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# -*- coding: UTF-8 -*- 

# Copyright 2009-2016 by Luc Saffre. 

# License: BSD, see file LICENSE for more details. 

 

""" 

Documented in :ref:`dpy`. 

 

""" 

 

from __future__ import unicode_literals 

from __future__ import print_function 

from future import standard_library 

standard_library.install_aliases() 

from builtins import str 

from past.builtins import basestring 

from builtins import object 

 

import logging 

logger = logging.getLogger(__name__) 

 

 

from io import StringIO 

import os 

import imp 

from decimal import Decimal 

from lino import AFTER17 

 

from django.conf import settings 

from django.db import models 

from django.db.models import ForeignKey 

 

from django.utils.module_loading import import_string 

 

from django.db import IntegrityError 

from django.db.models.fields import NOT_PROVIDED 

from django.core.serializers import base 

from django.core.exceptions import ValidationError, ObjectDoesNotExist 

from django.utils.encoding import smart_text, is_protected_type, force_text 

from django.utils import translation 

 

from lino.utils.mldbc.fields import BabelCharField, BabelTextField 

from lino.core.choicelists import ChoiceListField 

from lino.core.utils import obj2str, sorted_models_list, full_model_name 

 

SUFFIX = '.py' 

 

 

def create_mti_child(parent_model, pk, child_model, **kw): 

    """Similar to :func:`lino.utils.mti.insert_child`, but very tricky. 

    Used in Python dumps. 

 

    The return value is an "almost normal" model instance, whose 

    `save` and `full_clean` methods have been hacked.  These are the 

    only methods that will be called by :class:`Deserializer`.  You 

    should not use this instance for anything else and throw it away 

    when the save() has been called. 

 

    """ 

    parent_link_field = child_model._meta.parents.get(parent_model, None) 

    if parent_link_field is None: 

        raise ValidationError("A %s cannot be parent for a %s" % ( 

            parent_model.__name__, child_model.__name__)) 

    ignored = {} 

    for f in parent_model._meta.fields: 

        if f.name in kw: 

            ignored[f.name] = kw.pop(f.name) 

    kw[parent_link_field.name + "_id"] = pk 

    if ignored: 

        raise Exception( 

            "create_mti_child() %s %s from %s : " 

            "ignored non-local fields %s" % ( 

                child_model.__name__, 

                pk, 

                parent_model.__name__, 

                ignored)) 

    child_obj = child_model(**kw) 

 

    def full_clean(*args, **kw): 

        pass 

 

    def save(*args, **kw): 

        kw.update(raw=True, force_insert=True) 

        child_obj.save_base(**kw) 

 

    child_obj.save = save 

    child_obj.full_clean = full_clean 

    return child_obj 

 

 

class Serializer(base.Serializer): 

    """Serializes a QuerySet to a py stream. 

 

    Usage: ``manage.py dumpdata --format py`` 

 

    DEPRECATED. The problem with this approach is that a serializer 

    creates -by definition- one single file. And Python needs 

    -understandably- to load a module completely into memory before it 

    can be executed.  Use :manage:`dump2py` instead. 

 

    """ 

 

    internal_use_only = False 

 

    write_preamble = True  # may be set to False e.g. by testcases 

    models = None 

 

    def serialize(self, queryset, **options): 

        from django.contrib.sessions.models import Session 

        from django.contrib.contenttypes.models import ContentType 

        self.options = options 

 

        self.stream = options.get("stream", StringIO()) 

        self.selected_fields = options.get("fields") 

        self.use_natural_keys = options.get("use_natural_keys", False) 

        if self.write_preamble: 

            current_version = settings.SITE.version 

            if '+' in current_version: 

                logger.warning( 

                    "Dumpdata from intermediate version %s" % current_version) 

 

            self.stream.write('# -*- coding: UTF-8 -*-\n') 

            self.stream.write('''\ 

""" 

This is a `Python dump created using %s. 

