schema/field: add Blob to use io.Reader

schema/field/field.go

@@ -183,6 +183,22 @@ func Other(name string, typ driver.Valuer) *otherBuilder {
 	return ob
 }
 
+// Blob returns a new Field with type blob. Blob fields store their data in
+// external blob storage rather than in the database. The mutation accepts an
+// io.Reader for writing, and the model provides methods that return io.ReadCloser
+// and io.WriteCloser for streaming access.
+//
+//	field.Blob("content")
+//
+//	field.Blob("avatar").
+//		Optional()
+func Blob(name string) *blobBuilder {
+	return &blobBuilder{&Descriptor{
+		Name: name,
+		Info: &TypeInfo{Type: TypeBlob},
+	}}
+}
+
 // stringBuilder is the builder for string fields.
 type stringBuilder struct {
 	desc *Descriptor
@@ -660,13 +676,6 @@ func (b *bytesBuilder) Optional() *bytesBuilder {
 	return b
 }
 
-// Blob indicates that this field stores its data in external blob storage
-// rather than in the database. Blob fields have no SQL column.
-func (b *bytesBuilder) Blob() *bytesBuilder {
-	b.desc.Blob = true
-	return b
-}
-
 // Sensitive fields not printable and not serializable.
 func (b *bytesBuilder) Sensitive() *bytesBuilder {
 	b.desc.Sensitive = true
@@ -1424,6 +1433,63 @@ func (b *otherBuilder) Descriptor() *Descriptor {
 	return b.desc
 }
 
+// blobBuilder is the builder for blob fields.
+type blobBuilder struct {
+	desc *Descriptor
+}
+
+// Optional indicates that this field is optional on create.
+// Unlike edges, fields are required by default.
+func (b *blobBuilder) Optional() *blobBuilder {
+	b.desc.Optional = true
+	return b
+}
+
+// Immutable indicates that this field cannot be updated.
+func (b *blobBuilder) Immutable() *blobBuilder {
+	b.desc.Immutable = true
+	return b
+}
+
+// Comment sets the comment of the field.
+func (b *blobBuilder) Comment(c string) *blobBuilder {
+	b.desc.Comment = c
+	return b
+}
+
+// StructTag sets the struct tag of the field.
+func (b *blobBuilder) StructTag(s string) *blobBuilder {
+	b.desc.Tag = s
+	return b
+}
+
+// StorageKey sets the storage key of the field.
+func (b *blobBuilder) StorageKey(key string) *blobBuilder {
+	b.desc.StorageKey = key
+	return b
+}
+
+// Annotations adds a list of annotations to the field object to be used by
+// codegen extensions.
+func (b *blobBuilder) Annotations(annotations ...schema.Annotation) *blobBuilder {
+	b.desc.Annotations = append(b.desc.Annotations, annotations...)
+	return b
+}
+
+// Deprecated marks the field as deprecated.
+func (b *blobBuilder) Deprecated(reason ...string) *blobBuilder {
+	b.desc.Deprecated = true
+	if len(reason) > 0 {
+		b.desc.DeprecatedReason = strings.Join(reason, " ")
+	}
+	return b
+}
+
+// Descriptor implements the ent.Field interface by returning its descriptor.
+func (b *blobBuilder) Descriptor() *Descriptor {
+	return b.desc
+}
+
 // A Descriptor for field configuration.
 type Descriptor struct {
 	Tag              string                  // struct tag.
@@ -1446,7 +1512,6 @@ type Descriptor struct {
 	Comment          string                  // field comment.
 	Deprecated       bool                    // mark the field as deprecated.
 	DeprecatedReason string                  // deprecation reason.
-	Blob             bool                    // field is stored in external blob storage.
 	Err              error
 }
 

schema/field/field_test.go

@@ -943,7 +943,7 @@ func TestTypeString(t *testing.T) {
 	assert.Equal(t, "bool", typ.String())
 	typ = field.TypeInvalid
 	assert.Equal(t, "invalid", typ.String())
-	typ = 21
+	typ = 22
 	assert.Equal(t, "invalid", typ.String())
 }
 
@@ -959,7 +959,7 @@ func TestTypeValid(t *testing.T) {
 	assert.True(t, typ.Valid())
 	typ = 0
 	assert.False(t, typ.Valid())
-	typ = 21
+	typ = 22
 	assert.False(t, typ.Valid())
 }
 
@@ -972,7 +972,7 @@ func TestTypeConstName(t *testing.T) {
 	assert.Equal(t, "TypeInt64", typ.ConstName())
 	typ = field.TypeOther
 	assert.Equal(t, "TypeOther", typ.ConstName())
-	typ = 21
+	typ = 22
 	assert.Equal(t, "invalid", typ.ConstName())
 }
 

schema/field/type.go

@@ -24,6 +24,7 @@ const (
 	TypeEnum
 	TypeString
 	TypeOther
+	TypeBlob
 	TypeInt8
 	TypeInt16
 	TypeInt32
@@ -166,6 +167,7 @@ var (
 		TypeEnum:    "string",
 		TypeString:  "string",
 		TypeOther:   "other",
+		TypeBlob:    "io.Reader",
 		TypeInt:     "int",
 		TypeInt8:    "int8",
 		TypeInt16:   "int16",
@@ -186,6 +188,7 @@ var (
 		TypeEnum:  "TypeEnum",
 		TypeBytes: "TypeBytes",
 		TypeOther: "TypeOther",
+		TypeBlob:  "TypeBlob",
 	}
 )