fix: :bug: Fix prompt break

Fix cruly brace break prompt format by adding escape for variable of prompt

edu_assistant/learning_tasks/coding_problem.py

@@ -7,7 +7,7 @@ from pydantic import BaseModel, Field
 from pydantic_redis import Model, Store
 
 from edu_assistant.learning_tasks.base import BaseTask
-from edu_assistant.utils.langchain_utils import load_llm
+from edu_assistant.utils.langchain_utils import escape_for_prompt, load_llm
 from edu_assistant.utils.redis_utils import get_redis_config
 
 TEMPLATE = """The following is a friendly conversation between a human and an ai.
@@ -59,14 +59,14 @@ class CodingProblem(Model):
         store.register_model(CodingProblem)
 
     def expr(self, lang=""):
-        expr = f"## Question\n\n```\n{self.question}\n```\n\n"
+        expr = f"## Question\n\n```\n{escape_for_prompt(self.question)}\n```\n\n"
         expr += (
-            f"## Standard Answer (There might be others)\n\n```{lang}\n{self.standard_answer}\n```\n\n"
+            f"## Standard Answer (There might be others)\n\n```{lang}\n{escape_for_prompt(self.standard_answer)}\n```\n\n"
             if self.standard_answer
             else ""
         )
-        expr += f"## Analysis\n\n```\n{self.analysis}\n```\n\n" if self.analysis else ""
-        expr += "## Extra\n\n" + "".join(self.extra) + "\n"
+        expr += f"## Analysis\n\n```\n{escape_for_prompt(self.analysis)}\n```\n\n" if self.analysis else ""
+        expr += "## Extra\n\n" + escape_for_prompt("".join(self.extra)) + "\n"
         return expr
 
     def __str__(self):
@@ -78,8 +78,8 @@ class CodingAnswer(BaseModel):
     extra: list[str] = Field(default="")
 
     def expr(self, lang=""):
-        expr = f"Answer:\n```{lang}\n{self.answer}\n```\n"
-        expr += "".join(self.extra) + "\n"
+        expr = f"Answer:\n```{lang}\n{escape_for_prompt(self.answer)}\n```\n"
+        expr += escape_for_prompt("".join(self.extra)) + "\n"
         return expr
 
     def __str__(self):

edu_assistant/utils/langchain_utils.py

@@ -71,3 +71,16 @@ def load_vectorstore(collection_name: str = "default") -> VectorStore:
         return doc_store
 
     return None
+
+
+@lru_cache(maxsize=20)
+def escape_for_prompt(text: str) -> str:
+    """escape cruly brackets in text for generate prompt.
+
+    Args:
+        text (str): input string.
+
+    Returns:
+        str: escaped string.
+    """
+    return text.replace("{", "{{").replace("}", "}}")