''' % settings.SITE.using_text()) 

            #~ self.stream.write(settings.SITE.welcome_text()) 

            self.stream.write(''' 

""" 

from __future__ import unicode_literals 

''') 

            self.stream.write('SOURCE_VERSION = %r\n' % str(current_version)) 

            self.stream.write('from decimal import Decimal\n') 

            self.stream.write('from datetime import datetime as dt\n') 

            self.stream.write('from datetime import time,date\n') 

            self.stream.write('from lino.utils.dpy import create_mti_child\n') 

            self.stream.write('from lino.utils.dbutils import resolve_model\n') 

            self.stream.write( 

                'from lino.modlib.gfks.models import ContentType\n') 

            self.stream.write('from django.conf import settings\n') 

            self.stream.write(''' 

             

def new_content_type_id(m): 

    if m is None: return m 

    # if not fmn: return None 

    # m = resolve_model(fmn) 

    ct = ContentType.objects.get_for_model(m) 

    if ct is None: return None 

    return ct.pk 

     

''') 

            #~ s = ','.join([ 

              #~ '%s=values[%d]' % (k,i) 

                #~ for i,k in enumerate(settings.SITE.AVAILABLE_LANGUAGES)]) 

            s = ','.join([ 

                '%s=values[%d]' % (lng.name, lng.index) 

                for lng in settings.SITE.languages]) 

            self.stream.write(''' 

def bv2kw(fieldname,values): 

    """ 

    Needed if `Site.languages` changed between dumpdata and loaddata 

    """ 

    return settings.SITE.babelkw(fieldname,%s) 

     

''' % s) 

        #~ model = queryset.model 

        if self.models is None: 

            self.models = sorted_models_list()  # models.get_models() 

        if self.write_preamble: 

            for model in self.models: 

                self.stream.write('%s = resolve_model("%s")\n' % ( 

                    full_model_name(model, '_'), full_model_name(model))) 

        self.stream.write('\n') 

        for model in self.models: 

            fields = [f for f, 

                      m in model._meta.get_fields_with_model() if m is None] 

            for f in fields: 

                if getattr(f, 'auto_now_add', False): 

                    raise Exception("%s.%s.auto_now_add is True : values will be lost!" % ( 

                        full_model_name(model), f.name)) 

            field_names = [f.attname for f in fields 

                           if not getattr(f, '_lino_babel_field', False)] 

            self.stream.write('def create_%s(%s):\n' % ( 

                model._meta.db_table, ', '.join(field_names))) 

            if model._meta.parents: 

                if len(model._meta.parents) != 1: 

                    msg = "%s : model._meta.parents is %r" % ( 

                        model, model._meta.parents) 

                    raise Exception(msg) 

                pm, pf = list(model._meta.parents.items())[0] 

                child_fields = [f for f in fields if f != pf] 

                if child_fields: 

                    attrs = ', ' + ', '.join([ 

                        '%s=%s' % (f.attname, f.attname) 

                        for f in child_fields]) 

                else: 

                    attrs = '' 

                tpl = '    return create_mti_child(%s, %s, %s%s)\n' 

                self.stream.write(tpl % ( 

                    full_model_name(pm, '_'), 

                    pf.attname, full_model_name(model, '_'), attrs)) 

            else: 

                self.stream.write("    kw = dict()\n") 

                for f in fields: 

                    if getattr(f, '_lino_babel_field', False): 

                        continue 

                    elif isinstance(f, (BabelCharField, BabelTextField)): 

                        tpl = '    if %s is not None:' 

                        tpl += ' kw.update(bv2kw(%r, %s))\n' 

                        self.stream.write( 

                            tpl % (f.attname, f.attname, f.attname)) 

                    else: 

                        if isinstance(f, models.DecimalField): 

                            self.stream.write( 

                                '    if %s is not None: %s = Decimal(%s)\n' % ( 

                                    f.attname, f.attname, f.attname)) 

                        elif isinstance(f, ChoiceListField): 

                            lstname = 'settings.SITE.modules.{0}.{1}'.format( 

                                f.choicelist.app_label, f.choicelist.__name__) 

                            ln = '    if {0}: {0} = {1}.get_by_value({0})\n' 

                            self.stream.write(ln.format(f.attname, lstname)) 

                        elif isinstance(f, ForeignKey): 

                            if f.rel.model is ContentType: 

                                self.stream.write( 

                                    '    %s = new_content_type_id(%s)\n' % ( 

                                        f.attname, f.attname)) 

                        self.stream.write( 

                            '    kw.update(%s=%s)\n' % (f.attname, f.attname)) 

