-
Notifications
You must be signed in to change notification settings - Fork 0
/
translator.py
193 lines (172 loc) · 6.04 KB
/
translator.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
from pprint import pprint
from inspect import getmembers
from django.conf import settings
from django.db.models.related import RelatedObject
from django.db.models.fields.related import RelatedField
from sqlalchemy import Table
from sqlalchemy.orm import backref, compile_mappers, mapper, relation
from sqlalchemy.orm.mapper import Mapper
DEFAULT_NO_MODEL='dyn'
def load_custom(meta,tables):
mappers = {}
for app in settings.INSTALLED_APPS:
mod = __import__( app, {}, {}, [ 'alchemy', ] )
if not hasattr( mod, 'alchemy' ):
continue
for obj in mod.alchemy.__dict__:
attr = getattr( mod.alchemy, obj )
if isinstance( attr, Table ):
meta.remove( tables[ str( attr ) ] )
tables[str( attr )] = attr.tometadata(meta)
elif isinstance( attr, Mapper ):
mappers[attr.local_table] = attr
return ( tables, mappers )
class ORMObject(object):
def __init__(self,**kwargs):
for arg in kwargs:
setattr(self,arg,kwargs[arg])
class Relation(object):
def __init__(self,model,field):
self.model = model
self.field = field
def get_backref(self):
ret = ''
if self.field.rel.multiple:
if getattr( self.field.rel, 'symmetrical', False ) and self.model == self.field.rel.to:
ret = None
ret = self.field.rel.related_name or ( self.model._meta.object_name.lower() + '_set' )
else:
ret = self.field.rel.related_name or ( self.model._meta.object_name.lower() )
return ret
def get_m2m_table(self):
if self.field.rel.multiple:
return self.field._get_m2m_db_table( self.model._meta )
return None
def add_fkey(self,kwargs,column):
if kwargs.get( 'foreign_keys' ) is None:
kwargs['foreign_keys'] = []
kwargs['foreign_keys'].append( column )
return kwargs
def props(self,tables,mt_map):
#print '\nMODEL: %s' % self.model.__name__
kwargs = {}
fn = getattr( self, self.field.__class__.__name__ )
kwargs = fn( kwargs, tables, mt_map )
brefargs = kwargs.copy()
if brefargs.get( 'secondary' ) is not None:
del brefargs['secondary']
#pprint( brefargs )
brefargs = self.switch_joins( brefargs )
kwargs['backref'] = backref( self.get_backref(), **brefargs )
kwargs = self.add_remote_side( kwargs, mt_map )
#pprint( kwargs )
return kwargs
def switch_joins(self,kwargs):
if self.field.__class__.__name__ != 'ManyToManyField':
return kwargs
prim = kwargs['primaryjoin']
kwargs['primaryjoin'] = kwargs['secondaryjoin']
kwargs['secondaryjoin'] = prim
return kwargs
def add_remote_side(self,kwargs,mt_map):
if self.model != self.field.rel.to or self.field.__class__.__name__ == 'ManyToManyField':
return kwargs
to = mt_map[self.field.rel.to]
tcol = getattr( to.c, self.field.rel.field_name )
kwargs['remote_side'] = [ tcol ]
return kwargs
def add_primary_join(self,kwargs,mt_map):
fr = mt_map[self.model]
to = mt_map[self.field.rel.to]
fcol = getattr( fr.c, self.field.get_attname() )
tcol = getattr( to.c, self.field.rel.field_name )
kwargs['primaryjoin'] = fcol==tcol
kwargs = self.add_fkey( kwargs, fcol )
return kwargs
def ForeignKey(self,kwargs,tables,mt_map):
return self.add_primary_join( kwargs, mt_map )
def OneToOneField(self,kwargs, tables, mt_map):
kwargs['uselist'] = False
return self.add_primary_join( kwargs, mt_map )
def ManyToManyField(self,kwargs,tables,mt_map):
related = RelatedObject( self.field.rel.to, self.model, self.field )
kwargs['secondary'] = tables[ self.field._get_m2m_db_table( self.model._meta ) ]
fr = mt_map[self.model]
to = tables[self.get_m2m_table()]
fcol = getattr( fr.c, self.model._meta.pk.get_attname() )
tcol = getattr( to.c, self.field._get_m2m_column_name( related ) )
kwargs['primaryjoin'] = fcol==tcol
kwargs = self.add_fkey( kwargs, tcol )
fr = to
to = mt_map[self.field.rel.to]
fcol = getattr( fr.c, self.field._get_m2m_reverse_name( related ) )
tcol = getattr( to.c, self.field.rel.to._meta.pk.get_attname() )
kwargs['secondaryjoin'] = fcol==tcol
kwargs = self.add_fkey( kwargs, fcol )
return kwargs
class Translator(object):
def __init__( self, meta, models ):
self.meta = meta
self.models = models
self.tables = {}
self.objects = {}
self.categorized = {}
self.mt_map = {}
self.mo_map = {}
self.use_django_models = getattr( settings, 'TRANQ_USE_DJANGO_MODELS', False )
for table in meta.sorted_tables:
self.tables[ str(table) ] = table
( self.tables, self.mappers ) = load_custom( self.meta, self.tables )
self.relations = self.backreferences()
for tname in self.tables:
table = self.tables[tname]
if tname in models:
model = models[tname]
app = model._meta.app_label
obj = model._meta.object_name
else:
model = None
app = getattr( settings, 'TRANQ_NO_MODEL_MODULE', DEFAULT_NO_MODEL )
obj = self.stringify( tname )
if self.categorized.get( app ) is None:
self.categorized[app] = []
if self.use_django_models and model and model is not None:
self.objects[tname] = model
else:
self.objects[tname] = type( obj, ( ORMObject, ), {} )
self.categorized[app].append( self.objects[tname] )
if model is not None:
self.mt_map[model] = table
self.mo_map[model] = self.objects[tname]
self.map()
def stringify(self,table):
ret = ''
for tok in table.split( '_' ):
ret += tok.capitalize()
return ret
def backreferences(self):
rels = {}
for name in self.models:
model = self.models[name]
for field in model._meta.local_fields + model._meta.local_many_to_many:
if field.rel:
if rels.get( model ) is None:
rels[model] = []
rels[model].append( Relation( model, field ) )
return rels
def map(self):
for table in self.tables:
if table in self.mappers:
continue
props = {}
if table in self.models and self.models[table] in self.relations:
model = self.models[table]
props = {}
for rel in self.relations[model]:
props[rel.field.name] = relation( self.mo_map[rel.field.rel.to],
**rel.props( self.tables, self.mt_map ) )
if len( props ) > 0:
mapper(self.objects[table],self.tables[table],properties=props)
else:
mapper(self.objects[table],self.tables[table])
compile_mappers()