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<?php |
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namespace App\Judite\Models; |
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use Illuminate\Database\Eloquent\Model; |
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use App\Exceptions\EnrollmentCannotBeDeleted; |
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use App\Exceptions\StudentIsNotEnrolledInCourseException; |
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use App\Exceptions\UserIsAlreadyEnrolledInCourseException; |
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class Student extends Model |
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{ |
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/** |
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* The relations to eager load on every query. |
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* |
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* @var array |
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*/ |
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protected $with = ['user']; |
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/** |
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* The attributes that are mass assignable. |
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* |
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* @var array |
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*/ |
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protected $fillable = ['student_number']; |
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/** |
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* Get user who owns this student. |
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* |
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* @return \Illuminate\Database\Eloquent\Relations\BelongsTo |
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*/ |
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public function user() |
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{ |
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return $this->belongsTo(User::class); |
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} |
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/** |
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* Get exchanges requested by this student. |
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* |
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* @return \Illuminate\Database\Eloquent\Builder |
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*/ |
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public function requestedExchanges() |
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{ |
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$enrollmentsRelationship = $this->enrollments(); |
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$enrollmentsKeyName = $enrollmentsRelationship->getRelated()->getKeyName(); |
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$enrollmentsIdsQuery = $enrollmentsRelationship |
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->select($enrollmentsKeyName) |
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->getBaseQuery(); |
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return Exchange::whereFromEnrollmentIn($enrollmentsIdsQuery); |
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} |
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/** |
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* Get exchanges proposed to this student. |
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* |
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* @return \Illuminate\Database\Eloquent\Builder |
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*/ |
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public function proposedExchanges() |
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{ |
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$enrollmentsRelationship = $this->enrollments(); |
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$enrollmentsKeyName = $enrollmentsRelationship->getRelated()->getKeyName(); |
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$enrollmentsIdsQuery = $enrollmentsRelationship |
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->select($enrollmentsKeyName) |
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->getBaseQuery(); |
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return Exchange::whereToEnrollmentIn($enrollmentsIdsQuery); |
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} |
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/** |
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* Get enrollments of this student. |
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* |
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* @return \Illuminate\Database\Eloquent\Relations\HasMany |
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*/ |
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public function enrollments() |
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{ |
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return $this->hasMany(Enrollment::class); |
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} |
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/** |
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* Get enrollment of this student in a given course. |
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* |
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* @param \App\Judite\Models\Course $course |
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* |
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* @return \App\Judite\Models\Enrollment|null |
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*/ |
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public function getEnrollmentInCourse(Course $course) |
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{ |
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return $this->enrollments() |
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->where('course_id', $course->id) |
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->first(); |
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} |
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/** |
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* Enroll this student with a given course. |
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* |
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* @param \App\Judite\Models\Course $course |
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* |
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* @throws \App\Exceptions\UserIsAlreadyEnrolledInCourseException |
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* |
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* @return \App\Judite\Models\Enrollment |
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*/ |
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public function enroll(Course $course): Enrollment |
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{ |
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if ($this->isEnrolledInCourse($course)) { |
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throw new UserIsAlreadyEnrolledInCourseException($course); |
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} |
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$enrollment = $this->enrollments()->make(); |
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$enrollment->course()->associate($course); |
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$enrollment->save(); |
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return $enrollment; |
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} |
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/** |
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* Check if this student is enrolled in a course. |
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* |
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* @param \App\Judite\Models\Course $course |
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* |
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* @return bool |
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*/ |
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public function isEnrolledInCourse(Course $course): bool |
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{ |
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return $this->enrollments()->where('course_id', $course->id)->exists(); |
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} |
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/** |
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* Remove enrollment in the given course. |
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* |
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* @param \App\Judite\Models\Course $course |
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* |
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* @throws \App\Exceptions\StudentIsNotEnrolledInCourseException|\App\Exceptions\EnrollmentCannotBeDeleted |
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* |
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* @return bool |
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*/ |
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public function unenroll(Course $course): bool |
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{ |
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$enrollment = $this->getEnrollmentInCourse($course); |
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if (is_null($enrollment)) { |
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throw new StudentIsNotEnrolledInCourseException($course); |
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} |
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if (! $enrollment->isDeletable()) { |
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throw new EnrollmentCannotBeDeleted($enrollment); |
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} |
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return $enrollment->delete(); |
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} |
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/** |
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* Scope a query to only include users with the given student number. |
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* |
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* @param \Illuminate\Database\Eloquent\Builder $query |
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* @param string $studentNumber |
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* |
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* @return \Illuminate\Database\Eloquent\Builder |
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*/ |
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public function scopeWhereNumber($query, $studentNumber) |
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{ |
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return $query->where('student_number', $studentNumber); |
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} |
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} |
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Hackathonners /
swap
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