Update app.py

app.py

@@ -440,7 +440,8 @@ class Application:
         st.markdown(
             """
             This application finds the best matching historical players using vector search with [txtai](https://github.com/neuml/txtai).
-            Raw data is from the [Baseball Databank](https://github.com/chadwickbureau/baseballdatabank) GitHub project. 
+            Raw data is from the [Baseball Databank](https://github.com/chadwickbureau/baseballdatabank) GitHub project. Read [this
+            article](https://medium.com/neuml/explore-baseball-history-with-vector-search-5778d98d6846) for more details.
         """
         )
 
@@ -457,7 +458,7 @@ class Application:
         params = self.params()
 
         # Category and stats
-        category = self.category(params.get("category"))
+        category = self.category(params.get("category"), "category")
         stats = self.batting if category == "Batting" else self.pitching
 
         # Player name
@@ -505,12 +506,13 @@ class Application:
 
         return params
 
-    def category(self, category):
+    def category(self, category, key):
         """
         Builds category input widget.
 
         Args:
             category: category parameter
+            key: widget key
 
         Returns:
             category component
@@ -523,7 +525,7 @@ class Application:
         default = categories.index(category) if category and category in categories else 0
 
         # Radio box component
-        return st.radio("Stat", categories, index=default, horizontal=True, key="category")
+        return st.radio("Stat", categories, index=default, horizontal=True, key=key)
 
     def name(self, names, name):
         """