Basic example cleanup

Rename sales-api to web-api and remove sales-admin

example-project/internal/project/models.go

@@ -0,0 +1,43 @@
+package project
+
+import (
+	"time"
+
+	"gopkg.in/mgo.v2/bson"
+)
+
+// Project is an item we sell.
+type Project struct {
+	ID           bson.ObjectId `bson:"_id" json:"id"`                      // Unique identifier.
+	Name         string        `bson:"name" json:"name"`                   // Display name of the project.
+	Cost         int           `bson:"cost" json:"cost"`                   // Price for one item in cents.
+	Quantity     int           `bson:"quantity" json:"quantity"`           // Original number of items available.
+	DateCreated  time.Time     `bson:"date_created" json:"date_created"`   // When the project was added.
+	DateModified time.Time     `bson:"date_modified" json:"date_modified"` // When the project record was lost modified.
+}
+
+// NewProject is what we require from clients when adding a Project.
+type NewProject struct {
+	Name     string `json:"name" validate:"required"`
+	Cost     int    `json:"cost" validate:"required,gte=0"`
+	Quantity int    `json:"quantity" validate:"required,gte=1"`
+}
+
+// UpdateProject defines what information may be provided to modify an
+// existing Project. All fields are optional so clients can send just the
+// fields they want changed. It uses pointer fields so we can differentiate
+// between a field that was not provided and a field that was provided as
+// explicitly blank. Normally we do not want to use pointers to basic types but
+// we make exceptions around marshalling/unmarshalling.
+type UpdateProject struct {
+	Name     *string `json:"name"`
+	Cost     *int    `json:"cost" validate:"omitempty,gte=0"`
+	Quantity *int    `json:"quantity" validate:"omitempty,gte=1"`
+}
+
+// Sale represents a transaction where we sold some quantity of a
+// Project.
+type Sale struct{}
+
+// NewSale defines what we require when creating a Sale record.
+type NewSale struct{}