feat: manyToMany support

Signed-off-by: Pranav C Balan <pranavxc@gmail.com>

README.md

@@ -238,3 +238,25 @@ Our mission is to provide the most powerful no-code interface for databases whic
 - - - - - - -
 
 
+### Has Many - Schema
+
+- Create
+    * Create a new relation
+        - Create foreign key in child table
+        - Update metadata
+    * Existing
+        - We need to show existing relation
+        - Update metadata
+- Delete
+    * Delete virtual field
+    * Delete virtual field and relation 
+    
+- HasMany Lookup column
+    * Rendering
+    * Adding new child
+        - Associate an existing child
+        - Create and add 
+    * Pagination
+    * Remove child
+    
+

packages/nc-gui/components/project/spreadsheet/apis/restApi.js

@@ -7,9 +7,8 @@ export default class RestApi {
 
   // todo:  - get version letter and use table alias
   async list(params) {
-    const data = await this.get(`/nc/${this.$ctx.$route.params.project_id}/api/v1/${this.table}`, params);
-// data.headers['xc-db-response'];
-
+    // const data = await this.get(`/nc/${this.$ctx.$route.params.project_id}/api/v1/${this.table}`, params)
+    const data = await this.get(`/nc/${this.$ctx.$route.params.project_id}/api/v1/${this.table}/nestedList`, params)
     return data.data;
   }
 

packages/nc-gui/components/project/spreadsheet/mixins/spreadsheet.js

@@ -103,7 +103,10 @@ export default {
         limit: this.size,
         offset: this.size * (this.page - 1),
         where: this.concatenatedXWhere,
-        sort: this.sort
+        sort: this.sort,
+        childs: (this.meta && this.meta.hasMany && this.meta.hasMany.map(hm => hm.tn).join())||'',
+        parents: (this.meta && this.meta.belongsTo && this.meta.belongsTo.map(hm => hm.rtn).join())||'',
+        many: (this.meta && this.meta.manyToMany && this.meta.manyToMany.map(mm => mm.rtn).join())||''
       }
     }, colLength() {
       return (this.availableColumns && this.availableColumns.length) || 0

packages/nc-gui/components/project/spreadsheet/views/xcGridView.vue

@@ -40,6 +40,29 @@
           <!--{{ col.cn }}-->
         </th>
 
+
+        <th v-for="bt in meta.belongsTo"
+            class="grey-border caption font-wight-regular"
+            :class="$store.state.windows.darkTheme ? 'grey darken-3 grey--text text--lighten-1' : 'grey lighten-4  grey--text text--darken-2'"
+        >
+          {{ bt._rtn }} (Belongs To)
+        </th>
+
+        <th v-for="hm in meta.hasMany"
+            class="grey-border caption font-wight-regular"
+            :class="$store.state.windows.darkTheme ? 'grey darken-3 grey--text text--lighten-1' : 'grey lighten-4  grey--text text--darken-2'"
+        >
+          {{ hm._tn }} (Has Many)
+        </th>
+
+        <th v-for="mm in meta.manyToMany"
+            class="grey-border caption font-wight-regular"
+            :class="$store.state.windows.darkTheme ? 'grey darken-3 grey--text text--lighten-1' : 'grey lighten-4  grey--text text--darken-2'"
+        >
+          {{ mm.rtn }} (Many To Many)
+        </th>
+
+
         <th
           v-if="!isLocked && !isVirtual && !isPublicView && _isUIAllowed('add-column')"
           @click="addNewColMenu = true"
@@ -63,6 +86,7 @@
           </v-menu>
         </th>
 
+
       </tr>
       </thead>
       <tbody>
@@ -261,6 +285,25 @@
                       :sql-ui="sqlUi"
           ></table-cell>
         </td>
+
+
+        <td v-for="(bt,i) in meta.belongsTo" class="caption">
+          <v-chip x-small v-if="rowObj[bt._rtn]" :color="colors[i%colors.length]">{{ Object.values(rowObj[bt._rtn])[1] }}</v-chip>
+        </td>
+
+        <td v-for="hm in meta.hasMany" class="caption">
+          <v-chip v-if="Array.isArray(rowObj[hm._tn])" x-small v-for="(v,i) in rowObj[hm._tn].map(v=>Object.values(v)[1])" :color="colors[i%colors.length]">
+            {{ v }}
+          </v-chip>
+        </td>
+        <td v-for="mm in meta.manyToMany" class="caption">
+          <v-chip v-if="rowObj[mm._rtn]" x-small v-for="(v,i) in rowObj[mm._rtn].map(v=>Object.values(v)[2])" :color="colors[i%colors.length]">{{
+              v
+            }}
+          </v-chip>
+        </td>
+
+
       </tr>
       <tr v-if="!isLocked && !isPublicView && isEditable && relationType !== 'bt'">
         <td :colspan="visibleColLength + 1" class="text-left pointer" @click="insertNewRow(true)">

