Zesty Bean & Feta Crunch Salad

• 400 g tin cannellini beans, drained and rinsed well
• 400 g tin black beans, drained and rinsed well
• 400 g tin chickpeas, drained and rinsed well
• 400 g tin red kidney beans, drained and rinsed well
• 1 medium red onion, finely chopped
• 1 cup celery, finely chopped
• 0.5 cup parsley leaves, finely chopped
• 1 cup sweet and sour pickles, finely chopped
• 1 cup feta, crumbed
• 2 garlic cloves, minced
• 2 tbsp red wine vinegar
• 1 lemon, juiced
• 1 tsp Dijon mustard
• 1 tsp chili flakes
• 0.333 cup extra-virgin olive oil