How to create associations - grpc

Say I have a GRPC order that looks like this when generated:
Google::Protobuf::DescriptorPool.generated_pool.build do
add_message "something.Order" do
optional :uuid, :string, 1
repeated :shipments, :message, 2, "something.Shipment"
...
end
end
So an Order has many shipments. When I create the order to send back as a response in the service... how do I create the many shipments?
Can I just do:
order = Order.find(request.id)
Something::Order.new(uuid: order.id, shipments: [order.shipments)
Or does it needs to be:
order = Order.find(request.id)
Something::Order.new(uuid: order.id, shipments: [order.shipments.attributes)
I get the latter from these docs

I'm not sure but it looks like the google-protobuf package is used here?
(https://github.com/google/protobuf).
If that's the case, I don't think the ruby-protobuf docs are relevant here.
For using Google::Protobuf here, it looks like you should be able to add an array of Shipment objects to the 'shipments' field of an 'Order' instance.

Related

Create a perl hash from a db select

Having some trouble understanding how to create a Perl hash from a DB select statement.
$sth=$dbh->prepare(qq{select authorid,titleid,title,pubyear from books});
$sth->execute() or die DBI->errstr;
while(#records=$sth->fetchrow_array()) {
%Books = (%Books,AuthorID=> $records[0]);
%Books = (%Books,TitleID=> $records[1]);
%Books = (%Books,Title=> $records[2]);
%Books = (%Books,PubYear=> $records[3]);
print qq{$records[0]\n}
print qq{\t$records[1]\n};
print qq{\t$records[2]\n};
print qq{\t$records[3]\n};
}
$sth->finish();
while(($key,$value) = each(%Books)) {
print qq{$key --> $value\n};
}
The print statements work in the first while loop, but I only get the last result in the second key,value loop.
What am I doing wrong here. I'm sure it's something simple. Many thanks.
OP needs better specify the question and do some reading on DBI module.
DBI module has a call for fetchall_hashref perhaps OP could put it to some use.
In the shown code an assignment of a record to a hash with the same keys overwrites the previous one, row after row, and the last one remains. Instead, they should be accumulated in a suitable data structure.
Since there are a fair number of rows (351 we are told) one option is a top-level array, with hashrefs for each book
my #all_books;
while (my #records = $sth->fetchrow_array()) {
my %book;
#book{qw(AuthorID TitleID Title PubYear)} = #records;
push #all_books, \%book;
}
Now we have an array of books, each indexed by the four parameters.
This uses a hash slice to assign multiple key-value pairs to a hash.
Another option is a top-level hash with keys for the four book-related parameters, each having for a value an arrayref with entries from all records
my %books;
while (my #records = $sth->fetchrow_array()) {
push #{$books{AuthorID}}, $records[0];
push #{$books{TitleID}}, $records[1];
...
}
Now one can go through authors/titles/etc, and readily recover the other parameters for each.
Adding some checks is always a good idea when reading from a database.

How do I access a calculated field in Rails?

In my first attempt to develop something in Ruby on Rails :) ... I have a list of names stored in fields "first_name" and "last_name". In my Person model, I have defined something like this:
def sort_name
sort_name = last_name + ',' + first_name
end
Now I want to show all persons shown in a list, sorted by sort_name, but (in my controller) something like
#persons = Person.order(:sort_name)
doesn't work (Unknown column 'sort_name' in 'order clause'). How do reference to the calculated field sort_name in my controller?
I am sure this is a "oh my god I am so stupid moment" but happy for any advise!
If the model Person has the fields name, first_lastname and second_lastname, you can do the next:
Person.order(:name, :first_lastname, :second_lastname)
By default is ordering in ascending way. Also you can put if you want ascending or descending way for each field:
Person.order(name: :asc, first_lastname: :desc, second_lastname: :asc)
Additional if you want add a column with the complete name, you can use select, using postgresql the code would be:
people = Person.order(
name: :asc, first_lastname: :desc, second_lastname: :asc
).select(
"*, concat(name,' ', first_lastname, ' ',second_lastname) as sort_name"
)
people[0].sort_name
# the sort_name can be for example "Adán Saucedo Salas"

Correct parameter binding for SELECT WHERE .. LIKE using fmdb?