packages/nocodb/src/lib/dataMapper/lib/BaseModel.ts

@@ -60,6 +60,7 @@ abstract class BaseModel {
   protected pks: any[];
   protected hasManyRelations: any;
   protected belongsToRelations: any;
+  protected manyToManyRelations: any;
   protected config: any;
   protected clientType: string;
   public readonly type: string;

packages/nocodb/src/lib/dataMapper/lib/sql/BaseModelSql.ts

@@ -39,6 +39,7 @@ class BaseModelSql extends BaseModel {
       columns,
       hasMany = [],
       belongsTo = [],
+      manyToMany = [],
       type,
       dbModels
     }: {
@@ -63,6 +64,7 @@ class BaseModelSql extends BaseModel {
     this.pks = columns.filter(c => c.pk === true);
     this.hasManyRelations = hasMany;
     this.belongsToRelations = belongsTo;
+    this.manyToManyRelations = manyToMany;
     this.config = {
       limitDefault: process.env.DB_QUERY_LIMIT_DEFAULT || 10,
       limitMax: process.env.DB_QUERY_LIMIT_MAX || 500,

packages/nocodb/src/lib/noco/common/BaseApiBuilder.ts

@@ -737,8 +737,6 @@ export default abstract class BaseApiBuilder<T extends Noco> implements XcDynami
 
   protected initDbDriver(): void {
     if (!this.dbDriver) {
-
-
       if (this.connectionConfig?.connection?.ssl && typeof this.connectionConfig?.connection?.ssl === 'object') {
         if (this.connectionConfig.connection.ssl.caFilePath) {
           this.connectionConfig.connection.ssl.ca = fs
@@ -1497,6 +1495,64 @@ export default abstract class BaseApiBuilder<T extends Noco> implements XcDynami
   public getProjectId() {
     return this.projectId;
   }
+
+
+  protected async getManyToManyRelations() {
+    const metas = new Set<any>();
+
+    for (const meta of Object.values(this.metas)) {
+
+      // check if table is a Bridge table(or Associative Table) by checking
+      // number of foreign keys and columns
+      if (meta.belongsTo?.length === 2 && meta.columns.length < 4) {
+        const tableMetaA = this.metas[meta.belongsTo[0].rtn];
+        const tableMetaB = this.metas[meta.belongsTo[1].rtn];
+
+        // add manytomany data under metadata of both related columns
+        tableMetaA.manyToMany = tableMetaA.manyToMany || [];
+        tableMetaA.manyToMany.push({
+          "tn": tableMetaA.tn,
+          "cn": meta.belongsTo[0].rcn,
+          "vtn": meta.tn,
+          "vcn": meta.belongsTo[0].cn,
+          "vrcn": meta.belongsTo[1].cn,
+          "rtn": meta.belongsTo[1].rtn,
+          "rcn": meta.belongsTo[1].rcn,
+          "_tn": tableMetaA._tn,
+          "_cn": meta.belongsTo[0]._rcn,
+          "_rtn": meta.belongsTo[1]._rtn,
+          "_rcn": meta.belongsTo[1]._rcn
+        })
+        tableMetaB.manyToMany = tableMetaB.manyToMany || [];
+        tableMetaB.manyToMany.push({
+          "tn": tableMetaB.tn,
+          "cn": meta.belongsTo[1].rcn,
+          "vtn": meta.tn,
+          "vcn": meta.belongsTo[1].cn,
+          "vrcn": meta.belongsTo[0].cn,
+          "rtn": meta.belongsTo[0].rtn,
+          "rcn": meta.belongsTo[0].rcn,
+          "_tn": tableMetaB._tn,
+          "_cn": meta.belongsTo[1]._rcn,
+          "_rtn": meta.belongsTo[0]._rtn,
+          "_rcn": meta.belongsTo[0]._rcn
+        })
+        metas.add(tableMetaA)
+        metas.add(tableMetaB)
+      }
+    }
+
+    // Update metadata of tables which have manytomany relation
+    // and recreate basemodel with new meta information
+    for (const meta of metas) {
+      await this.xcMeta.metaUpdate(this.projectId, this.dbAlias, 'nc_models', {
+        meta: JSON.stringify(meta)
+      }, {title: meta.tn})
+      XcCache.del([this.projectId, this.dbAlias, 'table', meta.tn].join('::'));
+      this.models[meta.tn] = this.getBaseModel(meta)
+    }
+  }
+
 }
 
 export {IGNORE_TABLES};

packages/nocodb/src/lib/noco/gql/GqlApiBuilder.ts

@@ -620,12 +620,10 @@ export class GqlApiBuilder extends BaseApiBuilder<Noco> implements XcMetaMgr {
             await NcHelp.executeOperations(insertResolvers, this.connectionConfig.client);
           }
         }
-
       });
 
       await NcHelp.executeOperations(tableResolvers, this.connectionConfig.client);
 
