@cran/gql.jm/mjs/withSqlJoin.js

Cran/GraphQL Join Monster Utilities

import { MapperKind, createDirective, getExtension } from "@cran/gql.core";
export function withSqlJoin(name = "sqlJoin") {
    return createDirective(name, {
        column: "text!",
        identity: "bool",
        references: "text",
        in: "text",
        contains: "text",
    }, {
        [MapperKind.COMPOSITE_FIELD]([directive,], field) {
            Object.assign(getExtension(field, "joinMonster", {}), { sqlJoin: makeResolver(directive), });
        },
    });
}
function makeResolver(directive) {
    switch (false) {
        case !directive.identity:
            return makeIdentity(directive.column);
        case !directive.references:
            return makeReferences(directive.column, directive.references);
        case !directive.in:
            return makeIn(directive.column, directive.in);
        case !directive.contains:
            return makeContains(directive.column, directive.contains);
        default: return makeError(directive);
    }
}
function makeIdentity(column) {
    return function sqlReferences(table, foreign) {
        return `${table}."${column}" = ${foreign}."${column}"`;
    };
}
function makeReferences(column, references) {
    return function sqlReferences(table, foreign) {
        return `${table}."${column}" = ${foreign}."${references}"`;
    };
}
function makeIn(column, references) {
    return function sqlIn(table, foreign) {
        return `${table}."${column}" = any(${foreign}."${references}")`;
    };
}
function makeContains(column, references) {
    return function sqlIn(table, foreign) {
        return `${foreign}."${references}" = any(${table}."${column}")`;
    };
}
function makeError(directive) {
    return function sqlError() {
        throw new Error(`SqlJoin: no join operation selected on ${JSON.stringify(directive)}`);
    };
}