Source code for openlp.plugins.songs.lib.db

# -*- coding: utf-8 -*-
# vim: autoindent shiftwidth=4 expandtab textwidth=120 tabstop=4 softtabstop=4

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# OpenLP - Open Source Lyrics Projection                                      #
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# Copyright (c) 2008-2017 OpenLP Developers                                   #
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"""
The :mod:`db` module provides the database and schema that is the backend for
the Songs plugin
"""

from sqlalchemy import Column, ForeignKey, Table, types
from sqlalchemy.orm import mapper, relation, reconstructor
from sqlalchemy.sql.expression import func, text

from openlp.core.lib.db import BaseModel, init_db
from openlp.core.common.languagemanager import get_natural_key
from openlp.core.lib import translate


[docs]class Author(BaseModel): """ Author model """
[docs] def get_display_name(self, author_type=None): if author_type: return "{name} ({author})".format(name=self.display_name, author=AuthorType.Types[author_type]) return self.display_name
[docs]class AuthorSong(BaseModel): """ Relationship between Authors and Songs (many to many). Need to define this relationship table explicit to get access to the Association Object (author_type). http://docs.sqlalchemy.org/en/latest/orm/relationships.html#association-object """ pass
[docs]class AuthorType(object): """ Enumeration for Author types. They are defined by OpenLyrics: http://openlyrics.info/dataformat.html#authors The 'words+music' type is not an official type, but is provided for convenience. """ NoType = '' Words = 'words' Music = 'music' WordsAndMusic = 'words+music' Translation = 'translation' Types = { NoType: '', Words: translate('SongsPlugin.AuthorType', 'Words', 'Author who wrote the lyrics of a song'), Music: translate('SongsPlugin.AuthorType', 'Music', 'Author who wrote the music of a song'), WordsAndMusic: translate('SongsPlugin.AuthorType', 'Words and Music', 'Author who wrote both lyrics and music of a song'), Translation: translate('SongsPlugin.AuthorType', 'Translation', 'Author who translated the song') } SortedTypes = [ NoType, Words, Music, WordsAndMusic, Translation ] TranslatedTypes = [ Types[NoType], Types[Words], Types[Music], Types[WordsAndMusic], Types[Translation] ]
[docs] @staticmethod def from_translated_text(translated_type): """ Get the AuthorType from a translated string. :param translated_type: Translated Author type. """ for key, value in AuthorType.Types.items(): if value == translated_type: return key return AuthorType.NoType
[docs]class Book(BaseModel): """ Book model """ def __repr__(self): return '<Book id="{myid:d}" name="{name}" publisher="{publisher}" />'.format(myid=self.id, name=self.name, publisher=self.publisher)
[docs]class MediaFile(BaseModel): """ MediaFile model """ pass
[docs]class Song(BaseModel): """ Song model """ def __init__(self): self.sort_key = []
[docs] @reconstructor def init_on_load(self): """ Precompute a natural sorting, locale aware sorting key. Song sorting is performance sensitive operation. To get maximum speed lets precompute the sorting key. """ self.sort_key = get_natural_key(self.title)
[docs] def add_author(self, author, author_type=None): """ Add an author to the song if it not yet exists :param author: Author object :param author_type: AuthorType constant or None """ for author_song in self.authors_songs: if author_song.author == author and author_song.author_type == author_type: return new_author_song = AuthorSong() new_author_song.author = author new_author_song.author_type = author_type self.authors_songs.append(new_author_song)
[docs] def remove_author(self, author, author_type=None): """ Remove an existing author from the song :param author: Author object :param author_type: AuthorType constant or None """ for author_song in self.authors_songs: if author_song.author == author and author_song.author_type == author_type: self.authors_songs.remove(author_song) return
[docs] def add_songbook_entry(self, songbook, entry): """ Add a Songbook Entry to the song if it not yet exists :param songbook_name: Name of the Songbook. :param entry: Entry in the Songbook (usually a number) """ for songbook_entry in self.songbook_entries: if songbook_entry.songbook.name == songbook.name and songbook_entry.entry == entry: return new_songbook_entry = SongBookEntry() new_songbook_entry.songbook = songbook new_songbook_entry.entry = entry self.songbook_entries.append(new_songbook_entry)
[docs]class SongBookEntry(BaseModel): """ SongBookEntry model """ def __repr__(self): return SongBookEntry.get_display_name(self.songbook.name, self.entry)
[docs] @staticmethod def get_display_name(songbook_name, entry): if entry: return "{name} #{entry}".format(name=songbook_name, entry=entry) return songbook_name
[docs]class Topic(BaseModel): """ Topic model """ pass