 

                self.stream.write('    return %s(**kw)\n\n' % 

                                  full_model_name(model, '_')) 

        #~ self.start_serialization() 

        self.stream.write('\n') 

        model = None 

        all_models = [] 

        for obj in queryset: 

            if isinstance(obj, ContentType): 

                continue 

            if isinstance(obj, Session): 

                continue 

            if obj.__class__ != model: 

                model = obj.__class__ 

                if model in all_models: 

                    raise Exception("%s instances weren't grouped!" % model) 

                all_models.append(model) 

                self.stream.write('\ndef %s_objects():\n' % 

                                  model._meta.db_table) 

            fields = [f for f, 

                      m in model._meta.get_fields_with_model() if m is None] 

            fields = [ 

                f for f in fields if not getattr(f, '_lino_babel_field', False)] 

            self.stream.write('    yield create_%s(%s)\n' % ( 

                obj._meta.db_table, 

                ','.join([self.value2string(obj, f) for f in fields]))) 

        self.stream.write('\n\ndef objects():\n') 

        all_models = self.sort_models(all_models) 

        for model in all_models: 

            #~ self.stream.write('    for o in %s_objects(): yield o\n' % model._meta.db_table) 

            self.stream.write('    yield %s_objects()\n' % 

                              model._meta.db_table) 

        # self.stream.write('\nsettings.SITE.install_migrations(globals())\n') 

 

    def sort_models(self, unsorted): 

        sorted = [] 

        hope = True 

        """ 

        20121120 if we convert the list to a set, we gain some performance  

        for the ``in`` tests, but we obtain a random sorting order for all  

        independent models, making the double dump test less evident. 

        """ 

        #~ 20121120 unsorted = set(unsorted) 

        while len(unsorted) and hope: 

            hope = False 

            guilty = dict() 

            #~ print "hope for", [m.__name__ for m in unsorted] 

            for model in unsorted: 

                deps = set([f.rel.model 

                            for f in model._meta.fields 

                            if f.rel is not None and f.rel.model is not model and f.rel.model in unsorted]) 

                #~ deps += [m for m in model._meta.parents.keys()] 

                for m in sorted: 

                    if m in deps: 

                        deps.remove(m) 

                if len(deps): 

                    guilty[model] = deps 

                else: 

                    sorted.append(model) 

                    unsorted.remove(model) 

                    hope = True 

                    break 

 

                #~ ok = True 

                #~ for d in deps: 

                    #~ if d in unsorted: 

                        #~ ok = False 

                #~ if ok: 

                    #~ sorted.append(model) 

                    #~ unsorted.remove(model) 

                    #~ hope = True 

                    #~ break 

                #~ else: 

                    #~ guilty[model] = deps 

                #~ print model.__name__, "depends on", [m.__name__ for m in deps] 

        if unsorted: 

            assert len(unsorted) == len(guilty) 

            msg = "There are %d models with circular dependencies :\n" % len( 

                unsorted) 

            msg += "- " + '\n- '.join([ 

                full_model_name(m) + ' (depends on %s)' % ", ".join([full_model_name(d) for d in deps]) for m, deps in list(guilty.items())]) 

            for ln in msg.splitlines(): 

                self.stream.write('\n    # %s' % ln) 

            logger.info(msg) 

            sorted.extend(unsorted) 

        return sorted 

 

    #~ def start_serialization(self): 

        #~ self._current = None 

        #~ self.objects = [] 

    #~ def end_serialization(self): 

        #~ pass 

    #~ def start_object(self, obj): 

        #~ self._current = {} 

    #~ def end_object(self, obj): 

        #~ self.objects.append({ 

            #~ "model"  : smart_text(obj._meta), 

            #~ "pk"     : smart_text(obj._get_pk_val(), strings_only=True), 

            #~ "fields" : self._current 

        #~ }) 

        #~ self._current = None 

    def value2string(self, obj, field): 

        from django.contrib.contenttypes.models import ContentType 

        if isinstance(field, (BabelCharField, BabelTextField)): 

            return repr(settings.SITE.field2args(obj, field.name)) 

        value = field._get_val_from_obj(obj) 

        # Protected types (i.e., primitives like None, numbers, dates, 

        # and Decimals) are passed through as is. All other values are 

        # converted to string first. 

        if value is None: 

