Set fields property of schema resource.

Author: tswast

bigquery/google/cloud/bigquery/table.py

@@ -928,7 +928,9 @@ def upload_from_file(self,
 
         if len(self._schema) > 0:
             load_config = metadata['configuration']['load']
-            load_config['schema'] = _build_schema_resource(self._schema)
+            load_config['schema'] = {
+                'fields': _build_schema_resource(self._schema)
+            }
 
         _configure_job_metadata(metadata, allow_jagged_rows,
                                 allow_quoted_newlines, create_disposition,

bigquery/tests/data/colors.avroschema

@@ -0,0 +1,10 @@
+{
+  "namespace": "com.example.bigquery",
+  "type": "record",
+  "name": "Color",
+  "fields": [
+    {"name": "name", "type": "string"},
+    {"name": "wavelength_nm", "type": "long"}
+  ],
+  "doc": "Scema of a colors table"
+}

bigquery/tests/data/colors.json

@@ -0,0 +1,7 @@
+{"name": "violet", "wavelength_nm": 400}
+{"name": "indigo", "wavelength_nm": 445}
+{"name": "blue", "wavelength_nm":   475}
+{"name": "green", "wavelength_nm":  510}
+{"name": "yellow", "wavelength_nm": 570}
+{"name": "orange", "wavelength_nm": 590}
+{"name": "red", "wavelength_nm":    650}