Add helper functions for ProgrammingLanguage

helpers/programminglanguage_helpers.py

@@ -0,0 +1,94 @@
+from typing import List, Optional, Dict, Union
+from sqlalchemy.orm import Session
+import random
+from pydantic import BaseModel, validator
+from models.programming_language import ProgrammingLanguage
+
+def validate_language_name(name: str) -> bool:
+    """
+    Validate programming language name format.
+    
+    Args:
+        name: Programming language name to validate
+        
+    Returns:
+        bool: True if name format is valid, False otherwise
+    """
+    # Language name should be at least 1 character and contain only letters, numbers, and common symbols
+    return bool(name and len(name.strip()) > 0 and all(c.isalnum() or c in '+-#.' for c in name))
+
+def get_random_language(db: Session) -> Optional[ProgrammingLanguage]:
+    """
+    Get a random programming language from the database.
+    
+    Args:
+        db: Database session
+        
+    Returns:
+        Random ProgrammingLanguage object if any exist, None otherwise
+    """
+    languages = db.query(ProgrammingLanguage).all()
+    return random.choice(languages) if languages else None
+
+def get_language_by_name(db: Session, name: str) -> Optional[ProgrammingLanguage]:
+    """
+    Get a programming language by its name.
+    
+    Args:
+        db: Database session
+        name: Language name to search for
+        
+    Returns:
+        ProgrammingLanguage object if found, None otherwise
+    """
+    return db.query(ProgrammingLanguage).filter(ProgrammingLanguage.name == name).first()
+
+def create_language_safely(
+    db: Session, 
+    name: str, 
+    description: Optional[str] = None
+) -> Union[ProgrammingLanguage, Dict[str, str]]:
+    """
+    Create a new programming language with validation and error handling.
+    
+    Args:
+        db: Database session
+        name: Language name
+        description: Optional language description
+        
+    Returns:
+        ProgrammingLanguage object if created successfully, error dict otherwise
+    """
+    if not validate_language_name(name):
+        return {"error": "Invalid language name format"}
+    
+    existing_language = get_language_by_name(db, name)
+    if existing_language:
+        return {"error": "Language already exists"}
+        
+    db_language = ProgrammingLanguage(
+        name=name,
+        description=description
+    )
+    
+    db.add(db_language)
+    db.commit()
+    db.refresh(db_language)
+    
+    return db_language
+
+def filter_languages_by_pattern(db: Session, pattern: str) -> List[ProgrammingLanguage]:
+    """
+    Filter programming languages by name pattern.
+    
+    Args:
+        db: Database session
+        pattern: Search pattern to filter languages
+        
+    Returns:
+        List of ProgrammingLanguage objects matching the pattern
+    """
+    search = f"%{pattern}%"
+    return db.query(ProgrammingLanguage).filter(
+        ProgrammingLanguage.name.ilike(search)
+    ).all()