        #~ if value is None or value is NOT_PROVIDED: 

            return 'None' 

        if isinstance(field, models.DateTimeField): 

            d = value 

            return 'dt(%d,%d,%d,%d,%d,%d)' % ( 

                d.year, d.month, d.day, d.hour, d.minute, d.second) 

        if isinstance(field, models.TimeField): 

            d = value 

            return 'time(%d,%d,%d)' % (d.hour, d.minute, d.second) 

        if isinstance(field, ForeignKey) and field.rel.model is ContentType: 

            ct = ContentType.objects.get(pk=value) 

            return full_model_name(ct.model_class(), '_') 

            #~ return "'"+full_model_name(ct.model_class())+"'" 

            #~ return repr(tuple(value.app_label,value.model)) 

        if isinstance(field, models.DateField): 

            d = value 

            return 'date(%d,%d,%d)' % (d.year, d.month, d.day) 

            #~ return 'i2d(%4d%02d%02d)' % (d.year,d.month,d.day) 

        if isinstance(value, (float, Decimal)): 

            return repr(str(value)) 

        if isinstance(value, int): 

            return str(value) 

        return repr(field.value_to_string(obj)) 

 

    def handle_fk_field(self, obj, field): 

        related = getattr(obj, field.name) 

        if related is not None: 

            if self.use_natural_keys and hasattr(related, 'natural_key'): 

                related = related.natural_key() 

            else: 

                if field.rel.field_name == related._meta.pk.name: 

                    # Related to remote object via primary key 

                    related = related._get_pk_val() 

                else: 

                    # Related to remote object via other field 

                    related = smart_text( 

                        getattr(related, field.rel.field_name), strings_only=True) 

        self._current[field.name] = related 

 

    def handle_m2m_field(self, obj, field): 

        if field.rel.through._meta.auto_created: 

            if self.use_natural_keys and hasattr(field.rel.model, 'natural_key'): 

                m2m_value = lambda value: value.natural_key() 

            else: 

                m2m_value = lambda value: smart_text( 

                    value._get_pk_val(), strings_only=True) 

            self._current[field.name] = [m2m_value(related) 

                                         for related in getattr(obj, field.name).iterator()] 

 

    #~ def getvalue(self): 

        #~ return self.objects 

 

SUPPORT_EMPTY_FIXTURES = False  # trying, but doesn't yet work 

 

if SUPPORT_EMPTY_FIXTURES: 

    from django_site.utils import AttrDict 

 

    class DummyDeserializedObject(base.DeserializedObject): 

 

        class FakeObject(object): 

            _meta = AttrDict(db_table='') 

        object = FakeObject() 

 

        def __init__(self): 

            pass 

 

        def save(self, *args, **kw): 

            pass 

 

 

class FakeDeserializedObject(base.DeserializedObject): 

    """Imitates DeserializedObject required by loaddata. 

 

    Unlike normal DeserializedObject, we *don't want* to bypass 

    pre_save and validation methods on the individual objects. 

 

    """ 

 

    def __init__(self, deserializer, object): 

        self.object = object 

        #~ self.name = name 

        self.deserializer = deserializer 

 

    def save(self, *args, **kw): 

        """ 

        """ 

        #~ print 'dpy.py',self.object 

        #~ logger.info("Loading %s...",self.name) 

 

        self.try_save(*args, **kw) 

        #~ if self.try_save(*args,**kw): 

            #~ self.deserializer.saved += 1 

        #~ else: 

            #~ self.deserializer.save_later.append(self) 

 

    def try_save(self, *args, **kw): 

        """Try to save the specified Model instance `obj`. Return `True` 

        on success, `False` if this instance wasn't saved and should be 

        deferred. 