[docs]def init_schema(url): """ Setup the songs database connection and initialise the database schema. :param url: The database to setup The song database contains the following tables: * authors * authors_songs * media_files * media_files_songs * song_books * songs * songs_songbooks * songs_topics * topics **authors** Table This table holds the names of all the authors. It has the following columns: * id * first_name * last_name * display_name **authors_songs Table** This is a bridging table between the *authors* and *songs* tables, which serves to create a many-to-many relationship between the two tables. It has the following columns: * author_id * song_id * author_type **media_files Table** * id * file_name * type **song_books Table** The *song_books* table holds a list of books that a congregation gets their songs from, or old hymnals now no longer used. This table has the following columns: * id * name * publisher **songs Table** This table contains the songs, and each song has a list of attributes. The *songs* table has the following columns: * id * title * alternate_title * lyrics * verse_order * copyright * comments * ccli_number * theme_name * search_title * search_lyrics **songs_songsbooks Table** This is a mapping table between the *songs* and the *song_books* tables. It has the following columns: * songbook_id * song_id * entry # The song number, like 120 or 550A **songs_topics Table** This is a bridging table between the *songs* and *topics* tables, which serves to create a many-to-many relationship between the two tables. It has the following columns: * song_id * topic_id **topics Table** The topics table holds a selection of topics that songs can cover. This is useful when a worship leader wants to select songs with a certain theme. This table has the following columns: * id * name """ session, metadata = init_db(url) # Definition of the "authors" table authors_table = Table( 'authors', metadata, Column('id', types.Integer(), primary_key=True), Column('first_name', types.Unicode(128)), Column('last_name', types.Unicode(128)), Column('display_name', types.Unicode(255), index=True, nullable=False) ) # Definition of the "media_files" table media_files_table = Table( 'media_files', metadata, Column('id', types.Integer(), primary_key=True), Column('song_id', types.Integer(), ForeignKey('songs.id'), default=None), Column('file_name', types.Unicode(255), nullable=False), Column('type', types.Unicode(64), nullable=False, default='audio'), Column('weight', types.Integer(), default=0) ) # Definition of the "song_books" table song_books_table = Table( 'song_books', metadata, Column('id', types.Integer(), primary_key=True), Column('name', types.Unicode(128), nullable=False), Column('publisher', types.Unicode(128)) ) # Definition of the "songs" table songs_table = Table( 'songs', metadata, Column('id', types.Integer(), primary_key=True), Column('title', types.Unicode(255), nullable=False), Column('alternate_title', types.Unicode(255)), Column('lyrics', types.UnicodeText, nullable=False), Column('verse_order', types.Unicode(128)), Column('copyright', types.Unicode(255)), Column('comments', types.UnicodeText), Column('ccli_number', types.Unicode(64)), Column('theme_name', types.Unicode(128)), Column('search_title', types.Unicode(255), index=True, nullable=False), Column('search_lyrics', types.UnicodeText, nullable=False), Column('create_date', types.DateTime(), default=func.now()), Column('last_modified', types.DateTime(), default=func.now(), onupdate=func.now()), Column('temporary', types.Boolean(), default=False) ) # Definition of the "topics" table topics_table = Table( 'topics', metadata, Column('id', types.Integer(), primary_key=True), Column('name', types.Unicode(128), index=True, nullable=False) ) # Definition of the "authors_songs" table authors_songs_table = Table( 'authors_songs', metadata, Column('author_id', types.Integer(), ForeignKey('authors.id'), primary_key=True), Column('song_id', types.Integer(), ForeignKey('songs.id'), primary_key=True), Column('author_type', types.Unicode(255), primary_key=True, nullable=False, server_default=text('""')) ) # Definition of the "songs_songbooks" table songs_songbooks_table = Table( 'songs_songbooks', metadata, Column('songbook_id', types.Integer(), ForeignKey('song_books.id'), primary_key=True), Column('song_id', types.Integer(), ForeignKey('songs.id'), primary_key=True), Column('entry', types.Unicode(255), primary_key=True, nullable=False) ) # Definition of the "songs_topics" table songs_topics_table = Table( 'songs_topics', metadata, Column('song_id', types.Integer(), ForeignKey('songs.id'), primary_key=True), Column('topic_id', types.Integer(), ForeignKey('topics.id'), primary_key=True) ) mapper(Author, authors_table, properties={ 'songs': relation(Song, secondary=authors_songs_table, viewonly=True) }) mapper(AuthorSong, authors_songs_table, properties={ 'author': relation(Author) }) mapper(SongBookEntry, songs_songbooks_table, properties={ 'songbook': relation(Book) }) mapper(Book, song_books_table) mapper(MediaFile, media_files_table) mapper(Song, songs_table, properties={ # Use the authors_songs relation when you need access to the 'author_type' attribute # or when creating new relations 'authors_songs': relation(AuthorSong, cascade="all, delete-orphan"), # Use lazy='joined' to always load authors when the song is fetched from the database (bug 1366198) 'authors': relation(Author, secondary=authors_songs_table, viewonly=True, lazy='joined'), 'media_files': relation(MediaFile, backref='songs', order_by=media_files_table.c.weight), 'songbook_entries': relation(SongBookEntry, backref='song', cascade='all, delete-orphan'), 'topics': relation(Topic, backref='songs', secondary=songs_topics_table) }) mapper(Topic, topics_table) metadata.create_all(checkfirst=True) return session