v0.2 Preview: Construction Plan.

backend/latex_lab/models.py

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+import uuid
+
+from django.conf import settings
+from django.db import models
+
+
+class FormulaDocument(models.Model):
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="formulas")
+    title = models.CharField(max_length=120)
+    source = models.TextField(blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        ordering = ["-updated_at"]
+
+
+class FormulaRevision(models.Model):
+    document = models.ForeignKey(FormulaDocument, on_delete=models.CASCADE, related_name="revisions")
+    source = models.TextField()
+    created_at = models.DateTimeField(auto_now_add=True)
+
+
+class LatexCourse(models.Model):
+    slug = models.SlugField(unique=True)
+    title = models.CharField(max_length=120)
+    description = models.TextField(blank=True)
+    order = models.PositiveIntegerField(default=0)
+    is_published = models.BooleanField(default=False)
+
+    def __str__(self):
+        return self.title
+
+
+class LatexLesson(models.Model):
+    course = models.ForeignKey(LatexCourse, on_delete=models.CASCADE, related_name="lessons")
+    slug = models.SlugField()
+    title = models.CharField(max_length=120)
+    content = models.TextField()
+    example_source = models.TextField(blank=True)
+    order = models.PositiveIntegerField(default=0)
+
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(fields=("course", "slug"), name="unique_course_lesson")
+        ]
+        ordering = ["order"]
+
+
+class LatexExercise(models.Model):
+    lesson = models.ForeignKey(LatexLesson, on_delete=models.CASCADE, related_name="exercises")
+    prompt = models.TextField()
+    expected_source = models.TextField()
+    explanation = models.TextField(blank=True)
+    order = models.PositiveIntegerField(default=0)
+
+
+class LatexAttempt(models.Model):
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="latex_attempts")
+    exercise = models.ForeignKey(LatexExercise, on_delete=models.PROTECT)
+    submitted_source = models.TextField()
+    is_correct = models.BooleanField()
+    created_at = models.DateTimeField(auto_now_add=True)
+
+
+class HandwritingRecognitionJob(models.Model):
+    class Status(models.TextChoices):
+        PENDING = "pending", "等待"
+        COMPLETE = "complete", "完成"
+        FAILED = "failed", "失败"
+
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
+    status = models.CharField(max_length=16, choices=Status.choices, default=Status.PENDING)
+    result = models.JSONField(default=dict, blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)