        """ 

        obj = self.object 

        try: 

            """ 

            """ 

            m = getattr(obj, 'before_dumpy_save', None) 

            if m is not None: 

                m() 

            if not self.deserializer.quick: 

                try: 

                    obj.full_clean() 

                except ValidationError as e: 

                    raise  # Exception("{0} : {1}".format(obj2str(obj), e)) 

            obj.save(*args, **kw) 

            logger.debug("%s has been saved" % obj2str(obj)) 

            self.deserializer.register_success() 

            return True 

        #~ except ValidationError,e: 

        #~ except ObjectDoesNotExist,e: 

        #~ except (ValidationError,ObjectDoesNotExist), e: 

        #~ except (ValidationError,ObjectDoesNotExist,IntegrityError), e: 

        except Exception as e: 

            if True: 

                if not settings.SITE.loading_from_dump: 

                    # hand-written fixtures are expected to yield in savable 

                    # order 

                    logger.warning("Failed to save %s:" % obj2str(obj)) 

                    raise 

            deps = [f.rel.model for f in obj._meta.fields if f.rel is not None] 

            if not deps: 

                logger.exception(e) 

                raise Exception( 

                    "Failed to save independent %s." % obj2str(obj)) 

            self.deserializer.register_failure(self, e) 

            return False 

        #~ except Exception,e: 

            #~ logger.exception(e) 

            #~ raise Exception("Failed to save %s. Abandoned." % obj2str(obj)) 

 

 

class FlushDeferredObjects(object): 

 

    """ 

    Indicator class object. 

    Fixture may yield a `FlushDeferredObjects` 

    to indicate that all deferred objects should get saved before going on. 

    """ 

    pass 

 

 

class LoaderBase(object): 

 

    quick = False 

 

    def __init__(self): 

        #~ logger.info("20120225 DpyLoader.__init__()") 

        self.save_later = {} 

        self.reported_tracebacks = set() 

        self.saved = 0 

        self.count_objects = 0 

        self.AFTER_LOAD_HANDLERS = [] 

        # populated by Migrator.after_load(), but remains empty in a DpyDeserializer 

        self.before_load_handlers = [] 

 

    def flush_deferred_objects(self): 

        """ 

        Flush the list of deferred objects. 

        """ 

        while self.saved and self.save_later: 

            try_again = [] 

            for msg_objlist in list(self.save_later.values()): 

                for objlist in list(msg_objlist.values()): 

                    try_again += objlist 

            logger.info("Trying to save %d deferred objects.", 

                        len(try_again)) 

            self.save_later = {} 

            self.saved = 0 

            for obj in try_again: 

                obj.try_save()  # ,*args,**kw): 

            logger.info("Saved %d objects.", self.saved) 

 

    def expand(self, obj): 

        if obj is None: 

            pass  # ignore None values 

        elif obj is FlushDeferredObjects: 

            self.flush_deferred_objects() 

        elif isinstance(obj, models.Model): 

            yield FakeDeserializedObject(self, obj) 

        elif hasattr(obj, '__iter__'): 

        #~ if type(obj) is GeneratorType: 

            #~ logger.info("20120225 expand iterable %r",obj) 

            for o in obj: 

                for so in self.expand(o): 

                    yield so 

        #~ elif isinstance(obj,MtiChildWrapper): 

            # the return value of create_mti_child() 

            #~ yield FakeDeserializedObject(self,obj) 

            #~ obj.deserializer = self 

            #~ yield obj 

        else: 

            logger.warning("Ignored unknown object %r", obj) 

 

    def register_success(self): 

        self.saved += 1 

        self.count_objects += 1 

 

    def register_failure(self, obj, e): 

        msg = force_text(e) 

        d = self.save_later.setdefault(obj.object.__class__, {}) 

        l = d.setdefault(msg, []) 

        if len(l) == 0: 

            logger.info("Deferred %s : %s", obj2str(obj.object), msg) 

        l.append(obj) 

        # report a full traceback, but only once per model and 

        # exception type: 

        k = (obj.object.__class__, e.__class__) 

        if k not in self.reported_tracebacks: 

            logger.exception(e) 

            self.reported_tracebacks.add(k) 

 

    def initialize(self): 

        """To be called after initdb and before starting to load the dumped 

data.""" 

        for h in self.before_load_handlers: 

            logger.info("Running before_load handler %s", h.__doc__) 

            h(self) 

 

    def finalize(self): 

        """ 

        """ 

        self.flush_deferred_objects() 

 

        if len(self.AFTER_LOAD_HANDLERS): 

            logger.info( 

                "Finalize %d after_load handlers", 

                len(self.AFTER_LOAD_HANDLERS)) 

