[12.0][ENH] sql view - allow group operator

Replaces #345

Adds the possibility, for float and integer columns, to
apply a group operator (average, min, max).

bi_sql_editor_aggregate/models/__init__.py

@@ -0,0 +1,5 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import bi_sql_view
+from . import bi_sql_view_field
+from . import ir_model

bi_sql_editor_aggregate/models/bi_sql_view.py

@@ -0,0 +1,38 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import models, tools
+
+
+class BiSQLView(models.Model):
+    _inherit = 'bi.sql.view'
+
+    def check_manual_fields(self, model):
+        # check the fields we need are defined on self, to stop it going
+        # early on install / startup - particularly problematic during upgrade
+        if 'group_operator' in tools.table_columns(
+                    self.env.cr, 'bi_sql_view_field') and\
+                model._name.startswith(self._model_prefix):
+            # Use SQL instead of ORM, as ORM might not be fully initialised -
+            # we have no control over the order that fields are defined!
+            # We are not concerned about user security rules.
+            self.env.cr.execute(
+                """
+SELECT
+    f.name,
+    f.ttype,
+    f.group_operator
+FROM
+    bi_sql_view v
+    LEFT JOIN bi_sql_view_field f ON f.bi_sql_view_id = v.id
+WHERE
+    v.model_name = %s
+;
+                """, (model._name,)
+                )
+            sql_fields = self.env.cr.fetchall()
+
+            for sql_field in sql_fields:
+                if sql_field[0] in model._fields and\
+                        sql_field[1] in ('integer', 'float') and\
+                        sql_field[2]:
+                    model._fields[sql_field[0]].group_operator = sql_field[2]

bi_sql_editor_aggregate/models/bi_sql_view_field.py

@@ -0,0 +1,25 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import _, api, fields, models
+
+
+class BiSQLViewField(models.Model):
+    _inherit = 'bi.sql.view.field'
+
+    _GROUP_OPERATOR_SELECTION = [
+        ('sum', 'Sum'),
+        ('avg', 'Average'),
+        ('min', 'Minimum'),
+        ('max', 'Maximum'),
+    ]
+
+    _GRAPH_TYPE_SELECTION = [
+        ('col', 'Column'),
+        ('row', 'Row'),
+        ('measure', 'Measure'),
+    ]
+
+    group_operator = fields.Selection(
+        string='Group Operator', selection=_GROUP_OPERATOR_SELECTION,
+        help="By default, Odoo will sum the values when grouping. If you wish"
+        " to alter the behaviour, choose an alternate Group Operator")

bi_sql_editor_aggregate/models/ir_model.py

@@ -0,0 +1,14 @@
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import models
+
+
+class IrModelFields(models.Model):
+    _inherit = 'ir.model.fields'
+
+    def _add_manual_fields(self, model):
+        super()._add_manual_fields(model)
+        if 'bi.sql.view' in self.env:
+            Sql = self.env['bi.sql.view']
+            if hasattr(Sql, 'check_manual_fields'):
+                Sql.check_manual_fields(model)