provide sqlite serializer for arrays (closes #3036179)

site_cubicweb.py

+import json
+
+from logilab.database import get_db_helper, FunctionDescr
+from logilab.database.sqlgen import SQLExpression
 
 from yams import register_base_type
 
-register_base_type('IntArray', ('size',))
-register_base_type('FloatArray')
+from rql.utils import register_function
 
 
-from logilab.database import get_db_helper, FunctionDescr
-from logilab.database.sqlgen import SQLExpression
+register_base_type('IntArray', ('size',))
+register_base_type('FloatArray')
 
 pghelper = get_db_helper('postgres')
+sqlitehelper = get_db_helper('sqlite')
 
 def convert_array(values):
     """converter for Geometry"""
@@ -17,10 +21,17 @@ def convert_array(values):
 # Yams -> SQL type mapping
 pghelper.TYPE_MAPPING['IntArray'] = 'integer[]'
 pghelper.TYPE_MAPPING['FloatArray'] = 'double precision[]'
+sqlitehelper.TYPE_MAPPING['IntArray'] = 'text'
+sqlitehelper.TYPE_MAPPING['FloatArray'] = 'text'
+
 
 # Python -> SQL conversion
 pghelper.TYPE_CONVERTERS['IntArray'] = convert_array
 pghelper.TYPE_CONVERTERS['FloatArray'] = convert_array
+# NOTE: there's not way yet to specify the symmetrical operation
+#       (i.e. deserialization)
+sqlitehelper.TYPE_CONVERTERS['IntArray'] = json.dumps
+sqlitehelper.TYPE_CONVERTERS['FloatArray'] = json.dumps
 
 
 ## from cubicweb.schema import CONSTRAINTS