Don't use a transaction on a mutable/graph which doesn't support transactions.

Author: gkellogg

.github/workflows/ci.yml

@@ -23,6 +23,7 @@ jobs:
           - 2.5
           - 2.6
           - 2.7
+          #- 3.0 # Commented out until net-http-persistent is updaated
           #- ruby-head # Commented out until net-http-persistent is updaated
           - jruby
     steps:

lib/ld/patch/algebra/patch.rb

@@ -23,10 +23,17 @@ class Patch < SPARQL::Algebra::Operator
     def execute(graph, options = {})
       debug(options) {"Delete"}
 
-      graph.transaction(mutable: true) do |tx|
+      if graph.respond_to?(:transaction)
+        graph.transaction(mutable: true) do |tx|
+          operands.inject(RDF::Query::Solutions.new([RDF::Query::Solution.new])) do |bindings, op|
+            # Invoke operand using bindings from prvious operation
+            op.execute(tx, options.merge(bindings: bindings))
+          end
+        end
+      else
         operands.inject(RDF::Query::Solutions.new([RDF::Query::Solution.new])) do |bindings, op|
           # Invoke operand using bindings from prvious operation
-          op.execute(tx, options.merge(bindings: bindings))
+          op.execute(graph, options.merge(bindings: bindings))
         end
       end
     end