@dataplan/pg
Version:
PostgreSQL step classes for Grafast
49 lines • 2.42 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.PgManyFilter = void 0;
const tslib_1 = require("tslib");
const grafast_1 = require("grafast");
const pg_sql2_1 = tslib_1.__importDefault(require("pg-sql2"));
const pgTempTable_js_1 = require("../steps/pgTempTable.js");
const pgClassFilter_js_1 = require("./pgClassFilter.js");
class PgManyFilter extends grafast_1.Modifier {
static { this.$$export = {
moduleName: "@dataplan/pg",
exportName: "PgManyFilter",
}; }
constructor($parentFilterPlan, childDataSource, myAttrs, theirAttrs) {
super($parentFilterPlan);
this.childDataSource = childDataSource;
this.myAttrs = myAttrs;
this.theirAttrs = theirAttrs;
this.someTemp = null;
if (myAttrs.length !== theirAttrs.length) {
throw new Error("Expected the local and remote attributes to have the same number of entries.");
}
}
some() {
const tempTable = new pgTempTable_js_1.PgTempTable(this.parent, this.childDataSource);
// Implement the relationship
this.myAttrs.forEach((attr, i) => {
tempTable.where((0, pg_sql2_1.default) `${this.parent.alias}.${pg_sql2_1.default.identifier(attr)} = ${tempTable.alias}.${pg_sql2_1.default.identifier(this.theirAttrs[i])}`);
});
const $filter = new pgClassFilter_js_1.PgClassFilter(tempTable.wherePlan(), tempTable.alias);
this.someTemp = tempTable;
return $filter;
}
apply() {
if (this.someTemp) {
const conditions = this.someTemp.conditions;
const from = (0, pg_sql2_1.default) `\nfrom ${this.someTemp.fromExpression()} as ${this.someTemp.alias}`;
const sqlConditions = pg_sql2_1.default.join(conditions.map((c) => pg_sql2_1.default.parens(pg_sql2_1.default.indent(c))), " and ");
const where = conditions.length === 0
? pg_sql2_1.default.blank
: conditions.length === 1
? (0, pg_sql2_1.default) `\nwhere ${sqlConditions}`
: (0, pg_sql2_1.default) `\nwhere\n${pg_sql2_1.default.indent(sqlConditions)}`;
this.parent.where((0, pg_sql2_1.default) `exists(${pg_sql2_1.default.indent((0, pg_sql2_1.default) `select 1${from}${where}`)})`);
}
}
}
exports.PgManyFilter = PgManyFilter;
//# sourceMappingURL=pgManyFilter.js.map