Add SetClient() on Card, Board, and List.

board.go

@@ -80,6 +80,15 @@ type BackgroundImage struct {
 	URL    string `json:"url"`
 }
 
+// SetClient can be used to override this Board's internal connection to the
+// Trello API. Normally, this is set automatically after calls to GetBoard()
+// from the Client. This method exists for special cases where
+// functions which need a Client need to be called on Board structs which
+// weren't created from a Client in the first place.
+func (b *Board) SetClient(newClient *Client) {
+	b.client = newClient
+}
+
 // CreatedAt returns a board's created-at attribute as time.Time.
 func (b *Board) CreatedAt() time.Time {
 	t, _ := IDToTime(b.ID)

board_test.go

@@ -294,3 +294,12 @@ func TestBoardAddMember(t *testing.T) {
 		t.Errorf("Status membership incorrect, got %v", response.Memberships[1].Unconfirmed)
 	}
 }
+
+func TestBoardSetClient(t *testing.T) {
+	board := testBoard(t)
+	client := testClient()
+	board.SetClient(client)
+	if board.client == nil {
+		t.Error("Expected non-nil board.client")
+	}
+}

card.go

@@ -85,6 +85,15 @@ type Card struct {
 	customFieldMap *map[string]interface{}
 }
 
+// SetClient can be used to override this Card's internal connection to the
+// Trello API. Normally, this is set automatically after calls to GetCard()
+// from the Client or a List. This method exists for special cases where
+// functions which need a Client need to be called on Card structs which
+// weren't created from a Client in the first place.
+func (c *Card) SetClient(newClient *Client) {
+	c.client = newClient
+}
+
 // CreatedAt returns the receiver card's created-at attribute as time.Time.
 func (c *Card) CreatedAt() time.Time {
 	t, _ := IDToTime(c.ID)

card_test.go

@@ -300,6 +300,15 @@ func TestAddURLAttachmentToCard(t *testing.T) {
 	}
 }
 
+func TestCardSetClient(t *testing.T) {
+	card := Card{}
+	client := testClient()
+	card.SetClient(client)
+	if card.client == nil {
+		t.Error("Expected non-nil card.client")
+	}
+}
+
 // Utility function to get a simple response from Client.GetCard()
 //
 func testCard(t *testing.T) *Card {

list.go

@@ -24,6 +24,15 @@ type List struct {
 	Cards      []*Card `json:"cards,omitempty"`
 }
 
+// SetClient can be used to override this List's internal connection to the
+// Trello API. Normally, this is set automatically after calls to GetList()
+// from the Client. This method exists for special cases where
+// functions which need a Client need to be called on List structs which
+// weren't created from a Client in the first place.
+func (l *List) SetClient(newClient *Client) {
+	l.client = newClient
+}
+
 // CreatedAt returns the time.Time from the list's id.
 func (l *List) CreatedAt() time.Time {
 	t, _ := IDToTime(l.ID)

list_test.go

@@ -173,3 +173,12 @@ func TestUpdateList(t *testing.T) {
 		t.Errorf("Expected the returned list to pick up a position. Instead got '%v'.", list.Pos)
 	}
 }
+
+func TestListSetClient(t *testing.T) {
+	list := List{}
+	client := testClient()
+	list.SetClient(client)
+	if list.client == nil {
+		t.Error("Expected non-nil list.client")
+	}
+}