 

        for h in self.AFTER_LOAD_HANDLERS: 

            logger.info("Running after_load handler %s", h.__doc__) 

            h(self) 

 

        logger.info("Loaded %d objects", self.count_objects) 

 

        if self.save_later: 

            count = 0 

            s = '' 

            for model, msg_objects in list(self.save_later.items()): 

                for msg, objects in list(msg_objects.items()): 

                    if False:  # detailed content of the first object 

                        s += "\n- %s %s (%d object(s), e.g. %s)" % ( 

                            full_model_name(model), msg, len(objects), 

                            obj2str(objects[0].object, force_detailed=True)) 

                    else:  # pk of all objects 

                        s += "\n- %s %s (%d object(s) with primary key %s)" % ( 

                            full_model_name(model), msg, len(objects), 

                            ', '.join([str(o.object.pk) for o in objects])) 

                    count += len(objects) 

 

            msg = "Abandoning with %d unsaved instances:%s" % (count, s) 

            logger.warning(msg) 

 

            # Don't raise an exception. The unsaved instances got lost and 

            # the loaddata should be done again, but meanwhile the database 

            # is not necessarily invalid and may be used for further testing. 

            # And anyway, loaddata would catch it and still continue. 

            # raise Exception(msg) 

 

 

class DpyLoader(LoaderBase): 

    """Instantiated by `restore.py`. 

 

    """ 

    def __init__(self, globals_dict): 

        self.globals_dict = globals_dict 

        super(DpyLoader, self).__init__() 

        site = globals_dict['settings'].SITE 

        site.startup() 

        site.install_migrations(self) 

 

    def save(self, obj): 

        for o in self.expand(obj): 

            o.try_save() 

 

 

class DpyDeserializer(LoaderBase): 

    """The Django deserializer for :ref:`dpy`. 

 

    """ 

 

    def deserialize(self, fp, **options): 

        #~ logger.info("20120225 DpyLoader.deserialize()") 

        if isinstance(fp, basestring): 

            raise NotImplementedError 

 

        translation.activate(settings.SITE.get_default_language()) 

 

        #~ self.count += 1 

        fqname = 'lino.dpy_tmp_%s' % hash(self) 

 

        if False: 

            parts = fp.name.split(os.sep) 

            #~ parts = os.path.split(fp.name) 

            print(parts) 

            #~ fqname = parts[-1] 

            fqname = '.'.join([p for p in parts if not ':' in p]) 

            assert fqname.endswith(SUFFIX) 

            fqname = fqname[:-len(SUFFIX)] 

            print(fqname) 

        desc = (SUFFIX, 'r', imp.PY_SOURCE) 

        logger.info("Loading %s...", fp.name) 

 

        module = imp.load_module(fqname, fp, fp.name, desc) 

        #~ module = __import__(filename) 

 

        for o in self.deserialize_module(module, **options): 

            yield o 

 

    def deserialize_module(self, module, **options): 

 

        self.initialize() 

 

        empty_fixture = True 

        objects = getattr(module, 'objects', None) 

        if objects is None: 

            logger.info("Fixture %s has no attribute 'objects'" % 

                        module.__name__) 

        else: 

 

            for obj in objects(): 

                for o in self.expand(obj): 

                    empty_fixture = False 

                    yield o 

 

        # Since Django 1.7 no longer considers empty fixtures as an 

        # error, we don't need to use our trick of yielding the 

        # SiteConfig instance. That trick sometimes could cause side 

        # effects. 

        if empty_fixture and not AFTER17: 

            if SUPPORT_EMPTY_FIXTURES: 

                # avoid Django interpreting empty fixtures as an error 

                yield DummyDeserializedObject() 

            else: 

                # To avoid Django interpreting empty fixtures as an 

                # error, we yield one object which always exists: the 

                # SiteConfig instance. 

 

                # Oops, that will fail in lino_welfare if the company 

                # pointed to by SiteConfig.job_office had been 

                # deferred. 

                if settings.SITE.site_config: 

                    yield FakeDeserializedObject( 

                        self, settings.SITE.site_config) 

                else: 

                    raise Exception("""\ 

Fixture %s decided to not create any object. 

We're sorry, but Django doesn't like that. 

See <https://code.djangoproject.com/ticket/18213>. 

