76 lines
2.5 KiB
Python
76 lines
2.5 KiB
Python
from sqlalchemy import (Table, MetaData, Column, ForeignKey, Integer, String, Boolean, Text,
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DateTime, BigInteger, Index)
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from peewee import (PrimaryKeyField, CharField, BooleanField, DateTimeField, TextField,
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ForeignKeyField, BigIntegerField, IntegerField)
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OPTIONS_TO_COPY = [
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'null',
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'default',
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'primary_key',
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]
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OPTION_TRANSLATIONS = {
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'null': 'nullable',
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}
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def gen_sqlalchemy_metadata(peewee_model_list):
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metadata = MetaData()
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for model in peewee_model_list:
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meta = model._meta
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all_indexes = set(meta.indexes)
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columns = []
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for field in meta.get_fields():
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alchemy_type = None
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col_args = []
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col_kwargs = {}
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if isinstance(field, PrimaryKeyField):
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alchemy_type = Integer
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elif isinstance(field, CharField):
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alchemy_type = String(field.max_length)
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elif isinstance(field, BooleanField):
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alchemy_type = Boolean
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elif isinstance(field, DateTimeField):
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alchemy_type = DateTime
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elif isinstance(field, TextField):
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alchemy_type = Text
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elif isinstance(field, ForeignKeyField):
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alchemy_type = Integer
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target_name = '%s.%s' % (field.to_field.model_class._meta.db_table,
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field.to_field.db_column)
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col_args.append(ForeignKey(target_name))
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all_indexes.add(((field.name, ), field.unique))
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elif isinstance(field, BigIntegerField):
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alchemy_type = BigInteger
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elif isinstance(field, IntegerField):
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alchemy_type = Integer
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else:
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raise RuntimeError('Unknown column type: %s' % field)
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for option_name in OPTIONS_TO_COPY:
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alchemy_option_name = (OPTION_TRANSLATIONS[option_name]
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if option_name in OPTION_TRANSLATIONS else option_name)
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if alchemy_option_name not in col_kwargs:
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option_val = getattr(field, option_name)
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col_kwargs[alchemy_option_name] = option_val
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if field.unique or field.index:
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all_indexes.add(((field.name, ), field.unique))
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new_col = Column(field.db_column, alchemy_type, *col_args, **col_kwargs)
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columns.append(new_col)
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new_table = Table(meta.db_table, metadata, *columns)
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for col_prop_names, unique in all_indexes:
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col_names = [meta.fields[prop_name].db_column for prop_name in col_prop_names]
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index_name = '%s_%s' % (meta.db_table, '_'.join(col_names))
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col_refs = [getattr(new_table.c, col_name) for col_name in col_names]
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Index(index_name, *col_refs, unique=unique)
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return metadata
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