AaronPo/the-biergarten-app
1
0
Fork 0
mirror of https://github.com/aaronpo97/the-biergarten-app.git synced 2026-10-15 01:54:43 +00:00
Code Issues Packages Projects Releases Wiki Activity

Compute nearby-brewery distance in SQL instead of client-side Haversine, and add the spatial index it relies on.

Browse Source
This commit is contained in:
Aaron Po
2026-08-27 02:40:58 -04:00
parent dab7aa2458
commit 7330eabebe
10 changed files with 244 additions and 121 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
web/backend/Features/Features.Breweries/Repository/BreweryRepository.cs
View File

@@ -134,6 +134,7 @@ public class BreweryRepository(ISqlConnectionFactory connectionFactory)
City,
StateProvince,
Country,
DistanceRow,
BreweryPost
> (
"""
@@ -154,7 +155,8 @@ public class BreweryRepository(ISqlConnectionFactory connectionFactory)
sp.ISO3166_2 AS Iso31662,
co.CountryID,
co.CountryName,
co.ISO3166_1 AS Iso31661
co.ISO3166_1 AS Iso31661,
bpl.Coordinates.STDistance(@Origin) AS DistanceMetres
FROM dbo.BreweryPost bp
INNER JOIN dbo.BreweryPostLocation bpl ON bp.BreweryPostID = bpl.BreweryPostID
LEFT JOIN dbo.City c ON bpl.CityID = c.CityID
@@ -164,14 +166,15 @@ public class BreweryRepository(ISqlConnectionFactory connectionFactory)
AND bpl.Coordinates.STDistance(@Origin) <= @RangeInMetres
ORDER BY bpl.Coordinates.STDistance(@Origin) ASC
""",
MapBreweryRow,
(post, location, city, stateProvince, country, distance) =>
MapBreweryRowWithDistance(post, location, city, stateProvince, country, distance, coords),
param: new
{
coords.Latitude,
coords.Longitude,
RangeInMetres = rangeInMetres
},
splitOn: "BreweryPostLocationID,CityID,StateProvinceID,CountryID"
splitOn: "BreweryPostLocationID,CityID,StateProvinceID,CountryID,DistanceMetres"
);
}
@@ -583,4 +586,29 @@ public class BreweryRepository(ISqlConnectionFactory connectionFactory)
post.Location = location;
return post;
}
/// <summary>Dapper multi-mapping row for the <c>DistanceMetres</c> column computed by a range query.</summary>
private sealed class DistanceRow
{
public double DistanceMetres { get; set; }
}
/// <summary>
/// Composes a joined row via <see cref="MapBreweryRow" />, then attaches the DB-computed distance
/// from <paramref name="origin" /> as the result's <see cref="BreweryPost.Distance" />.
/// </summary>
private static BreweryPost MapBreweryRowWithDistance(
BreweryPost post,
BreweryPostLocation location,
City city,
StateProvince stateProvince,
Country country,
DistanceRow distance,
CoordinateData origin
)
{
BreweryPost mapped = MapBreweryRow(post, location, city, stateProvince, country);
mapped.Distance = new DistanceInformation(origin, distance.DistanceMetres);
return mapped;
}
}