inspect

lib/ecto/query/inspect.ex

@@ -275,6 +275,12 @@ defimpl Inspect, for: Ecto.Query do
     binding_to_expr(ix, names, part)
   end
 
+  # Format field/2 with string name
+  defp postwalk({{:., _, [{_, _, _} = binding, field]}, meta, []}, _names, _part)
+       when is_binary(field) do
+    {:field, meta, [binding, field]}
+  end
+
   # Remove parens from field calls
   defp postwalk({{:., _, [_, _]} = dot, meta, []}, _names, _part) do
     {dot, [no_parens: true] ++ meta, []}

test/ecto/query/inspect_test.exs

@@ -505,6 +505,11 @@ defmodule Ecto.Query.InspectTest do
     assert i(plan(query)) == "from v0 in values (#{fields})"
   end
 
+  test "field/2 with string name" do
+    query = from p in Post, select: field(p, "visit")
+    assert i(query) == ~s<from p0 in Inspect.Post, select: field(p0, "visit")>
+  end
+
   def plan(query) do
     {query, _, _} = Ecto.Adapter.Queryable.plan_query(:all, Ecto.TestAdapter, query)
     query