【发布时间】：2021-10-30 17:19:53
【问题描述】：
我正在尝试开发一个程序来确定哪些植物对其他植物有益和有害。我希望它能够遍历植物列表并比较并查看一种植物的 deters_insects_and_animals 物种是否与另一种植物的 pests 匹配，然后将其添加到 ally_deter_pests_for(self): 的列表中
我不确定该怎么做。
class AnimalSpecies(models.Model):
common_name = CharField(max_length = 200, null = True, blank = True)
scientific_name = CharField(max_length = 200, null = True, blank = True)
genus = Foreign
Key(Genus, null = True, blank = True, on_delete = models.CASCADE)
class Meta:
verbose_name = "Animal Species"
verbose_name_plural = "Animal Species"
def __str__(self):
return self.common_name
#___________________________________________________________________________________Begin Species_______________________________________________
class PlantSpecies(models.Model):
#________________________Name & Relationships________________________
common_name = CharField(max_length = 200, null = True, blank = True)
species_name = CharField(max_length = 200, null = True, blank = True)
genus = ForeignKey(Genus, blank = True, null =True, on_delete = models.CASCADE)
rotation_family = ForeignKey(RotationFamily, blank = True, null = True, on_delete = models.CASCADE)
#________________________Growth & Environment________________________
annual = BooleanField(null = True, blank = True)
GROWTH_HABIT_LIST = [
("H", "Herb"),
("S", "Shrub"),
("T", "Tree"),
("U", "Succulent"),
("G", "Grass"),
("F", "Fern"),
("V", "Vine")
]
growth_habit = CharField(max_length = 20, blank = True, null = True, choices = GROWTH_HABIT_LIST)
pruning = TextField(max_length = 1000, null = True, blank = True)
days_to_germinate = IntegerField(null = True, blank = True, default = 0)
days_to_maturity = IntegerField(null = True, blank = True, default = 0)
zone = IntegerField(null = True, blank = True, default = 0)
SUN_REQUIREMENT_LIST = [
("FH", "Full Shade"),
("FHPH", "Full Shade-Partial Shade"),
("PHFS", "Partial Shade-Full Sun"),
("FS", "Full Sun")
]
sun_requirement = CharField(max_length = 200, null = True, blank = True, choices = SUN_REQUIREMENT_LIST)
WATER_REQUIREMENT_LIST = [
("M", "Mesic"),
]
water_requirement = CharField(max_length = 20, null = True, blank = True, choices = WATER_REQUIREMENT_LIST)
pollinator = ManyToManyField(AnimalSpecies, blank = True, related_name = "pollinators")
beneficials = ManyToManyField(AnimalSpecies, blank = True, related_name = "beneficials")
pests = ManyToManyField(AnimalSpecies, blank = True, related_name = "Pests")
deters_insect_and_animals = ManyToManyField(AnimalSpecies, blank = True, related_name = "deters_AnimalSpecies")
#________________________Spacing________________________
number_per_square_foot = IntegerField(null = True, blank = True, default = 0)
spacing_inches = FloatField(max_length = 200, null = True, blank = True, default = 0)
spread_inches = FloatField(max_length = 200, null = True, blank = True, default = 0)
height = IntegerField(null = True, blank = True, default = 0)
#________________________Yield________________________
expected_yield_pounds = FloatField(max_length = 200, blank = True, null = True, default = 0)
expected_pound_per_fruit = FloatField(max_length = 200, blank = True, null = True, default = 0)
#________________________Description________________________
COLOR_CHOICES = [
("RE", "Red"),
("OR", "Orange"),
("YE", "Yellow"),
("LGR", "Light Green"),
("GR", "Green"),
("DGR", "Dark Green"),
("BL", "Blue"),
("PU", "Purple"),
("PI", "Pink"),
("WH", "White")
]
foliage_color = CharField(max_length = 20, null = True, blank = True, choices = COLOR_CHOICES)
flower_color = CharField(max_length = 20, null = True, blank = True, choices = COLOR_CHOICES)
fruit_color = CharField(max_length = 20, null = True, blank = True, choices = COLOR_CHOICES)
PARTS_CHOICES = [
("FLRW", "Fruit, Leaves, Roots, Flowers"),
("FLW", "Fruit, Leaves, Flowers"),
("FR", "Fruit, Roots, Flowers"),
("LR", "Leaves, Roots, Flowers"),
("LRW", "Leaves, Roots, Flowers"),
("FL", "Fruit, Leaves"),
("FR", "Fruit, Roots"),
("LR", "Leaves, Roots"),
("F", "Fruit"),
("L", "Leaves"),
("R", "Roots"),
("W", "Flowers"),
("O", "Other"),
("N", "None")
]
edible_parts = CharField(max_length = 20, null = True, blank = True, choices = PARTS_CHOICES)
toxic_parts = CharField(max_length = 20, null = True, blank = True, choices = PARTS_CHOICES)
@property
def improves_growth_and_flavor(self):
return ManyToManyField(self, blank = True, related_name = "improves_growth")
@property
def improves_health_and_flavor(self):
return ManyToManyField(self, blank = True, related_name = "improves_health")
@property
def impairs_health_and_growth(self):
return ManyToManyField(self, blank = True, related_name = "impairs_health")
@property
def visual_name(self):
return f"{self.rotation_family.visual_color}{self.common_name}"
visual_name.fget.short_description = "Name"
@property
def scientific_name(self):
return f"{self.genus.scientific_name} {self.species_name}"
@property
def expected_fruit_yield(self):
try:
return self.expected_yield_pounds / self.expected_pound_per_fruit
except:
return "0"
@property
def ally_deter_pest_for(self):
x = []
y = PlantSpecies.objects.filter(self.pests)
for i in range(len(self.deters_insect_and_animals)):
for h in range(len(y)):
if self.deters_insect_and_animals[i] == y[h]:
x.append(f"{y[h].common_name} | {self.deters_insect_and_animals[i]}")
else:
pass
return x
例如，它会发现万寿菊可以阻止跳蚤甲虫，而西兰花会受到跳蚤甲虫的影响。因此，金盏花ally_deter_pest_for(self):would x.append(broccoli)
现在我收到一个错误
