allow the parser to determine the right type for the default field

lib/philomena/comments/query.ex

@@ -46,7 +46,7 @@ defmodule Philomena.Comments.Query do
   literal_fields     = ~W(image_id)
   ngram_fields       = ~W(body)
   custom_fields      = ~W(author user_id)
-  default_field      = "body"
+  default_field      = {"body", :ngram}
   transforms         = %{
     "user_id" => &Philomena.Comments.Query.user_id_transform/2,
     "author" => &Philomena.Comments.Query.author_transform/2

lib/philomena/galleries/query.ex

@@ -5,7 +5,7 @@ defmodule Philomena.Galleries.Query do
   literal_fields = ~W(title user image_ids watcher_ids)
   date_fields    = ~W(created_at updated_at)
   ngram_fields   = ~W(description)
-  default_field  = "title"
+  default_field  = {"title", :term}
   aliases        = %{
     "user" => "creator"
   }

lib/philomena/images/query.ex

@@ -65,7 +65,7 @@ defmodule Philomena.Images.Query do
   literal_fields     = ~W(faved_by orig_sha512_hash sha512_hash uploader source_url original_format)
   ngram_fields       = ~W(description)
   custom_fields      = ~W(gallery_id)
-  default_field      = "namespaced_tags.name"
+  default_field      = {"namespaced_tags.name", :term}
   transforms         = %{
     "gallery_id" => &Philomena.Images.Query.gallery_id_transform/2
   }

lib/philomena/posts/query.ex

@@ -46,7 +46,7 @@ defmodule Philomena.Posts.Query do
   literal_fields     = ~W(forum_id topic_id)
   ngram_fields       = ~W(body subject)
   custom_fields      = ~W(author user_id)
-  default_field      = "body"
+  default_field      = {"body", :ngram}
   transforms         = %{
     "user_id" => &Philomena.Posts.Query.user_id_transform/2,
     "author" => &Philomena.Posts.Query.author_transform/2

lib/philomena/reports/query.ex

@@ -7,7 +7,7 @@ defmodule Philomena.Reports.Query do
   ip_fields          = ~W(ip)
   bool_fields        = ~W(open)
   ngram_fields       = ~W(reason)
-  default_field      = "reason"
+  default_field      = {"reason", :ngram}
 
   @parser Parser.parser(
     int_fields: int_fields,

lib/philomena/tags/query.ex

@@ -5,7 +5,7 @@ defmodule Philomena.Tags.Query do
   literal_fields = ~W(slug name name_in_namespace namespace implies alias_of implied_by aliases category analyzed_name)
   bool_fields    = ~W(aliased)
   ngram_fields   = ~W(description short_description)
-  default_field  = "analyzed_name"
+  default_field  = {"analyzed_name", :ngram}
   aliases        = %{
     "implies" => "implied_tags",
     "implied_by" => "implied_by_tags",

lib/search/term_range_parser.ex

@@ -1,18 +1,22 @@
 defmodule Search.TermRangeParser do
   alias Search.LiteralParser
+  alias Search.NgramParser
 
   # Unfortunately, we can't use NimbleParsec here. It requires
   # the compiler, and we're not in a macro environment.
 
-  def parse(input, fields, default_field) do
+  def parse(input, fields, {default_field, type}) do
     tokens =
       Enum.find_value(fields, fn {f, p} ->
         field(input, f, p)
       end)
 
-    tokens || [{LiteralParser, default_field}, range: :eq, value: input]
+    tokens || [{parser(type), default_field}, range: :eq, value: input]
   end
 
+  defp parser(:term), do: LiteralParser
+  defp parser(:ngram), do: NgramParser
+
   defp field(input, field_name, field_parser) do
     field_sz = byte_size(field_name)