Completed the csv read functions

budgeting/backend/app.py

@@ -107,20 +107,45 @@ def find_user_by_id(user_id):
     return None
 
 def get_budgets_for_user(user_id):
-    # TODO: read budgets.csv and return all rows where user_id matches
-    pass
+    # DONE? read budgets.csv and return all rows where user_id matches
+    rows = []
+    for row in _read_csv("budgets.csv"):
+        if row["user_id"] == str(user_id):
+            rows.append(row)
+    if (rows.count == 0):
+        return None
+    else:
+        return rows
 
 def get_budget_by_id(budget_id):
-    # TODO: read budgets.csv and return the row where id matches, or None
-    pass
+    # DONE? read budgets.csv and return the row where id matches, or None
+    for row in _read_csv("budgets.csv"):
+            if row["id"] == str(budget_id):
+                return row
+    return None
 
 def get_categories_for_budget(budget_id):
-    # TODO: read categories.csv and return all rows where budget_id matches
-    pass
-
+    # DONE? read categories.csv and return all rows where budget_id matches
+    rows = []
+    for row in _read_csv("categories.csv"):
+        if row["budget_id"] == str(budget_id):
+            rows.append(row)
+    if (rows.count == 0):
+            return None
+    else:
+        return rows
+
 def get_latest_budget(user_id):
     # TODO: get all budgets for this user and return the most recently created, or None
-    pass
+    latest_budget = []
+    for row in _read_csv("budgets.csv"):
+        if (row["user_id"] == str(user_id)):
+            if (latest_budget == [] or latest_budget["date_created"] < row["date_created"]):
+                latest_budget = row
+    if (latest_budget == []):
+        return None
+    else:
+        return latest_budget
 
 def save_budget(user_id, monthly_income, carryover, categories):
     # TODO: append a new row to budgets.csv and save categories, return the new id