Add Model

app/Models/Category.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Category extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_categories';
+
+    protected $fillable = [
+        'content',
+        'content_vi',
+        'description',
+        'status',
+    ];
+
+    public function exercises()
+    {
+        return $this->hasMany(Exercise::class, 'category_id');
+    }
+}

app/Models/Exercise.php

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+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Exercise extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_exercises';
+
+    protected $fillable = [
+        'subject_id',
+        'lesson_name',
+        'description',
+        'level',
+        'avatar',
+        'status',
+        'category_id',
+        'skill_id',
+        'year',
+        'media_object_id',
+    ];
+
+    public function subject()
+    {
+        return $this->belongsTo(Subject::class, 'subject_id');
+    }
+
+    public function category()
+    {
+        return $this->belongsTo(Category::class, 'category_id');
+    }
+
+    public function skill()
+    {
+        return $this->belongsTo(Skill::class, 'skill_id');
+    }
+
+    public function questionGroups()
+    {
+        return $this->hasMany(QuestionGroup::class, 'exercise_id');
+    }
+
+    public function questions()
+    {
+        return $this->hasMany(Question::class, 'exercise_id');
+    }
+}

app/Models/ExerciseQuestion.php

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+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class ExerciseQuestion extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_exercise_questions';
+
+    protected $fillable = [
+        'exercise_id',
+        'question_id',
+        'position',
+    ];
+}

app/Models/Media.php

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+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Media extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_media';
+
+    protected $fillable = [
+        'object_id',
+        'file_name',
+        'file_url',
+        'mime_type',
+        'size_bytes',
+        'position',
+    ];
+
+    // Gợi ý: nếu cần polymorphic, bạn sẽ thay bằng morphTo()
+}

app/Models/Question.php

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+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Question extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_questions';
+
+    protected $fillable = [
+        'exercise_id',
+        'content',
+        'description',
+        'group_id',
+        'question_type_id',
+        'level',
+        'score',
+        'answer',
+        'explanation',
+        'hint',
+        'media_object_id',
+    ];
+
+    public function exercise()
+    {
+        return $this->belongsTo(Exercise::class, 'exercise_id');
+    }
+
+    public function group()
+    {
+        return $this->belongsTo(QuestionGroup::class, 'group_id');
+    }
+
+    public function type()
+    {
+        return $this->belongsTo(QuestionType::class, 'question_type_id');
+    }
+
+    public function choices()
+    {
+        return $this->hasMany(QuestionChoice::class, 'question_id');
+    }
+
+    public function blanks()
+    {
+        return $this->hasMany(QuestionBlank::class, 'question_id');
+    }
+}

app/Models/QuestionBlank.php

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+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class QuestionBlank extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_question_blanks';
+
+    protected $fillable = [
+        'question_id',
+        'position',
+        'correct_answer',
+        'other_answers',
+    ];
+
+    public function question()
+    {
+        return $this->belongsTo(Question::class, 'question_id');
+    }
+}

app/Models/QuestionChoice.php

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+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class QuestionChoice extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_question_choices';
+
+    protected $fillable = [
+        'question_id',
+        'label',
+        'content',
+        'is_correct',
+        'media',
+        'media_object_id',
+        'position',
+    ];
+
+    public function question()
+    {
+        return $this->belongsTo(Question::class, 'question_id');
+    }
+}

app/Models/QuestionGroup.php

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+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class QuestionGroup extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_question_groups';
+
+    protected $fillable = [
+        'content',
+        'content_vi',
+        'exercise_id',
+        'is_question_order_fixed',
+        'is_option_order_fixed',
+        'position',
+        'paragraph',
+        'media_object_id',
+    ];
+
+    public function exercise()
+    {
+        return $this->belongsTo(Exercise::class, 'exercise_id');
+    }
+
+    public function questions()
+    {
+        return $this->hasMany(Question::class, 'group_id');
+    }
+}

app/Models/QuestionType.php

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+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class QuestionType extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_question_types';
+
+    protected $fillable = [
+        'name',
+        'code',
+        'description',
+        'status',
+    ];
+
+    public function questions()
+    {
+        return $this->hasMany(Question::class, 'question_type_id');
+    }
+}

app/Models/Skill.php

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+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Skill extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_skills';
+
+    protected $fillable = [
+        'name',
+        'code',
+        'description',
+    ];
+
+    public function exercises()
+    {
+        return $this->hasMany(Exercise::class, 'skill_id');
+    }
+}

app/Models/Subject.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Subject extends Model
+{
+    //
+}

