Pass through portal properly

This happened to work before because `Query.portalName` was undefined,
but in order to be able to set the portal explicitly it should be using
`Query.portal`.

lib/query.js

@@ -175,7 +175,7 @@ Query.prototype.handlePortalSuspended = function (connection) {
 
 Query.prototype._getRows = function (connection, rows) {
   connection.execute({
-    portal: this.portalName,
+    portal: this.portal,
     rows: rows
   }, true)
   connection.flush()
@@ -201,7 +201,7 @@ Query.prototype.prepare = function (connection) {
 
   // http://developer.postgresql.org/pgdocs/postgres/protocol-flow.html#PROTOCOL-FLOW-EXT-QUERY
   connection.bind({
-    portal: self.portalName,
+    portal: self.portal,
     statement: self.name,
     values: self.values,
     binary: self.binary
@@ -209,7 +209,7 @@ Query.prototype.prepare = function (connection) {
 
   connection.describe({
     type: 'P',
-    name: self.portalName || ''
+    name: self.portal || ''
   }, true)
 
   this._getRows(connection, this.rows)

test/unit/client/prepared-statement-tests.js

@@ -65,7 +65,7 @@ test('bound command', function () {
 
       test('bind argument', function () {
         assert.equal(bindArg.statement, null)
-        assert.equal(bindArg.portal, null)
+        assert.equal(bindArg.portal, '')
         assert.lengthIs(bindArg.values, 1)
         assert.equal(bindArg.values[0], 'hi')
       })
@@ -76,7 +76,7 @@ test('bound command', function () {
       })
 
       test('execute argument', function () {
-        assert.equal(executeArg.portal, null)
+        assert.equal(executeArg.portal, '')
         assert.equal(executeArg.rows, null)
       })
 
@@ -86,3 +86,70 @@ test('bound command', function () {
     })
   })
 })
+
+var portalClient = helper.client()
+var portalCon = portalClient.connection
+var portalParseArg = null
+portalCon.parse = function (arg) {
+  portalParseArg = arg
+  process.nextTick(function () {
+    portalCon.emit('parseComplete')
+  })
+}
+
+var portalBindArg = null
+portalCon.bind = function (arg) {
+  portalBindArg = arg
+  process.nextTick(function () {
+    portalCon.emit('bindComplete')
+  })
+}
+
+var portalExecuteArg = null
+portalCon.execute = function (arg) {
+  portalExecuteArg = arg
+  process.nextTick(function () {
+    portalCon.emit('rowData', { fields: [] })
+    portalCon.emit('commandComplete', { text: '' })
+  })
+}
+
+var portalDescribeArg = null
+portalCon.describe = function (arg) {
+  portalDescribeArg = arg
+  process.nextTick(function () {
+    portalCon.emit('rowDescription', { fields: [] })
+  })
+}
+
+portalCon.flush = function () {
+}
+portalCon.sync = function () {
+  process.nextTick(function () {
+    portalCon.emit('readyForQuery')
+  })
+}
+
+test('prepared statement with explicit portal', function () {
+  assert.ok(portalClient.connection.emit('readyForQuery'))
+
+  var query = portalClient.query(new Query({
+    text: 'select * from X where name = $1',
+    portal: 'myportal',
+    values: ['hi']
+  }))
+
+  assert.emits(query, 'end', function () {
+    test('bind argument', function () {
+      assert.equal(portalBindArg.portal, 'myportal')
+    })
+
+    test('describe argument', function () {
+      assert.equal(portalDescribeArg.name, 'myportal')
+    })
+
+    test('execute argument', function () {
+      assert.equal(portalExecuteArg.portal, 'myportal')
+    })
+  })
+})