pyrus-orm 0.0.3

Radically simple ORM for Pyrus's tasks

pyrus-orm

Radically simple, django/peewee-like, easy and incomplete ORM for Pyrus.

With pyrus-orm, you can read, create and modify tasks.

Works with pyrus-api under the hood.

This is an early development version

Features:

• Define models with:
  • simple fields (text, number, dates, ...)
  • catalog fields, single item
  • catalog fields, multiple items
  • "title" fields
• Operations with models:
  • Create and save
  • Read from registry by ID
  • Modify and save changes
• Filtering:
  • by include_archived and steps fields
  • by value of simple or catalog fields
  • less than, greater than
  • value in a list
  • ranges

Installation

pip install pyrus-orm

Examples

Define model and initialize

class Book(PyrusModel):
    title = TextField(1)  # 1 is a field ID in pyrus's form
    date = DateField(2)
    author = CatalogField(3, catalog=<catalog id>)

    class Meta:
        form_id = <form_id>


pyrus_api = PyrusAPI(...)
session = PyrusORMSession(pyrus_api)

set_session_global(session)

Create item

book = Book(
    title='Don Quixote',
    date='1605-01-01',
    author=Book.author.find({'Name': 'Alonso Fernández de Avellaneda'})
)

book.save()

book.id
>>> <task_id>

Read and modify item

book = Book.objects.get(id=...)

# simple field
book.title
>>> 'Don Quixote'
book.title = 'Don Quixote, Part Two'
book.save('title changed')

# catalog field
book.author
>>> CatalogItem(item_id=..., values={'Name': 'Alonso Fernández de Avellaneda'})  # values comes from the catalog definition

book.author.find_and_set({'Name': 'Miguel de Cervantes'})  # may raise ValueError if no value found
book.save('changed an author to the real one')

Catalog Enum fields

Enums can be mapped to catalog items by ID or by custom property name.

Enums mapped to specific catalog items ID

No catalog lookups are preformed on reading or writing of such fields.

class Genre(Enum):
    fiction = 100001
    nonfiction = 100002


class Book(PyrusModel):
    genre = CatalogEnumField(<field_id>, catalog_id=<catalog_id>, enum=Genre, id_field='item_id')

book = Book.objects.get(id=...)

book.genre
>>> Genre.fiction

book.genre = Genre.nonfiction
book.save()

book.genre
>>> Genre.nonfiction

Enums mapped to catalog item properties

(imagine book has a property 'media' with field 'Name')

class Media(Enum):
    paper = 'paper'
    papirus = 'papirus'
    pdf = 'pdf'

class Book(PyrusModel):
    media = CatalogEnumField(<field_id>, catalog_id=<catalog_id>, enum=Genre, id_field='Name')

Filtering

Only basic filtering is supported:

Book.objects.get_filtered(
    title='Don Quixote',
)
>>> [Book(...), ...]


Book.objects.get_filtered(
    genre=Book.genre.find({'Name': 'Fiction'})
)
>>> [Book(...), ...]

Book.objects.get_filtered(
    ...
    include_archived=True,
    steps=[1, 2],
)
>>> [Book(...), ...]

Catalog fields, all the API

# Read values

# Non-empty value
book.author
>>> CatalogItem(item_id=..., values={<your custom values here>})

assert bool(book.author) == True

# Empty value
book.author
>>> CatalogEmptyValue()

assert bool(book.author) == False


# Get all possible values (works for empty fields as well)
book.author.catalog()
>>> [CatalogItem(...), CatalogItem(...), ...]


# Find a value in a catalog
new_author = book.author.catalog().find({'Name': 'Miguel de Cervantes'})
new_author
>>> CatalogItem(item_id=..., values={'Name': 'Miguel de Cervantes'})  # or None

book.author = new_author
book.save()


# Find and set shortcut
book.author.catalog().find_and_set({'Name': 'William Shakespeare'})

book.author.find_and_set({'Name': 'NonExistent'})
>>> ValueError raised


# Set value to a specific item_id
book.author = CatalogItem(item_id=123456)