kysely
Version:
Type safe SQL query builder
43 lines (42 loc) • 1.58 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.DeduplicateJoinsTransformer = void 0;
const operation_node_transformer_js_1 = require("../../operation-node/operation-node-transformer.js");
const object_utils_js_1 = require("../../util/object-utils.js");
class DeduplicateJoinsTransformer extends operation_node_transformer_js_1.OperationNodeTransformer {
transformSelectQuery(node) {
return this.#transformQuery(super.transformSelectQuery(node));
}
transformUpdateQuery(node) {
return this.#transformQuery(super.transformUpdateQuery(node));
}
transformDeleteQuery(node) {
return this.#transformQuery(super.transformDeleteQuery(node));
}
#transformQuery(node) {
if (!node.joins || node.joins.length === 0) {
return node;
}
return (0, object_utils_js_1.freeze)({
...node,
joins: this.#deduplicateJoins(node.joins),
});
}
#deduplicateJoins(joins) {
const out = [];
for (let i = 0; i < joins.length; ++i) {
let foundDuplicate = false;
for (let j = i + 1; j < joins.length; ++j) {
if ((0, object_utils_js_1.compare)(joins[i], joins[j])) {
foundDuplicate = true;
break;
}
}
if (!foundDuplicate) {
out.push(joins[i]);
}
}
return (0, object_utils_js_1.freeze)(out);
}
}
exports.DeduplicateJoinsTransformer = DeduplicateJoinsTransformer;