如何在Flask Eve中插入包含dicts和列表的记录?

时间:2016-03-15 18:01:08

标签: python flask eve

我使用Flask-Eve为我的数据提供API。我想使用Eve插入我的记录,以便获得_created属性和其他Eve添加的属性。

我的两个字段是dicts,一个是列表。当我试图将它插入Eve时,结构似乎变得平坦,失去了一些信息。试着告诉夏娃关于这个词典和&列表元素在POST上给我一个错误,说这些字段需要是dicts和列表,但它们已经是!有人可以帮助我吗?告诉我我做错了什么?

My Eve conf看起来像这样:

'myendpoint': { 'allow_unknown': True,
                   'schema': { 'JobTitle': { 'type':       'string',
                                             'required':       True,
                                             'empty':         False,
                                             'minlength':         3,
                                             'maxlength':        99 },
                                'JobDescription': { 'type': 'string',
                                                    'required':       True,
                                                    'empty':         False,
                                                    'minlength':        32,
                                                    'maxlength':        102400 },
                           },
               },

但是当我使用请求发布以下结构时:

{
        "_id" : ObjectId("56e840686dbf9a5fe069220e"),
        "Salary" : {
                "OtherPay" : "On Application"
        },
        "ContactPhone" : "xx",
        "JobTypeCodeList" : [
                "Public Sector",
                "Other"
        ],
        "CompanyName" : "Scc",
        "url" : "xx",
        "JobTitle" : "xxx",
        "WebAdID" : "TA7494725_1_1",
        "JobDescription" : "xxxx",
        "JobLocation" : {
                "DisplayCity" : "BRIDGWATER",
                "City" : "BRIDGWATER",
                "StateProvince" : "Somerset",
                "Country" : "UK",
                "PostalCode" : "TA6"
        },
        "CustomField1" : "Permanent",
        "CustomField3" : "FTJOBUKNCSG",
        "WebAdManagerEmail" : "xxxx",
        "JobType" : "Full",
        "ProductID" : "JCPRI0UK"
}

帖子行如下:

resp = requests.post(url, data = job)

它变得扁平化了#39;并丢失来自dicts和list的信息:

{
        "_id" : ObjectId("56e83f5a6dbf9a6395ea559d"),
        "Salary" : "OtherPay",
        "_updated" : ISODate("2016-03-15T16:59:06Z"),
        "ContactPhone" : "xx",
        "JobTypeCodeList" : "Public Sector",
        "CompanyName" : "Scc",
        "url" : "xxx",
        "JobTitle" : "xx",
        "WebAdID" : "TA7494725_1_1",
        "JobDescription" : "xxx",
        "JobLocation" : "DisplayCity",
        "CustomField1" : "Permanent",
        "_created" : ISODate("2016-03-15T16:59:06Z"),
        "CustomField3" : "FTJOBUKNCSG",
        "_etag" : "55d8d394141652f5dc2892a900aa450403a63d10",
        "JobType" : "Full",
        "ProductID" : "JCPRI0UK"
}

我尝试更新我的架构,说一些是dicts和list:

     'JobTypeCodeList': { 'type': 'list'},
     'Salary':          { 'type': 'dict'},
     'JobLocation':     { 'type': 'dict'},

但是当我在新记录中发帖时,我得到一个错误说

 {u'Salary': u'must be of dict type', u'JobTypeCodeList': u'must be of list type', u'JobLocation': u'must be of dict type'},

我在POST之前验证了type(job.Salary) == dict等,所以我不确定如何解决这个问题。虽然我可以将记录直接发布到MongoDB中,但是绕过夏娃,如果可能的话,我更愿意使用Eve。

1 个答案:

答案 0 :(得分:0)

如果这对其他人有用,我最后通过在Eve中发布一个平面结构来解决这个问题,然后使用on_insert和on_update事件来遍历键并从中构造对象(和列表)。

它有点令人费解,但它确实有效,现在它已经到位,它使用起来相当透明。我通过Eve添加到MongoDB的对象现在已经嵌入了列表和哈希,但它们也获得了方便的Eve属性,如_created和_updated,而POST和PATCH请求也通过Eve的正常模式得到验证。

