Mercurial > gemma
view pkg/controllers/surveys.go @ 5095:e21cbb9768a2
Prevent duplicate fairway areas
In principal, there can be only one or no fairway area at each point
on the map. Since polygons from real data will often be topologically
inexact, just disallow equal geometries. This will also help to
avoid importing duplicates with concurrent imports, once the history
of fairway dimensions will be preserved.
author | Tom Gottfried <tom@intevation.de> |
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date | Wed, 25 Mar 2020 18:10:02 +0100 |
parents | e68220372832 |
children | 5e7fca6ef935 |
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// This is Free Software under GNU Affero General Public License v >= 3.0 // without warranty, see README.md and license for details. // // SPDX-License-Identifier: AGPL-3.0-or-later // License-Filename: LICENSES/AGPL-3.0.txt // // Copyright (C) 2018, 2019 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Sascha Wilde <sascha.wilde@intevation.de> // * Sascha L. Teichmann <sascha.teichmann@intevation.de> // * Bernhard Reiter <bernhard.reiter@intevation.de> package controllers import ( "database/sql" "net/http" "github.com/gorilla/mux" "gemma.intevation.de/gemma/pkg/models" mw "gemma.intevation.de/gemma/pkg/middleware" ) const ( listSurveysSQL = ` SELECT DISTINCT s.bottleneck_id, s.date_info::text, s.depth_reference, COALESCE(g.objname, 'ERROR: MISSING GAUGE') AS gauge_objname, r.value AS waterlevel_value FROM waterway.bottlenecks AS b JOIN waterway.sounding_results AS s ON b.bottleneck_id = s.bottleneck_id LEFT JOIN waterway.gauges AS g ON b.gauge_location = g.location AND s.date_info::timestamptz <@ g.validity LEFT JOIN waterway.gauges_reference_water_levels AS r ON s.depth_reference = r.depth_reference AND g.location = r.location AND g.validity = r.validity WHERE b.objnam = $1` ) func listSurveys(req *http.Request) (jr mw.JSONResult, err error) { bottleneckName := mux.Vars(req)["bottleneck"] var rows *sql.Rows rows, err = mw.JSONConn(req).QueryContext(req.Context(), listSurveysSQL, bottleneckName) if err != nil { return } defer rows.Close() surveys := []*models.Survey{} // as we do not use the values here, we could simply the code here // to work without an explicit mdels/surverys.go // (like done in controllers/search.go) for rows.Next() { var survey models.Survey var level sql.NullInt64 if err = rows.Scan( &survey.BottleneckID, &survey.DateInfo, &survey.DepthReference, &survey.ReferenceGauge, &level, ); err != nil { return } if level.Valid { survey.WaterLevelValue = &level.Int64 } surveys = append(surveys, &survey) } if err = rows.Err(); err != nil { return } jr = mw.JSONResult{ Result: struct { Surveys []*models.Survey `json:"surveys"` }{surveys}, } return }