-
       await Promise.all(Object.entries(this.metas).map(async ([tn, schema]) => {
 
         for (const hm of schema.hasMany) {
@@ -757,6 +755,8 @@ export class GqlApiBuilder extends BaseApiBuilder<Noco> implements XcMetaMgr {
         }
 
       }));
+
+      await this.getManyToManyRelations();
     }
 
   }

packages/nocodb/src/lib/noco/rest/RestApiBuilder.ts

@@ -53,14 +53,10 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
   constructor(app: Noco, projectBuilder: NcProjectBuilder, config: NcConfig, connectionConfig: DbConfig, xcMeta?: NcMetaIO) {
     super(app, projectBuilder, config, connectionConfig);
     autoBind(this)
-
-    this.models = {};
     this.controllers = {};
     this.routers = {};
     this.hooks = {};
     this.xcMeta = xcMeta;
-
-
   }
 
 
@@ -292,7 +288,6 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
     let tables;
     const swaggerRefs: { [table: string]: any[] } = {};
 
-
     /* Get all relations */
     const relations = await this.relationsSyncAndGet();
     this.relationsCount = relations.length;
@@ -545,11 +540,7 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
             this.controllers[name].mapRoutes(router, this.customRoutes);
           }
         });
-
-
       }
-
-
     });
 
     /* handle xc_tables update in parallel */
@@ -557,6 +548,9 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
     await NcHelp.executeOperations(relationRoutes, this.connectionConfig.client);
 
 
+    await this.getManyToManyRelations();
+
+
     const swaggerDoc = {
       tags: [],
       paths: {},

packages/nocodb/src/lib/noco/rest/RestCtrl.ts

@@ -135,7 +135,15 @@ export class RestCtrl extends RestBaseCtrl {
     const data = await req.model.delb(req.body)
     res.json(data);
   }
-
+  public async nestedList(req: Request | any, res): Promise<void> {
+    const startTime = process.hrtime();
+    const data = await req.model.nestedList({
+      ...req.query
+    } as any);
+    const elapsedSeconds = parseHrtimeToSeconds(process.hrtime(startTime));
+    res.setHeader('xc-db-response', elapsedSeconds);
+    res.xcJson(data);
+  }
 
   protected async middleware(req: Request | any, res: Response, next: NextFunction): Promise<any> {
 

packages/nocodb/src/lib/sqlMgr/code/routes/xc-ts/ExpressXcTsRoutes.ts

@@ -12,7 +12,7 @@ class ExpressXcTsRoutes extends BaseRender {
    * @param ctx.columns
    * @param ctx.relations
    */
-  constructor({dir, filename, ctx}:any) {
+  constructor({dir, filename, ctx}: any) {
     super({dir, filename, ctx});
   }
 
@@ -21,7 +21,7 @@ class ExpressXcTsRoutes extends BaseRender {
    */
   prepare() {
 
-    let data:any = {};
+    let data: any = {};
 
     /* example of simple variable */
     data = this.ctx;
@@ -31,9 +31,8 @@ class ExpressXcTsRoutes extends BaseRender {
   }
 
 
-
   getObject() {
-    const ejsData:any = this.prepare();
+    const ejsData: any = this.prepare();
     const routes = [
       {
         path: `/api/${this.ctx.routeVersionLetter}/${ejsData._tn}`,
@@ -63,6 +62,23 @@ async function(req, res){
 async function(req, res){
     const data = await req.model.findOne(req.query);
     res.json(data);
+}
+        `]
+      }, {
+        path: `/api/${this.ctx.routeVersionLetter}/${ejsData._tn}/nestedList`,
+        type: 'get',
+        handler: ['nestedList'],
+        acl: {
+          admin: true,
+          user: true,
+          guest: true
+        },
+        functions: [`
+async function(req, res){
+    const data = await req.parentModel.hasManyList({
+      ...req.query
+    });
+    res.json(data);
 }
                 `]
       }, {
@@ -290,7 +306,7 @@ async function(req, res){
     res.json(data);
 }
         `]
-      },
+      }
     ];
 
     if (this.ctx.type === 'view') {