Add download repositories

app/api/views/download/repositories.py

@@ -0,0 +1,67 @@
+import abc
+from collections import defaultdict
+from typing import Dict, Iterator
+
+from ...models import Project
+from .data import Record
+
+
+class BaseRepository(abc.ABC):
+
+    def __init__(self, project: Project):
+        self.project = project
+
+    @abc.abstractmethod
+    def list(self, export_approved=False) -> Iterator[Record]:
+        pass
+
+
+class TextRepository(BaseRepository):
+
+    def list(self, export_approved=False):
+        docs = self.project.documents.all()
+        if export_approved:
+            docs = docs.exclude(annotations_approved_by=None)
+
+        for doc in docs:
+            label_per_user = self.label_per_user(doc)
+            for user, label in label_per_user.items():
+                yield Record(
+                    id=doc.id,
+                    data=doc.text,
+                    label=label,
+                    user=user,
+                    metadata=doc.meta
+                )
+
+    @abc.abstractmethod
+    def label_per_user(self, doc) -> Dict:
+        raise NotImplementedError()
+
+
+class TextClassificationRepository(TextRepository):
+
+    def label_per_user(self, doc) -> Dict:
+        label_per_user = defaultdict(list)
+        for a in doc.doc_annotations.all():
+            label_per_user[a.user.username].append(a.label.text)
+        return label_per_user
+
+
+class SequenceLabelingRepository(TextRepository):
+
+    def label_per_user(self, doc) -> Dict:
+        label_per_user = defaultdict(list)
+        for a in doc.seq_annotations.all():
+            label = (a.start_offset, a.end_offset, a.label.text)
+            label_per_user[a.user.username].append(label)
+        return label_per_user
+
+
+class Seq2seqRepository(TextRepository):
+
+    def label_per_user(self, doc) -> Dict:
+        label_per_user = defaultdict(list)
+        for a in doc.seq2seq_annotations.all():
+            label_per_user[a.user.username].append(a.text)
+        return label_per_user