public function testRead()
{
$data = [['id' => 1, 'name' => 'foo', 'group' => 'admin'], ['id' => 2, 'name' => 'bar', 'group' => 'user'], ['id' => 3, 'name' => 'foobar', 'group' => 'user'], ['id' => 4, 'name' => 'foo', 'group' => 'admin'], ['id' => 5, 'name' => 'baz', 'group' => 'user'], ['id' => 6, 'name' => 'foobaz', 'group' => 'user']];
// Select all
$source = new ArrayDataSource($data);
$selection = new ReadSelectionBuilder($source);
$this->assertEquals(6, count($selection->toArray()));
$this->assertEquals($data, $selection->toArray());
// Select with a predicate
$source = new ArrayDataSource($data);
$selection = new ReadSelectionBuilder($source);
$selection = $selection->where('group = %s', 'user');
$this->assertEquals(4, count($selection->toArray()));
$this->assertNotContains($data[0], $selection->toArray());
$this->assertContains($data[1], $selection->toArray());
// Select with groups
$source = new ArrayDataSource($data);
$selection = new ReadSelectionBuilder($source);
$selection = $selection->groupBy(['group']);
$this->assertEquals(2, count($selection->toArray()));
$source = new ArrayDataSource($data);
$selection = new ReadSelectionBuilder($source);
$selection = $selection->groupBy(['group', 'name'], E::e('name in %s()', ['foo', 'bar', 'foobar']));
$this->assertEquals(3, count($selection->toArray()));
// Select with limit
$source = new ArrayDataSource($data);
$selection = new ReadSelectionBuilder($source);
$selection = $selection->limit(1);
$this->assertEquals(1, count($selection->toArray()));
$this->assertContains($data[0], $selection->toArray());
// Select with projection
$source = new ArrayDataSource($data);
$selection = new ReadSelectionBuilder($source);
$projection = $selection->select(['n' => 'name']);
$this->assertEquals(6, iterator_count($projection));
foreach ($projection as $record) {
$this->assertEquals(['n'], array_keys($record));
}
}
/**
* Make a projection.
*
* @param string|string[]|Expression|Expression[] $expression
* Expression or array of expressions (if the keys are strings,
* they are used as aliases).
* @param string $alias
* Alias.
* @return \Iterator A {@see Record} iterator.
* @todo Rename to 'project' ?
*/
public function select($expression, $alias = null)
{
$selection = new ReadSelectionBuilder($this->getSource());
return $selection->select($expression, $alias);
}