""" % module.__name__) 

 

        #~ logger.info("Saved %d instances from %s.",self.saved,fp.name) 

 

        self.finalize() 

 

 

def Deserializer(fp, **options): 

    """The Deserializer used when ``manage.py loaddata`` encounters a 

    `.py` fixture. 

 

    """ 

    d = DpyDeserializer() 

    return d.deserialize(fp, **options) 

 

 

class Migrator(object): 

    """The SITE's Migrator class is instantiated by `install_migrations`. 

 

    If :setting:`migration_class` is None (the default), then this 

    class will be instantiated. Applications may define their own 

    Migrator class which should be a subclasss of this. 

 

    """ 

    def __init__(self, site, loader): 

        self.site = site 

        self.loader = loader 

 

    def after_load(self, todo): 

        """Declare a function to be called after all data has been loaded.""" 

        assert callable(todo) 

        # al = self.globals_dict['AFTER_LOAD_HANDLERS'] 

        self.loader.AFTER_LOAD_HANDLERS.append(todo) 

 

    def before_load(self, todo): 

        """Declare a function to be called before loading dumped data.""" 

        assert callable(todo) 

        self.loader.before_load_handlers.append(todo) 

 

 

def install_migrations(self, loader): 

    """Python dumps are generated with one line near the end of their 

    `restore.py` file which calls this method, passing it their global 

    namespace:: 

 

      settings.SITE.install_migrations(globals()) 

 

    A dumped fixture should always call this, even if there is no 

    version change and no data migration, because this also does 

    certain other things: 

 

    - set :setting:`loading_from_dump` to `True` 

    - remove any Permission and Site objects that might have been 

      generated by `post_syncdb` signal if these apps are installed. 

 

    """ 

    globals_dict = loader.globals_dict 

 

    self.loading_from_dump = True 

 

    if self.is_installed('auth'): 

        from django.contrib.auth.models import Permission 

        Permission.objects.all().delete() 

    if self.is_installed('sites'): 

        from django.contrib.sites.models import Site 

        Site.objects.all().delete() 

 

    current_version = self.version 

 

    if current_version is None: 

        logger.info("Unversioned Site instance : no database migration") 

        return 

 

    if globals_dict['SOURCE_VERSION'] == current_version: 

        logger.info("Source version is %s : no migration needed", 

                    current_version) 

        return 

 

    if self.migration_class is not None: 

        mc = import_string(self.migration_class) 

        migrator = mc(self, loader) 

    else: 

        migrator = self 

 

    while True: 

        from_version = globals_dict['SOURCE_VERSION'] 

        funcname = 'migrate_from_' + from_version.replace('.', '_') 

 

        m = getattr(migrator, funcname, None) 

 

        if m is not None: 

            #~ logger.info("Found %s()", funcname) 

            to_version = m(globals_dict) 

            if not isinstance(to_version, basestring): 

                raise Exception("Oops, %s didn't return a string!" % m) 

            if to_version <= from_version: 

                raise Exception( 

                    "Oops, %s tries to migrate from version %s to %s ?!" % 

                    (m, from_version, to_version)) 

            msg = "Migrating from version %s to %s" % ( 

                from_version, to_version) 

            if m.__doc__: 

                msg += ":\n" + m.__doc__ 

            logger.info(msg) 

            globals_dict['SOURCE_VERSION'] = to_version 

        else: 

            if from_version != current_version: 

                logger.warning( 

                    "No method for migrating from version %s to %s", 

                    from_version, current_version) 

            break 

 

 

def load_fixture_from_module(m, **options): 

    """ 

    Used in unit tests to manually load a given fixture module. 

    E.g. in Lino `/tutorials/tables/index`. 

    """ 

    #~ filename = m.__file__[:-1] 

    #~ print filename 

    #~ assert filename.endswith('.py') 

    #~ fp = open(filename) 

    d = DpyDeserializer() 

    for o in d.deserialize_module(m, **options): 

        o.save() 

 

    # 20140506 Don't remember why the following was. But it disturbed 

    # in Lino `/tutorials/tables/index`. 

 

    # if d.saved != 1: 

    #     logger.info("20140506 Loaded %d objects", d.saved) 

    #     raise Exception("Failed to load Python fixture from module %s" % 

    #                     m.__name__) 

    # return d