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product_reviews_contract.sol

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+// SPDX-License-Identifier: GPL-3.0-or-later
+pragma solidity ^0.8.0;
+
+contract productReviews {
+    struct Review {
+        uint reviewId;
+        uint productId;
+        string description;
+        uint rating;
+        address reviewer;
+    }
+
+    uint public reviewId = 1;
+    Review[] public reviews;
+
+    function addReview(uint _productId, string memory _description, uint _rating) external {
+        if(_isRatingOk(_rating)) {
+            reviews.push(Review(reviewId, _productId, _description, _rating, msg.sender));
+        }
+        reviewId++;
+        revert('Rating invalid');
+    }
+
+    function _isRatingOk(uint _rating) internal pure returns (bool) { // azt allitja, hogy folosleges a returns deklaralasa, ha nincs elnevezve, viszont ha kitorlom, panaszkodik a return parameterek szama miatt...
+        if(_rating < 6 && _rating > 0) {
+            return true;
+        }
+    }
+
+    function isOwner(uint _reviewId) public view returns (bool) {
+        if(msg.sender == reviews[_reviewId].reviewer) {
+            return true;
+        }
+    }
+
+    function _deleteReview(uint _reviewId) private {
+        if(isOwner(_reviewId) == true) {
+            delete reviews[_reviewId];
+        }
+        revert('User is not review owner');
+    }
+}