29 lines
		
	
	
		
			1017 B
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
			
		
		
	
	
			29 lines
		
	
	
		
			1017 B
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
# HG changeset patch
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# Parent 8d5573b704b2867788dd6895503f1871c2976a29
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# Parent  9eb163e5da677a0d09e01a354ba56697b576a4bc
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diff --git a/openacademy/models.py b/openacademy/models.py
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--- a/openacademy/models.py
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+++ b/openacademy/models.py
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@@ -39,3 +39,20 @@ class Session(models.Model):
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                 r.taken_seats = 0.0
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             else:
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                 r.taken_seats = 100.0 * len(r.attendee_ids) / r.seats
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+
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+    @api.onchange('seats', 'attendee_ids')
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+    def _verify_valid_seats(self):
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+        if self.seats < 0:
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+            return {
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+                'warning': {
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+                    'title': "Incorrect 'seats' value",
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+                    'message': "The number of available seats may not be negative",
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+                },
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+            }
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+        if self.seats < len(self.attendee_ids):
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+            return {
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+                'warning': {
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+                    'title': "Too many attendees",
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+                    'message': "Increase seats or remove excess attendees",
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+                },
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+            }
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