server: improve parent merging

server.rb

@@ -63,17 +63,15 @@ get '/' do
 end
 
 def get_part_by_id(id)
+  return nil unless id
   statement = @db.prepare("SELECT part.id, part.name, part.description, part.datasheet, manufacturer.name AS manufacturer, package.name AS package, part.pincount AS pincount, part.page AS page, part.family AS parent FROM part LEFT JOIN package ON package.id = part.package LEFT JOIN manufacturer ON manufacturer.id = part.manufacturer WHERE part.id = ?")
   part = statement.execute(id).to_a[0]
   return nil unless part
-  # merge with family info
-  while part and part["parent"] do
-    family = statement.execute(part["parent"]).to_a[0]
-    part["parent"] = nil # reset info
-    break unless family
-    part["family"] ||= family["name"]
-    family.each do |k,v|
-      part[k] ||= v
+  parent = get_part_by_id(part["parent"])
+  # merge parent info
+  if parent then
+    part.each do |k,v|
+      part[k] ||= parent[k]
     end
   end
   # add all distributors
@@ -101,18 +99,14 @@ def get_part_by_id(id)
   end
   # add properties
   part["properties"] = {}
-  family = id
   statement = @db.prepare("SELECT property.name AS name, property_value.value AS value FROM property_value JOIN property ON property.id = property_value.property WHERE property_value.part = ?")
-  family_stmt = @db.prepare("SELECT family FROM part WHERE id = ?")
-  while family do
-    statement.execute(family).each do |row|
-      part["properties"][row["name"]] ||= []
-      part["properties"][row["name"]] << row["value"]
-    end
-    results = family_stmt.execute(family)
-    family = nil
-    results.each do |row|
-      family = row["id"]
+  statement.execute(id).each do |row|
+    part["properties"][row["name"]] ||= []
+    part["properties"][row["name"]] << row["value"]
+  end
+  if parent then
+    parent["properties"].each do |k,v|
+      part["properties"][k] ||= v
     end
   end
   # clean up