[IMP] Add dynamic field editor

agreement/models/agreement_section.py

@@ -14,27 +14,54 @@ class AgreementSection(models.Model):
                         help="The title is displayed on the PDF."
                              "The name is not.")
     sequence = fields.Integer(string="Sequence")
-    agreement_id = fields.Many2one(
-        'agreement',
-        string="Agreement",
-        ondelete="cascade"
-    )
-    clauses_ids = fields.One2many(
-        'agreement.clause',
-        'section_id',
-        string="Clauses"
-    )
+    agreement_id = fields.Many2one('agreement', string="Agreement",
+                                   ondelete="cascade")
+    clauses_ids = fields.One2many('agreement.clause', 'section_id',
+                                  string="Clauses")
     content = fields.Html(string="Section Content")
-    dynamic_content = fields.Html(
-        compute="_compute_dynamic_content",
-        string="Dynamic Content",
-        help='compute dynamic Content')
-    active = fields.Boolean(
-        string="Active",
-        default=True,
-        help="If unchecked, it will allow you to hide the agreement without "
-             "removing it."
-    )
+    dynamic_content = fields.Html(compute="_compute_dynamic_content",
+                                  string="Dynamic Content",
+                                  help='compute dynamic Content')
+    active = fields.Boolean(string="Active", default=True,
+                            help="""If unchecked, it will allow you to hide the
+                             agreement without removing it.""")
+
+    # Dynamic field editor
+    field_id = fields.Many2one(
+        'ir.model.fields', string="Field",
+        help="""Select target field from the related document model. If it is a
+         relationship field you will be able to select a target field at the
+         destination of the relationship.""")
+    sub_object_id = fields.Many2one(
+        'ir.model', string="Sub-model",
+        help="""When a relationship field is selected as first field, this
+         field shows the document model the relationship goes to.""")
+    sub_model_object_field_id = fields.Many2one(
+        'ir.model.fields', string="Sub-field",
+        help="""When a relationship field is selected as first field, this
+         field lets you select the target field within the destination document
+          model (sub-model).""")
+    default_value = fields.Char(
+        string="Default Value",
+        help="Optional value to use if the target field is empty.")
+    copyvalue = fields.Char(
+        string="Placeholder Expression",
+        help="""Final placeholder expression, to be copy-pasted in the desired
+         template field.""")
+
+    @api.onchange('field_id')
+    def onchange_sub_object_id(self):
+        if self.field_id:
+            self.sub_object_id = self.env['ir.model'].search(
+                [('model', '=', self.field_id.relation)])[0]
+
+    @api.onchange('sub_model_object_field_id', 'default_value')
+    def onchange_copyvalue(self):
+        if self.sub_model_object_field_id or self.default_value:
+            self.copyvalue = "${object.%s.%s or %s}" % \
+                             (self.field_id.name,
+                              self.sub_model_object_field_id.name,
+                              self.default_value or '\'\'')
 
     # compute the dynamic content for mako expression
     @api.multi