Google DataStore - createdAt attribute and updates
It's often very useful to know when an entry / document has been created. But since it's not possible to update only a specific set of attributes in Google DataStore, it's hard to keep the value of createdAt over the life of the object.
Essentially it seems like in order to have a createdAt attribute with DataStore, the application must [get] the entry in order to retrieve the createdAt value, and then [update] it reusing that value. Of course this means more $$$ since every update will make 2 API requests instead of 1.
Is there something I am missing or is that the best way to go about this?
google-cloud-datastore asked Nov 22 at 23:59
ben
3022418
add a comment |
It's often very useful to know when an entry / document has been created. But since it's not possible to update only a specific set of attributes in Google DataStore, it's hard to keep the value of createdAt over the life of the object.
Essentially it seems like in order to have a createdAt attribute with DataStore, the application must [get] the entry in order to retrieve the createdAt value, and then [update] it reusing that value. Of course this means more $$$ since every update will make 2 API requests instead of 1.
Is there something I am missing or is that the best way to go about this?
google-cloud-datastore asked Nov 22 at 23:59
ben
3022418
an entry / document has been created- do you mean a datastore entity?
– Dan Cornilescu
Nov 23 at 3:13
add a comment |
It's often very useful to know when an entry / document has been created. But since it's not possible to update only a specific set of attributes in Google DataStore, it's hard to keep the value of createdAt over the life of the object.
Essentially it seems like in order to have a createdAt attribute with DataStore, the application must [get] the entry in order to retrieve the createdAt value, and then [update] it reusing that value. Of course this means more $$$ since every update will make 2 API requests instead of 1.
Is there something I am missing or is that the best way to go about this?
google-cloud-datastore asked Nov 22 at 23:59
ben
3022418
It's often very useful to know when an entry / document has been created. But since it's not possible to update only a specific set of attributes in Google DataStore, it's hard to keep the value of createdAt over the life of the object.
Essentially it seems like in order to have a createdAt attribute with DataStore, the application must [get] the entry in order to retrieve the createdAt value, and then [update] it reusing that value. Of course this means more $$$ since every update will make 2 API requests instead of 1.
Is there something I am missing or is that the best way to go about this?
google-cloud-datastore google-cloud-datastore asked Nov 22 at 23:59
ben
3022418
asked Nov 22 at 23:59
ben
3022418
asked Nov 22 at 23:59
ben
3022418
asked Nov 22 at 23:59
ben
3022418
asked Nov 22 at 23:59
ben
3022418
3022418
an entry / document has been created- do you mean a datastore entity?
– Dan Cornilescu
Nov 23 at 3:13
add a comment |
an entry / document has been created- do you mean a datastore entity?
– Dan Cornilescu
Nov 23 at 3:13
an entry / document has been created - do you mean a datastore entity?– Dan Cornilescu
Nov 23 at 3:13
an entry / document has been created - do you mean a datastore entity?– Dan Cornilescu
Nov 23 at 3:13
add a comment |
1 Answer
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Support for such functionality depends on the client library you use.
For example the ndb client library recommended for the 1st generation App Engine applications offers such support. From Date and Time Properties:
Each of these properties has two extra Boolean keyword options:
auto_now_add
Set property to current date/time when entity is created. You can
manually override this property. When the entity is updated, the
property doesn't change. For that behavior, use auto_now.
auto_now
Set property to current date/time when entity is created and whenever
it is updated.
So when you put the entity into the datastore without providing values for such properties (and they have these options set) they are automatically updated.
answered Nov 23 at 3:35
Dan Cornilescu
27.6k113161
is this the only client lib that offer such support? In particular, does nodejs have an equivalent lib?
– ben
Nov 26 at 8:04
add a comment |
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1 Answer
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1 Answer
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oldest
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oldest
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oldest
votes
Support for such functionality depends on the client library you use.
For example the ndb client library recommended for the 1st generation App Engine applications offers such support. From Date and Time Properties:
Each of these properties has two extra Boolean keyword options:
auto_now_add
Set property to current date/time when entity is created. You can
manually override this property. When the entity is updated, the
property doesn't change. For that behavior, use auto_now.
auto_now
Set property to current date/time when entity is created and whenever
it is updated.
So when you put the entity into the datastore without providing values for such properties (and they have these options set) they are automatically updated.
answered Nov 23 at 3:35
Dan Cornilescu
27.6k113161
is this the only client lib that offer such support? In particular, does nodejs have an equivalent lib?
– ben
Nov 26 at 8:04
add a comment |
Support for such functionality depends on the client library you use.
For example the ndb client library recommended for the 1st generation App Engine applications offers such support. From Date and Time Properties:
Each of these properties has two extra Boolean keyword options:
auto_now_add
Set property to current date/time when entity is created. You can
manually override this property. When the entity is updated, the
property doesn't change. For that behavior, use auto_now.
auto_now
Set property to current date/time when entity is created and whenever
it is updated.
So when you put the entity into the datastore without providing values for such properties (and they have these options set) they are automatically updated.
answered Nov 23 at 3:35
Dan Cornilescu
27.6k113161
is this the only client lib that offer such support? In particular, does nodejs have an equivalent lib?
– ben
Nov 26 at 8:04
add a comment |
Support for such functionality depends on the client library you use.
For example the ndb client library recommended for the 1st generation App Engine applications offers such support. From Date and Time Properties:
Each of these properties has two extra Boolean keyword options:
auto_now_add
Set property to current date/time when entity is created. You can
manually override this property. When the entity is updated, the
property doesn't change. For that behavior, use auto_now.
auto_now
Set property to current date/time when entity is created and whenever
it is updated.
So when you put the entity into the datastore without providing values for such properties (and they have these options set) they are automatically updated.
answered Nov 23 at 3:35
Dan Cornilescu
27.6k113161
Support for such functionality depends on the client library you use.
For example the ndb client library recommended for the 1st generation App Engine applications offers such support. From Date and Time Properties:
Each of these properties has two extra Boolean keyword options:
auto_now_add
Set property to current date/time when entity is created. You can
manually override this property. When the entity is updated, the
property doesn't change. For that behavior, use auto_now.
auto_now
Set property to current date/time when entity is created and whenever
it is updated.
So when you put the entity into the datastore without providing values for such properties (and they have these options set) they are automatically updated.
answered Nov 23 at 3:35
Dan Cornilescu
27.6k113161
answered Nov 23 at 3:35
Dan Cornilescu
27.6k113161
answered Nov 23 at 3:35
Dan Cornilescu
27.6k113161
answered Nov 23 at 3:35
Dan Cornilescu
27.6k113161
27.6k113161
is this the only client lib that offer such support? In particular, does nodejs have an equivalent lib?
– ben
Nov 26 at 8:04
add a comment |
is this the only client lib that offer such support? In particular, does nodejs have an equivalent lib?
– ben
Nov 26 at 8:04
is this the only client lib that offer such support? In particular, does nodejs have an equivalent lib?
– ben
Nov 26 at 8:04
is this the only client lib that offer such support? In particular, does nodejs have an equivalent lib?
– ben
Nov 26 at 8:04
add a comment |
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an entry / document has been created- do you mean a datastore entity?– Dan Cornilescu
Nov 23 at 3:13