First time user of fmdb here, trying to start off doing things correctly. I have a simple single table that I wish to perform a SELECT WHERE .. LIKE query on and after trying several of the documented approaches, I can't get any to yield the correct results.
e.g.
// 'filter' is an NSString * containing a fragment of
// text that we want in the 'track' column
NSDictionary *params =
[NSDictionary dictionaryWithObjectsAndKeys:filter, #"filter", nil];
FMResultSet *results =
[db executeQuery:#"SELECT * FROM items WHERE track LIKE '%:filter%' ORDER BY linkNum;"
withParameterDictionary:params];
Or
results = [db executeQuery:#"SELECT * FROM items WHERE track LIKE '%?%' ORDER BY linkNum;", filter];
Or
results = [db executeQuery:#"SELECT * FROM items WHERE track LIKE '%?%' ORDER BY linkNum;" withArgumentsInArray:#[filter]];
I've stepped through and all methods converge in the fmdb method:
- (FMResultSet *)executeQuery:(NSString *)sql withArgumentsInArray:(NSArray*)arrayArgs orDictionary:(NSDictionary *)dictionaryArgs orVAList:(va_list)args
Depending on the approach, and therefore which params are nil, it then either calls sqlite3_bind_parameter_count(pStmt), which always returns zero, or, for the dictionary case, calls sqlite3_bind_parameter_index(..), which also returns zero, so the parameter doesn't get slotted into the LIKE and then the resultSet from the query is wrong.
I know that this is absolutely the wrong way to do it (SQL injection), but it's the only way I've managed to have my LIKE honoured:
NSString *queryString = [NSString stringWithFormat:#"SELECT * FROM items WHERE track LIKE '%%%#%%' ORDER BY linkNum;", filter];
results = [db executeQuery:queryString];
(I've also tried all permutations but with escaped double-quotes in place of the single quotes shown here)
Update:
I've also tried fmdb's own …WithFormat variant, which should provide convenience and protection from injection:
[db executeQueryWithFormat:#"SELECT * FROM items WHERE track LIKE '%%%#%%' ORDER BY linkNum;", filter];
Again, stepping into the debugger I can see that the LIKE gets transformed from this:
… LIKE '%%%#%%' ORDER BY linkNum;
To this:
… LIKE '%%?%' ORDER BY linkNum;
… which also goes on to return zero from sqlite3_bind_parameter_count(), where I would expect a positive value equal to "the index of the largest (rightmost) parameter." (from the sqlite docs)
The error was to include any quotes at all:
[db executeQuery:#"SELECT * FROM items WHERE track LIKE ? ORDER BY linkNum;", filter];
… and the % is now in the filter variable, rather than in the query.

How to parameterize a link object/element in QTP?

Please give me a hint how to parameterize a link element in QTP...As we can parameterize 'WebEdit' element/object ,can we parameterize 'Link' element/object and how can we?
By parameterizing, do you mean Parameterizing the properties of the Link element to identify it using Descriptive Programming? Or is it something else?? Please elaborate!!
You can build a function like the one below for each object type that you want to use.
public Function CreateLinkDescription(LinkInnerTextValue, LinkHrefValue)
Set objLink = Description.Create()
objLink("innertext").Value = LinkInnerTextValue
objLink("href").Value = LinkHrefValue
'Add any other properties that you want to specify in the same fashion as above
Set CreateLinkDescription = objLink
End Function

CouchDB View with 2 Keys

I am looking for a general solution to a problem with couchdb views.
For example, have a view result like this:
{"total_rows":4,"offset":0,"rows":[
{"id":"1","key":["imported","1"],"value":null},
{"id":"2","key":["imported","2"],"value":null},
{"id":"3","key":["imported","3"],"value":null},
{"id":"4","key":["mapped","4"],"value":null},
{"id":"5,"key":["mapped","5"],"value":null}
]
1) If I want to select only "imported" documents I would use this:
view?startkey=["imported"]&endkey=["imported",{}]
2) If I want to select all imported documents with an higher id then 2:
view?startkey=["imported",2]&endkey=["imported",{}]
3) If I want to select all imported documents with an id between 2 and 4:
view?startkey=["imported",2]&endkey=["imported",4]
My Questtion is: How can I select all Rows with an id between 2 and 4?
You can try to extend the solution above, but prepend keys with a kind of "emit index" flag like this:
map: function (doc) {
emit ([0, doc.number, doc.category]); // direct order
emit ([1, doc.category, doc.number]); // reverse order
}
so you will be able to request them with
view?startkey=[0, 2]&endkey=[0, 4, {}]
or
view?startkey=[1, 'imported', 2]&endkey=[1, 'imported', 4]
But 2 different views will be better anyway.
I ran into the same problem a little while ago so I'll explain my solution. Inside of any map function you can have multiple emit() calls. A map function in your case might look like:
function(doc) {
emit([doc.number, doc.category], null);
emit([doc.category, doc.number], null);
}
You can also use ?include_docs=true to get the documents back from any of your queries. Then your query to get back rows 2 to 4 would be
view?startkey=[2]&endkey=[4,{}]
You can view the rules for sorting at CouchDB View Collation

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