GROUPBY和排序依據在web2py中

Question

我有三個表：

 
db.define_table('projects',Field('name')) 
db.define_table('tests', 
       Field('name'), 
       Field('project',db.projects, notnull=True)) 
db.define_table('results', 
       Field('test',db.tests, notnull=True), 
       Field('status'), 
       Field('started', 'datetime', writable=False)) 

我想有個項目，通過和失敗的測試數量的列表。如果最新結果的狀態爲「通過」，則測試通過/失敗。如果沒有測試結果，則狀態應爲無。

Answer 1

你可以嘗試一些程序

for project_row in db(db.projects).select(): 
    numPassed = 0 
    numFailed = 0 
    numNull =0 
    num = 0 
    for test_row in db(db.tests.project==project_row).select(): 
     results=db(db.results.test==test_row).select(orderby=~db.results.started, 
                 limitby=0) 
     if len(results) == 0: 
      numNull += 1 
     elif results[0].status=="pass": 
      numPassed +=1 
     else: 
      numFailed +=1 
    print project_row.name, numPassed, numFailed, numNull