jq - sorting value by a related value - json

Question

Basically I'm just trying to make a list of NCAA March Madness teams sorted by their respective seeds.
I'm using the JSON file from http://data.ncaa.com/jsonp/scoreboard/basketball-men/d1/2017/03/17/scoreboard.html. It's actually JSONP, but I convert it to JSON before parsing through it using:
jq -s -R '.[1+index("("): rindex(")")] | fromjson'
Piping that into the following command I can generate a nice list of the teams:
jq -r '.scoreboard[].games[] | select(.bracketRound=="First Round" and .bracketRegion=="EAST") | .home,.away | .nameRaw'
...but I want them to be in order of their seed. I've tried using sort and sort_by in various ways to no avail. I'm out of ideas.

Answer 1

Given your data, the following filter:
[ .scoreboard[].games[]
| select(.bracketRound=="First Round" and .bracketRegion=="EAST")
| (.home, .away) ]
| sort_by(.teamSeed | tonumber)
| .[]
| [.teamSeed, .nameRaw ]
produces:
["2","Duke"]
["3","Baylor"]
["6","SMU"]
["7","South Carolina"]
["10","Marquette"]
["11","USC"]
["14","New Mexico St."]
["15","Troy"]
If you just want the "nameRaw" values, then replace the last line of the filter by: | .nameRaw
Note that tonumber is required here as the seed values are given as strings.
Handling multiple top-level objects
In a comment, the OP gave a pastebin (https://pastebin.com/1eTAX4y3) consisting of two top-level objects each with a "scoreboard". Let us therefore consider the case of an arbitrary number of such objects.
For clarity, we begin by defining a function for selecting the home/away objects from a JSON object with "scoreboard":
def games:
[.scoreboard[].games[]
| select(.bracketRound=="First Round" and .bracketRegion=="EAST")
| (.home, .away) ] ;
Using the -s command-line option, we can ensure the JSON input is an array of objects. The arrays produced by games can be combined using add:
map(games)
| add
| sort_by(.teamSeed | tonumber)
| .[]
| [.teamSeed, .nameRaw ]
Given the pastebin data, the invocation using the command-line options -s and -c options produces:
["1","Villanova"]
["2","Duke"]
["3","Baylor"]
["4","Florida"]
["5","Virginia"]
["6","SMU"]
["7","South Carolina"]
["8","Wisconsin"]
["9","Virginia Tech"]
["10","Marquette"]
["11","USC"]
["12","UNCW"]
["13","East Tenn. St."]
["14","New Mexico St."]
["15","Troy"]
["16","Mt. St. Mary's"]

Answer 2

Does this do what you want?
jq -r '
def NameAndSeed(f): f | {nameRaw, "teamSeed" : (.teamSeed | tonumber)};
[
.scoreboard[].games[]
| select(.bracketRound=="First Round" and .bracketRegion=="EAST")
| NameAndSeed(.home), NameAndSeed(.away)
]
| sort_by(.teamSeed)
| .[].nameRaw'
To get sort_by to do what I think you want, I put the objects in an array and converted the teamSeed values to numbers.