bugfix: pop last scope when indenting

Author: Jell

lib/activerecord-pg-format-db-structure/indenter.rb

@@ -233,7 +233,7 @@ def to_s
       end
 
       def current_scope_type
-        @scopes.last.type
+        @scopes.last&.type
       end
 
       def current_token=(token)
@@ -251,7 +251,7 @@ def current_padding
       end
 
       def pop_scope
-        @scopes.pop.type
+        @scopes.pop&.type
       end
 
       def newline
@@ -263,8 +263,10 @@ def append_whitespace
       end
 
       def apply_indent
-        @string << (INDENT_STRING * @scopes.sum(&:indent))
-        @string << @scopes.last.padding
+        if @scopes.any?
+          @string << (INDENT_STRING * @scopes.sum(&:indent))
+          @string << @scopes.last.padding
+        end
       end
 
       def append_token(rjust: 0)

spec/activerecord-pg-format-db-structure/formatter_spec.rb

@@ -263,5 +263,20 @@
         );
       SQL
     end
+
+    it "handles filter where clauses" do
+      formatter = described_class.new
+
+      source = +<<~SQL
+        select range_agg(my_range) filter (where true) from my_table
+      SQL
+
+      expect(formatter.format(source)).to eq(<<~SQL)
+       SELECT range_agg(my_range) FILTER (
+              WHERE true
+       )
+       FROM my_table;
+      SQL
+    end
   end
 end