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Related party transactions (Tables)
 12 Months Ended
Dec. 31, 2019
Related party transactions  
Schedule of material related party transactions
                         
 
Year ended December 31,
 
 
2017
 
  
2018
 
  
2019
 
 
RMB
   
RMB
   
RMB
 
Purchase of goods
   
213,350
      
340,356
      
1,451,404
  
Purchase of services
   
1,001
      
317,921
      
462,126
  
Provision
of services
   
1,825
      
6,300
      
44,420
  
Sales
of
product
    
—
     
—
     
111,510