def __repr__(self):
from model.functions import get_name
rel_type = type(self).name
owner = get_name(self.owner.model)
field = self.owner.field_name
inverse_field = self.inverse.field_name
inverse = get_name(self.inverse.model)
if self.inverse_relation:
return "<bidirectional {} between {}.{} and {}.{}>".format(rel_type, owner, field, inverse, inverse_field)
else:
return "<unidirectional {} between {}.{} and {}.{}>".format(rel_type, owner, field, inverse, inverse_field)
def load(self, module):
"""Load a specific module.
This method:
Get the Model class defined in the module
Try to find the corresponding repository
Write this dclass in the model's bundle
Return the class
"""
name = Rule.module_name(module)
bundle_name = Rule.bundle_name(module)
bundle = self.server.bundles[bundle_name]
class_name = name.capitalize()
mod_class = getattr(module, class_name)
mod_class.bundle = bundle
mod_name = get_name(mod_class)
# Try to find the corresponding repository
if mod_name in bundle.repositories:
rep_class = bundle.repositories[mod_name]
print("Found the repository", rep_class)
else:
rep_class = Repository
print("Create a new repository")
repository = rep_class(self.data_connector, mod_class)
mod_class._repository = repository
# Write the class in the bundles
bundle.models[mod_name] = mod_class
# Record the new bundle in the data connector
self.data_connector.repository_manager.record_model(mod_class)
return mod_class
def find_relation(self):
"""Find and return the relation.
First we select the type of this field. Next we try to find an
inverse relation field in the foreign model. With them, we can
create one or two relations (bidirectional relations are two
relations bound together). For instance, if the 'self' field
type is a 'has_one' and the foreign model has a 'has_many'
pointing to the original model, then we create a
'One2ManyRelation' between 'self' and the foreign model and an
inverse relation ('Many2OneRelation') between the foreign model
and 'self'.
"""
from model.functions import get_fields, get_name
nb_self = self.nb_foreign_models
if isinstance(self.foreign_model, str):
self.foreign_model = self.model._repository.get_model(
self.foreign_model)
# Now we try to find the inverse field
foreign_fields = get_fields(self.foreign_model, register=False)
foreign_fields = [field for field in foreign_fields if \
field is not self]
foreign_field = None
for field in foreign_fields:
if isinstance(field, Related) and (get_name(
self.model) == field.foreign_model or isinstance(
field.foreign_model, type(self.model))):
foreign_field = field
foreign_field.foreign_model = self.model
break
if foreign_field is None:
raise ValueError("the foreign field for the {}.{} field " \
"cannot be found in {}".format(self.model,
self.field_name, self.foreign_model))
nb_foreign = foreign_field.nb_foreign_models
cls_relation = None
cls_inverse_relation = None
if nb_self == 0:
return None
elif nb_self == -1:
if nb_foreign == 1:
cls_relation = Many2OneRelation
cls_inverse_relation = One2ManyRelation
elif nb_foreign == -1:
# many2many
pass
else:
cls_relation = Many2OneRelation
else:
if nb_foreign == 1:
# one2one
pass
elif nb_foreign == -1:
cls_relation = One2ManyRelation
cls_inverse_relation = Many2OneRelation
else:
# one2one
pass
relation = cls_relation(self, foreign_field)
if cls_inverse_relation:
inverse_relation = cls_inverse_relation(foreign_field, self)
inverse_relation.inverse_relation = relation
relation.inverse_relation = inverse_relation
return relation