内部服务器错误：/admin/GardenApp/plantspecies/ 回溯（最近一次通话最后）： 文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\options.py”，第 575 行，在 get_field 返回 self.fields_map[field_name] KeyError: 'ally_deter_pest_for'
在处理上述异常的过程中，又发生了一个异常：
Traceback（最近一次调用最后一次）： 文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\admin\utils.py”，第 265 行，在 lookup_field f = _get_non_gfk_field（选择，名称） _get_non_gfk_field 中的文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\admin\utils.py”，第 296 行 字段 = opts.get_field（名称） 文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\options.py”，第 577 行，在 get_field raise FieldDoesNotExist("%s 没有名为 '%s' 的字段" % (self.object_name, field_name)) django.core.exceptions.FieldDoesNotExist：PlantSpecies 没有名为“ally_deter_pest_for”的字段
在处理上述异常的过程中，又发生了一个异常：
Traceback（最近一次调用最后一次）：文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\handlers\exception.py", 第 47 行，在内部 response = get_response(request) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\handlers\base.py", 第 202 行，在 _get_response 中 response = response.render() 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\response.py", 第 105 行，在渲染中 self.content = self.rendered_content 文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\response.py”， 第 83 行，在 render_content 中 return template.render(context, self._request) File "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\backends\django.py", 第 61 行，在渲染中 返回 self.template.render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 170 行，在渲染中 返回 self._render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 162 行，在 _render 中 返回 self.nodelist.render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 938 行，在渲染中 bit = node.render_annotated(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 905 行，在 render_annotated 中 返回 self.render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\loader_tags.py", 第 150 行，在渲染中 返回已编译的_parent._render（上下文）文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py”， 第 162 行，在 _render 中 返回 self.nodelist.render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 938 行，在渲染中 bit = node.render_annotated(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 905 行，在 render_annotated 中 返回 self.render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\loader_tags.py", 第 150 行，在渲染中 返回已编译的_parent._render（上下文）文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py”， 第 162 行，在 _render 中 返回 self.nodelist.render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 938 行，在渲染中 bit = node.render_annotated(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 905 行，在 render_annotated 中 返回 self.render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\loader_tags.py", 第 62 行，在渲染中 结果 = block.nodelist.render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 938 行，在渲染中 bit = node.render_annotated(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 905 行，在 render_annotated 中 返回 self.render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\loader_tags.py", 第 62 行，在渲染中 结果 = block.nodelist.render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 938 行，在渲染中 bit = node.render_annotated(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py", 第 905 行，在 render_annotated 中 返回 self.render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\admin\templatetags\base.py", 第 33 行，在渲染中 返回 super().render(context) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\library.py", 第 214 行，在渲染中 _dict = self.func(*resolved_args, **resolved_kwargs) 文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\admin\templatetags\admin_list.py” , 第 341 行，在 result_list 中 “结果”：列表（结果（cl）），文件“C：\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\admin\templatetags\admin_list.py”， 第 317 行，在结果中 yield ResultList(None, items_for_result(cl, res, None)) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\admin\templatetags\admin_list.py ", 第 308 行，在 init 中 super().init(*items) 文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\admin\templatetags\admin_list .py", 第 233 行，在 items_for_result 中 f, attr, value = lookup_field(field_name, result, cl.model_admin) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\admin\utils.py", 第 276 行，在lookup_field 中 attr = getattr(obj, name) 文件 "C:\Users\deant\OneDrive\Documents\Django\Aegirsoft_Garden\GardenApp\models.py", 第 201 行，在 ally_deter_pest_for y = PlantSpecies.objects.filter(self.pests) 文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\manager.py”， 第 85 行，在 manager_method 中 返回 getattr(self.get_queryset(), name)(*args, **kwargs) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\查询.py", 第 942 行，在过滤器中 return self._filter_or_exclude(False, *args, **kwargs) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\query.py", 第 962 行，在 _filter_or_exclude clone._filter_or_exclude_inplace(negate, *args, **kwargs) 文件 "C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\query.py", 第 969 行，在 _filter_or_exclude_inplace self._query.add_q(Q(*args, **kwargs)) 文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\sql\query .py", 第 1358 行，在 add_q 子句，_ = self._add_q(q_object, self.used_aliases) 文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\sql\query.py ", 第 1377 行，在 _add_q child_clause，need_inner = self.build_filter（文件“C:\Users\deant\AppData\Local\Programs\Python\Python39\lib\site-packages\django\db\models\sql\query.py”， 第 1255 行，在 build_filter arg，value = filter_expr TypeError：无法解压缩不可迭代的 ManyRelatedManager 对象 [01/Sep/2021 01:51:57] “GET /admin/GardenApp/plantspecies/HTTP/1.1" 500 400341
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