodash');
+
+chai.config.includeStack = true;
+
+if (dialect.match(/^postgres/)) {
+  var constraintName = 'overlap_period';
+  beforeEach(function () {
+    var self = this;
+    this.Booking = self.sequelize.define('Booking', {
+      roomNo: DataTypes.INTEGER,
+      period: DataTypes.RANGE(DataTypes.DATE)
+    });
+    return self.Booking
+      .sync({ force: true })
+      .then(function () {
+        return self.sequelize.query('ALTER TABLE "' + self.Booking.tableName + '" ADD CONSTRAINT ' + constraintName +
+                                    ' EXCLUDE USING gist ("roomNo" WITH =, period WITH &&)');
+      });
+  });
+
+  describe('[POSTGRES Specific] ExclusionConstraintError', function () {
+
+    it('should contain error specific properties', function () {
+      var errDetails = {
+        message:    'Exclusion constraint error',
+        constraint: 'constraint_name',
+        fields:     { 'field1': 1, 'field2': [123, 321] },
+        table:      'table_name',
+        parent:     new Error('Test error')
+      };
+      var err = new Sequelize.ExclusionConstraintError(errDetails);
+
+      _.each(errDetails, function (value, key) {
+        expect(value).to.be.deep.equal(err[key]);
+      });
+    });
+
+    it('should throw ExclusionConstraintError when "period" value overlaps existing', function () {
+      var Booking = this.Booking;
+
+      return Booking
+        .create({
+          roomNo:    1,
+          guestName: 'Incognito Visitor',
+          period:    [new Date(2015, 0, 1), new Date(2015, 0, 3)]
+        })
+        .then(function () {
+          return Booking
+            .create({
+              roomNo:    1,
+              guestName: 'Frequent Visitor',
+              period:    [new Date(2015, 0, 2), new Date(2015, 0, 5)]
+            })
+            .done(function (err) {
+              expect(!!err).to.be.ok;
+              expect(err instanceof Sequelize.ExclusionConstraintError).to.be.ok;
+            });
+        });
+    });
+
+  });
+}