Fix introspection: GraphiQL works

Fixes #179.

Author: Totktonada

graphql/convert_schema/arguments.lua

@@ -127,7 +127,7 @@ function arguments.convert_record_fields(fields, root_name)
 
     local context = {
         field_name = nil,
-        path = {'$arguments', root_name},
+        path = {'arguments', root_name},
     }
 
     local args = {}

graphql/convert_schema/helpers.lua

@@ -3,7 +3,7 @@ local check = utils.check
 
 local helpers = {}
 
---- Get dot-separated name prepended with namespace.
+--- Get three-underscore-separated name prepended with namespace.
 ---
 --- @tparam string name base name
 ---
@@ -19,18 +19,18 @@ function helpers.full_name(name, context)
         return name
     end
 
-    local namespace = table.concat(context.path, '.')
-    return namespace .. '.' .. name
+    local namespace = table.concat(context.path, '___')
+    return namespace .. '___' .. name
 end
 
---- Get last part of dot-separated name.
+--- Get last part of three-underscore-separated name.
 ---
 --- @tparam string name full name
 ---
 --- @treturn string base name
 function helpers.base_name(name)
     check(name, 'name', 'string')
-    return name:gsub('^.*%.', '')
+    return name:gsub('^.*___', '')
 end
 
 return helpers

graphql/core/types.lua

@@ -225,7 +225,8 @@ end
 
 function types.inputMap(config)
   local instance = {
-    __type = 'InputMap',
+    __type = 'Scalar',
+    subtype = 'InputMap',
     name = config.name,
     serialize = function(value) return value end,
     parseValue = function(value) return value end,
@@ -243,7 +244,8 @@ end
 
 function types.inputUnion(config)
   local instance = {
-    __type = 'InputUnion',
+    __type = 'Scalar',
+    subtype = 'InputUnion',
     name = config.name,
     serialize = function(value) return value end,
     parseValue = function(value) return value end,

graphql/core/util.lua

@@ -71,7 +71,12 @@ function util.coerceValue(node, schemaType, variables)
   end
 
   local isInputObject = schemaType.__type == 'InputObject'
-  if isInputObject or schemaType.__type == 'InputMap' then
+  local isInputMap = schemaType.__type == 'Scalar' and
+    schemaType.subtype == 'InputMap'
+  local isInputUnion = schemaType.__type == 'Scalar' and
+    schemaType.subtype == 'InputUnion'
+
+  if isInputObject or isInputMap then
     if node.kind ~= 'inputObject' then
       error('Expected an input object')
     end
@@ -102,18 +107,18 @@ function util.coerceValue(node, schemaType, variables)
     return node.value
   end
 
+  if isInputUnion then
+    local child_type = schemaType.resolveNodeType(node)
+    return util.coerceValue(node, child_type, variables)
+  end
+
   if schemaType.__type == 'Scalar' then
     if schemaType.parseLiteral(node) == nil then
       error('Could not coerce "' .. tostring(node.value) .. '" to "' .. schemaType.name .. '"')
     end
 
     return schemaType.parseLiteral(node)
   end
-
-  if schemaType.__type == 'InputUnion' then
-    local child_type = schemaType.resolveNodeType(node)
-    return util.coerceValue(node, child_type, variables)
-  end
 end
 
 return util