split filepointer in to text and binary variants

src/grung/examples.py

@@ -1,15 +1,16 @@
 from grung.types import (
     BackReference,
+    BinaryFilePointer,
     Collection,
     DateTime,
     Dict,
     Field,
-    FilePointer,
     Integer,
     List,
     Password,
     Record,
     RecordDict,
+    TextFilePointer,
     Timestamp,
 )
 
@@ -50,7 +51,8 @@ class Album(Record):
             Dict("credits"),
             List("tracks"),
             BackReference("artist", Artist),
-            FilePointer("cover", extension=".jpg"),
+            BinaryFilePointer("cover", extension=".jpg"),
+            TextFilePointer("review"),
         ]
 
 

src/grung/types.py

@@ -283,14 +283,14 @@ class BackReference(Pointer):
 
 
 @dataclass
-class FilePointer(Field):
+class BinaryFilePointer(Field):
     """
     Write the contents of this field to disk and store the path in the db.
     """
 
     name: str
     value_type: type = bytes
-    extension: str = ".txt"
+    extension: str = ".blob"
 
     def relpath(self, record):
         return Path(record._metadata.table) / record[record._metadata.primary_key] / f"{self.name}{self.extension}"
@@ -298,14 +298,45 @@ class FilePointer(Field):
     def deserialize(self, value: str, db: TinyDB, recurse: bool = True) -> value_type:
         if not value:
             return None
-        return (db.path / value).read_bytes()
+        _, relpath = value.split("::")
+        return self.value_type((db.path / relpath).read_bytes())
+
+    def prepare(self, data: value_type):
+        if not data:
+            return
+        if not isinstance(data, self.value_type):
+            return data.encode()
+        return data
 
     def before_insert(self, value: value_type, db: TinyDB, record: Record) -> None:
+        if not value:
+            return
         relpath = self.relpath(record)
         path = db.path / relpath
         path.parent.mkdir(parents=True, exist_ok=True)
-        path.write_bytes(record[self.name])
+        path.write_bytes(self.prepare(value))
-        record[self.name] = relpath
+        record[self.name] = f"File::{self.relpath(record)}"
+
+
+@dataclass
+class TextFilePointer(BinaryFilePointer):
+    """
+    Write the contents of this field to disk and store the path in the db.
+    """
+
+    name: str
+    value_type: type = str
+    extension: str = ".txt"
+
+    def prepare(self, data: value_type):
+        if data:
+            return str(data).encode()
+
+    def deserialize(self, value: str, db: TinyDB, recurse: bool = True) -> value_type:
+        if not value:
+            return None
+        _, relpath = value.split("::")
+        return (db.path / relpath).read_text()
 
 
 @dataclass

test/test_db.py

@@ -156,12 +156,10 @@ def test_mapping(db):
             name="The Impossible Kid",
             credits={"Produced By": "Aesop Rock", "Lyrics By": "Aesop Rock", "Puke in the MeowMix By": "Kirby"},
             tracks=["Mystery Fish", "Rings", "Lotta Years", "Dorks"],
-            cover=b"some jpg data",
         )
     )
     assert album.credits["Produced By"] == "Aesop Rock"
     assert album.tracks[0] == "Mystery Fish"
-    assert album.cover == b"some jpg data"
 
     aes = db.save(
         examples.Artist(
@@ -176,5 +174,31 @@ def test_mapping(db):
     assert aes.albums[album.name].uid == album.uid
     assert "Kirby" in aes.albums[album.name].credits.values()
 
+
+def test_file_pointers(db):
+    album = db.save(
+        examples.Album(
+            name="The Impossible Kid",
+            credits={"Produced By": "Aesop Rock", "Lyrics By": "Aesop Rock", "Puke in the MeowMix By": "Kirby"},
+            tracks=["Mystery Fish", "Rings", "Lotta Years", "Dorks"],
+            cover=b"some jpg data",
+            review="10/10 no notes",
+        )
+    )
+    assert album.cover == b"some jpg data"
+    assert album.review == "10/10 no notes"
+
+    db.save(
+        examples.Artist(
+            name="Aesop Rock",
+            albums={"The Impossible Kid": album},
+        )
+    )
+
+    album = db.Album.get(doc_id=album.doc_id)
+
     location_on_disk = db.path / album._metadata.fields["cover"].relpath(album)
     assert location_on_disk.read_bytes() == album.cover
+
+    location_on_disk = db.path / album._metadata.fields["review"].relpath(album)
+    assert location_on_disk.read_text() == album.review