唯一真正尴尬的事情是on_insert和on_update发送了稍微不同的参数,所以在我下面的代码中有很多重复,我还没有重构过。

任何字符都可以用作标志:我使用两个下划线来表示最终应该作为单个对象的键/值,以及两个用于应该拆分成列表的符号的&符号。我现在发布的结构如下所示:

    "Salary__OtherPay" : "On Application"
    "ContactPhone" : "xx",
    "JobTypeCodeList" : "Public Sector&&Other",
    "CompanyName" : "Scc",
    "url" : "xx",
    "JobTitle" : "xxx",
    "WebAdID" : "TA7494725_1_1",
    "JobDescription" : "xxxx",
    "JobLocation__DisplayCity" : "BRIDGWATER",
    "JobLocation__City" : "BRIDGWATER",
    "JobLocation__StateProvince" : "Somerset",
    "JobLocation__Country" : "UK",
    "JobLocation__PostalCode" : "TA6"
    "CustomField1" : "Permanent",
    "CustomField3" : "FTJOBUKNCSG",
    "WebAdManagerEmail" : "xxxx",
    "JobType" : "Full",
    "ProductID" : "JCPRI0UK"

我的Eve模式已相应更新,以验证这些新密钥名称的值。然后在后端我定义了下面的函数,它检查传入的键/值并将它们转换为对象/列表,并删除原始__和&&数据:

import re

def flat_to_complex(items=None, orig=None):

    if type(items) is dict: # inserts of new objects
        if True: # just to force indentation
            objects = {} # hash-based container for each object
            lists   = {} # hash-based container for each list

            for key,value in items.items():
                has_object_wildcard = re.search(r'^([^_]+)__', key, re.IGNORECASE)
                if bool(has_object_wildcard):
                    objects[has_object_wildcard.group(1)] = None
                elif bool(re.search(r'&&', unicode(value))):
                    lists[key] = str(value).split('&&')

            for list_name, this_list in lists.items():
                items[list_name] = this_list

            for obj_name in objects:

                this_obj = {}
                for key,value in items.items():
                    if key.startswith('{s}__'.format(s=obj_name)):
                        match = re.search(r'__(.+)$', key)
                        this_obj[match.group(1)] = value
                        del(items[key])

                objects[obj_name] = this_obj

            for obj_name, this_obj in objects.items():
                items[obj_name] = this_obj

    elif type(items) is list: # updates to existing objects
        for idx in range(len(items)):
            if type(items[idx]) is dict:
                objects = {} # hash-based container for each object
                lists   = {} # hash-based container for each list

                for key,value in items[idx].items():
                    has_object_wildcard = re.search(r'^([^_]+)__', key, re.IGNORECASE)
                    if bool(has_object_wildcard):
                        objects[has_object_wildcard.group(1)] = None
                    elif bool(re.search(r'&&', unicode(value))):
                        lists[key] = str(value).split('&&')

                for list_name, this_list in lists.items():
                    items[idx][list_name] = this_list

                for obj_name in objects:

                    this_obj = {}
                    for key,value in items[idx].items():
                        if key.startswith('{s}__'.format(s=obj_name)):
                            match = re.search(r'__(.+)$', key)
                            this_obj[match.group(1)] = value
                            del(items[idx][key])

                    objects[obj_name] = this_obj

                for obj_name, this_obj in objects.items():
                    items[idx][obj_name] = this_obj

然后我告诉Eve在该集合的插入和更新上运行该函数:

app.on_insert_myendpoint += flat_to_complex
app.on_update_myendpoint += flat_to_complex

这实现了我所需要的,并且Mongo中的结果记录与上面的问题中的结果相同(使用_created和_updated属性)。它显然不理想,但它实现了它,并且一旦它到位就很容易合作。