xia_meta.meta.Meta

class xia_meta.meta.Meta(**kwargs)

Bases: Document

__init__(**kwargs)

Methods

__init__(**kwargs)
delete([cascade])	Delete a document
delete_all()	Delete every instance of this document type
drop()	Drop the collection
from_db(**kwargs)	Transform database data to internal data
from_display(**kwargs)	Transform Display data to internal data
get_collection_name()	Get collection name of current class
get_display_data([lazy])	Get Display data (visualized form of data)
get_id()	Get document id
get_raw_data()	Get Raw data (materialized form of data)
get_runtime_data()	Get Runtime data (calculated from raw data when runtime is activated)
get_sample()	Get a sample document data
list(owner_name[, limit])	List objects of predefined criteria, default limited to 10 objects
load(*args, **kwargs)	Load a Document from engine
objects(**kwargs)	Search documents
reload()	Reload the document from the engine
save([validate, cascade])	Save a document to engine
to_db([ignore_unknown, no_class])	Translate the runtime data into raw data (materialized form of data)
update([validate, cascade])	Update existed fields
validate()	Validate if all of the component of document follows the predefined rules

Attributes

cluster_fields	Cluster Fields
key_fields	Key Fields
logger
name
owner_name
partition_info	Partition information
reverse_delete_rules

cluster_fields = []

Cluster Fields

delete(cascade: bool = True)

Delete a document

Parameters

cascade (bool) – Activate the cascade delete

classmethod delete_all()

Delete every instance of this document type

classmethod drop()

Drop the collection

Hard way to delete the collection. No cascade relation will be considered

classmethod from_db(**kwargs)

Transform database data to internal data

Parameters

**kwargs (object) – python dict got from system

Returns

python dict object

classmethod from_display(**kwargs)

Transform Display data to internal data

Parameters

**kwargs (object) – display object got from front end

Returns

python dict object

classmethod get_collection_name()

Get collection name of current class

Returns

collection name

Return type

str

get_display_data(lazy: bool = True)

Get Display data (visualized form of data)

Returns

python dict object

Notes

We will return the detail form if it is possible

get_id()

Get document id

Returns

Document ID

Return type

str

get_raw_data()

Get Raw data (materialized form of data)

Returns

python dict object

get_runtime_data()

Get Runtime data (calculated from raw data when runtime is activated)

Returns

python dict object

classmethod get_sample()

Get a sample document data

key_fields = []

Key Fields

classmethod list(owner_name: str, limit: int = 10, **kwargs)

List objects of predefined criteria, default limited to 10 objects

classmethod load(*args, **kwargs)

Load a Document from engine

Parameters

• *args – a list document id (should only have one valid)

• **kwargs –

Returns

loaded document instance

classmethod objects(**kwargs)

Search documents

Parameters

**kwargs – Search Configuration

Returns

generator of a found document

Notes

• key, str pair: single value search

• key, list pair: array_contains_any search

• embedded search: a__b means b component of a. a.b means the key’s name is a.b

• operators: key is end with __op__. The following op are supported:

  • __eq__: Could ignore because it is a by default behavior

  • __lt__, __le__, __gt__, __ge__, __ne__: as is supposed by the name

  • __asc__, __desc__: the result will be ordered by the fields

partition_info = {}

Partition information

reload()

Reload the document from the engine

Returns

itself with refreshed data

save(validate: bool = True, cascade: bool = True)

Save a document to engine

Parameters

• validate (bool) – Should the validation to be passed or not

• cascade (bool) – Save cascaded document

Returns

itself (with document id in the case of a new created document)

to_db(ignore_unknown: bool = False, no_class: bool = False)

Translate the runtime data into raw data (materialized form of data)

Parameters

• no_class (bool) – Don’t save the class name into document

• ignore_unknown (bool) – When a field is not defined in the document, should we send it back to the database

Returns

python dict object

update(validate=True, cascade: bool = True, **kwargs)

Update existed fields

Parameters

• validate (bool) – Should the data be validated before update or not

• cascade (bool) – Activate the cascade update / delete

• **kwargs – update parameters

Returns

updated document in the form of python object

Notes

Update String Specifications * embedded update: a__b means b component of a. a.b means the key’s name is a.b * operators: key is end with __op__. The following op are supported:

• __append__: Append an item to array

• __remove__: Remove an item

• __delete__: Delete the field

Notes

We need to update the data from all sources

validate()

Validate if all of the component of document follows the predefined rules

Returns

Always None. No exception raised means the validation passed