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[FEATURE] Add N:M relation editing possibilities
This adds the possibility to manage data on a normalized relational database in N:M relations. On the relation editor in a form, the tools to add, delete, link and unlink work (also) on the linking table if a relation is visualized as N:M relation. Configuration is done through the fields tab where on the relation a second relation can be chosen (if there is a suitable relation in terms of a second relation on the linking table). Limitations =========== QGIS is not a database management system. It is based on assumptions about the underlying database system. In particular it expects * A `ON DELETE CASCADE` or similar measure on the second relation * Does not take care of setting the primary key when adding features. Either users need to be instructed to set them manually or - if it's a database derived value - the layers need to be in transaction mode (currently only activatable through the API)
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printf "[qgis_test]\nhost=localhost\ndbname=qgis_test\nuser=postgres" > ~/.pg_service.conf | ||
psql -c 'CREATE DATABASE qgis_test;' -U postgres | ||
psql -f $TRAVIS_BUILD_DIR/tests/testdata/provider/testdata.sql -U postgres -d qgis_test | ||
psql -f $TRAVIS_BUILD_DIR/tests/testdata/provider/reltests.sql -U postgres -d qgis_test |
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/*************************************************************************** | ||
qgsrelationwidgetwrapper.h | ||
-------------------------------------- | ||
Date : 14.5.2014 | ||
Copyright : (C) 2014 Matthias Kuhn | ||
Email : matthias at opengis dot ch | ||
*************************************************************************** | ||
* * | ||
* This program is free software; you can redistribute it and/or modify * | ||
* it under the terms of the GNU General Public License as published by * | ||
* the Free Software Foundation; either version 2 of the License, or * | ||
* (at your option) any later version. * | ||
* * | ||
***************************************************************************/ | ||
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class QgsRelationWidgetWrapper : QgsWidgetWrapper | ||
{ | ||
%TypeHeaderCode | ||
#include <qgsrelationwidgetwrapper.h> | ||
%End | ||
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public: | ||
explicit QgsRelationWidgetWrapper( QgsVectorLayer* vl, const QgsRelation& relation, QWidget* editor = 0, QWidget* parent /TransferThis/ = 0 ); | ||
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protected: | ||
QWidget* createWidget( QWidget* parent ); | ||
void initWidget( QWidget* editor ); | ||
bool valid() const; | ||
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public slots: | ||
void setFeature( const QgsFeature& feature ); | ||
}; |
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/*************************************************************************** | ||
qgsfeatureselectiondlg.sip | ||
-------------------------------------- | ||
Date : 30.11.2015 | ||
Copyright : (C) 2015 Matthias Kuhn | ||
Email : matthias at opengis dot ch | ||
*************************************************************************** | ||
* * | ||
* This program is free software; you can redistribute it and/or modify * | ||
* it under the terms of the GNU General Public License as published by * | ||
* the Free Software Foundation; either version 2 of the License, or * | ||
* (at your option) any later version. * | ||
* * | ||
***************************************************************************/ | ||
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// This is required for the ConvertToSubClassCode to work properly | ||
// so RTTI for casting is available in the whole module. | ||
%ModuleCode | ||
#include "qgsfeatureselectiondlg.h" | ||
%End | ||
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class QgsFeatureSelectionDlg : QDialog | ||
{ | ||
%TypeHeaderCode | ||
#include "qgsfeatureselectiondlg.h" | ||
%End | ||
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%ConvertToSubClassCode | ||
if ( qobject_cast<QgsFeatureSelectionDlg*>( sipCpp ) ) | ||
sipType = sipType_QgsFeatureSelectionDlg; | ||
else | ||
sipType = 0; | ||
%End | ||
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public: | ||
explicit QgsFeatureSelectionDlg( QgsVectorLayer* vl, QgsAttributeEditorContext &context, QWidget *parent /TransferThis/ = 0 ); | ||
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/** | ||
* Get the selected features | ||
* | ||
* @return The selected feature ids | ||
*/ | ||
const QgsFeatureIds& selectedFeatures(); | ||
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/** | ||
* Set the selected features | ||
* @param ids The feature ids to select | ||
*/ | ||
void setSelectedFeatures( const QgsFeatureIds& ids ); | ||
}; |
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/*************************************************************************** | ||
qgsrelationeditorwidget.sip | ||
-------------------------------------- | ||
Date : 28.11.2015 | ||
Copyright : (C) 2015 Matthias Kuhn | ||
Email : matthias at opengis dot ch | ||
*************************************************************************** | ||
* * | ||
* This program is free software; you can redistribute it and/or modify * | ||
* it under the terms of the GNU General Public License as published by * | ||
* the Free Software Foundation; either version 2 of the License, or * | ||
* (at your option) any later version. * | ||
* * | ||
***************************************************************************/ | ||
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%ModuleCode | ||
#include "qgsrelationeditorwidget.h" | ||
%End | ||
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class QgsRelationEditorWidget : QgsCollapsibleGroupBox | ||
{ | ||
%TypeHeaderCode | ||
#include <qgsrelationeditorwidget.h> | ||
%End | ||
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%ConvertToSubClassCode | ||
if ( qobject_cast<QgsRelationEditorWidget*>( sipCpp ) ) | ||
sipType = sipType_QgsRelationEditorWidget; | ||
else | ||
sipType = 0; | ||
%End | ||
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public: | ||
/** | ||
* @param parent parent widget | ||
*/ | ||
QgsRelationEditorWidget( QWidget* parent /TransferThis/= 0 ); | ||
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//! Define the view mode for the dual view | ||
void setViewMode( QgsDualView::ViewMode mode ); | ||
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//! Get the view mode for the dual view | ||
QgsDualView::ViewMode viewMode(); | ||
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void setRelationFeature( const QgsRelation& relation, const QgsFeature& feature ); | ||
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/** | ||
* Set the relation(s) for this widget | ||
* If only one relation is set, it will act as a simple 1:N relation widget | ||
* If both relations are set, it will act as an N:M relation widget | ||
* inserting and deleting entries on the intermediate table as required. | ||
* | ||
* @param relation Relation referencing the edited table | ||
* @param nmrelation Optional reference from the referencing table to a 3rd N:M table | ||
*/ | ||
void setRelations( const QgsRelation& relation, const QgsRelation& nmrelation ); | ||
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void setFeature( const QgsFeature& feature ); | ||
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void setEditorContext( const QgsAttributeEditorContext& context ); | ||
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/** | ||
* The feature selection manager is responsible for the selected features | ||
* which are currently being edited. | ||
*/ | ||
QgsIFeatureSelectionManager* featureSelectionManager(); | ||
}; |
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