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feat(LeftJoinModel): Use QAbstractItemModel::match for searching key idx in right model 

It creates a possibility to transparently improve performance of id lookup
in right model by implementing fast search on given role in the righ model
itself by reimplementing QAbstractItemModel::match.

Closes: #12574
This commit is contained in:
Michał Cieślak 2023-10-30 11:03:46 +01:00 committed by Michał
parent 7847cb3b11
commit 04b6fb54c3
1 changed files with 8 additions and 15 deletions
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23
ui/StatusQ/src/leftjoinmodel.cpp
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@ -129,7 +129,7 @@ QVariant LeftJoinModel::data(const QModelIndex& index, int role) const
if (m_rightModelDestroyed)
return {};
QVariant joinRoleLeftValue = m_leftModel->data(idx, m_leftModelJoinRole);
auto joinRoleLeftValue = m_leftModel->data(idx, m_leftModelJoinRole);
if (m_lastUsedRightModelIndex.isValid()
&& m_rightModel->data(m_lastUsedRightModelIndex,
@ -139,22 +139,15 @@ QVariant LeftJoinModel::data(const QModelIndex& index, int role) const
role - m_rightModelRolesOffset);
}
int rightModelCount = m_rightModel->rowCount();
QModelIndexList match = m_rightModel->match(
m_rightModel->index(0, 0), m_rightModelJoinRole,
joinRoleLeftValue, 1, Qt::MatchExactly);
for (int i = 0; i < rightModelCount; i++) {
auto rightModelIdx = m_rightModel->index(i, 0);
auto rightJointRoleValue = m_rightModel->data(rightModelIdx,
m_rightModelJoinRole);
if (match.empty())
return {};
if (joinRoleLeftValue == rightJointRoleValue) {
m_lastUsedRightModelIndex = rightModelIdx;
return m_rightModel->data(rightModelIdx,
role - m_rightModelRolesOffset);
}
}
return {};
m_lastUsedRightModelIndex = match.first();
return match.first().data(role - m_rightModelRolesOffset);
}
void LeftJoinModel::setLeftModel(QAbstractItemModel* model)