database/migrations/2025_06_26_035409_create_se_subjects_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_subjects', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->string('code')->unique();
+            $table->text('description')->nullable();
+            $table->integer('status')->default(1); // true = active, false = inactive
+            $table->timestamps();
+            $table->softDeletes(); // deleted_at
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_subjects');
+    }
+};

database/migrations/2025_06_26_035709_create_se_categories_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_categories', function (Blueprint $table) {
+            $table->id();
+            $table->string('content');
+            $table->string('content_vi')->nullable();
+            $table->text('description')->nullable();
+            $table->integer('status')->default(1);
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_categories');
+    }
+};

database/migrations/2025_06_26_035807_create_se_skills_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_skills', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->string('code')->unique();
+            $table->text('description')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_skills');
+    }
+};

database/migrations/2025_06_26_035826_create_se_question_types_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_question_types', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->text('description')->nullable();
+            $table->string('code')->unique();
+            $table->integer('status')->default(1);
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_question_types');
+    }
+};

database/migrations/2025_06_26_035908_create_se_media_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_media', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('object_id');
+            $table->string('file_name');
+            $table->string('file_url');
+            $table->string('mime_type');
+            $table->unsignedBigInteger('size_bytes');
+            $table->integer('position')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_media');
+    }
+};

database/migrations/2025_06_26_035927_create_se_exercises_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_exercises', function (Blueprint $table) {
+            $table->id();
+
+            $table->unsignedBigInteger('subject_id');
+            $table->string('lesson_name');
+            $table->text('description')->nullable();
+            $table->integer('level')->default(0);
+            $table->string('avatar')->nullable();
+            $table->integer('status')->default(1); //
+            $table->unsignedBigInteger('category_id');
+            $table->unsignedBigInteger('skill_id');
+            $table->string('year')->nullable();
+            $table->unsignedBigInteger('media_object_id')->nullable();
+
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_exercises');
+    }
+};

database/migrations/2025_06_26_040018_create_se_question_groups_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_question_groups', function (Blueprint $table) {
+            $table->id();
+            $table->text('content');
+            $table->text('content_vi')->nullable();
+            $table->unsignedBigInteger('exercise_id');
+
+            $table->integer('is_question_order_fixed')->default(0);
+            $table->integer('is_option_order_fixed')->default(0);
+            $table->integer('position')->default(0);
+            $table->text('paragraph')->nullable();
+            $table->unsignedBigInteger('media_object_id')->nullable();
+
+            $table->timestamps();
+            $table->softDeletes();
+
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_question_groups');
+    }
+};

database/migrations/2025_06_26_040033_create_se_questions_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_questions', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('exercise_id');
+            $table->text('content');
+            $table->text('description')->nullable();
+            $table->unsignedBigInteger('group_id')->nullable();
+            $table->unsignedBigInteger('question_type_id');
+            $table->integer('level')->default(0);
+            $table->integer('score')->default(1);
+            $table->text('answer')->nullable();
+            $table->text('explanation')->nullable();
+            $table->text('hint')->nullable();
+            $table->unsignedBigInteger('media_object_id')->nullable();
+
+            $table->timestamps();
+            $table->softDeletes();
+
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_questions');
+    }
+};

database/migrations/2025_06_26_040054_create_se_exercise_questions_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_exercise_questions', function (Blueprint $table) {
+            $table->id();
+
+            $table->unsignedBigInteger('exercise_id');
+            $table->unsignedBigInteger('question_id');
+            $table->integer('position')->default(0);
+
+            $table->timestamps();
+            $table->softDeletes();
+
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_exercise_questions');
+    }
+};

database/migrations/2025_06_26_040122_create_se_question_choices_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_question_choices', function (Blueprint $table) {
+            $table->id();
+
+            // Chỉ giữ cột, không còn ràng buộc FK
+            $table->unsignedBigInteger('question_id');
+            $table->string('label')->nullable();
+            $table->text('content')->nullable();
+            $table->integer('is_correct')->default(0); // 0 = false, 1 = true
+            // $table->json('media')->nullable();
+            $table->unsignedBigInteger('media_object_id')->nullable();
+            $table->integer('position')->default(0);
+
+            $table->timestamps();
+            $table->softDeletes();
+
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_question_choices');
+    }
+};

database/migrations/2025_06_26_040136_create_se_question_blanks_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_question_blanks', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('question_id');
+            $table->integer('position')->default(0);
+            $table->text('correct_answer');
+            $table->json('other_answers')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_question_blanks');
+    }
+};