feat: Vue package improvements and docs

Fix slot composing issue and add examples using vue library (#68)

docs/Cube.js-Frontend/@cubejs-client-vue.md

@@ -0,0 +1,95 @@
+---
+title: '@cubejs-client/vue'
+permalink: /@cubejs-client-vue
+category: Cube.js Frontend
+---
+
+`@cubejs-client/vue` provides Vue Components for easy integration Cube.js
+into Vue.js app.
+
+## QueryRenderer
+
+`<QueryRenderer />` Vue component takes a query, fetches the given query, and uses the slot scoped props to render the resulting data.
+
+### Props
+
+- `query`: analytic query. [Learn more about it's format](query-format).
+- `cubejsApi`: `CubejsApi` instance to use.
+
+### Scoped Slot Props
+
+- `resultSet`: A `resultSet` is an object containing data obtained from the query.  If this object is not defined, it means that the data is still being fetched. [ResultSet](@cubejs-client-core#result-set) object provides a convient interface for data munipulation.
+- `error`: Error will be defined if an error has occurred while fetching the query.
+- `loadingState`: Provides information about the state of the query loading.
+
+## QueryBuilder
+`<QueryBuilder />` is used to  build interactive analytics query builders. It abstracts state management and API calls to Cube.js Backend. It uses scoped slot props technique.
+
+### Props
+
+- `query`: default query.
+- `cubejsApi`: `CubejsApi` instance to use. Required.
+- `defaultChartType`: default value of chart type. Default: 'line'.
+
+### Scoped Slot Props
+
+- `measurers`, `dimensions`, `segments`, `timeDimensions`, `filters` - arrays of
+selected query builder members.
+- `availableMeasures`, `availableDimensions`, `availableTimeDimensions`,
+`availableSegments` - arrays of available to select members. They are loaded via
+API from Cube.js Backend.
+- `updateMeasures`, `updateDimensions`, `updateSegments`, `updateTimeDimensions` - objects with three functions: `add`, `remove`, and `update`. They are used to control the state of the query builder. Ex: `updateMeasures.add(newMeasure)`
+- `chartType` - string, containing currently selected chart type.
+- `updateChartType` - function-setter for chart type.
+- `isQueryPresent` - Bool indicating whether is query ready to be displayed or
+    not.
+- `query` - current query, based on selected members.
+- `resultSet`, `error`, `loadingState` - same as `<QueryRenderer />` [Scoped slot params.](#query-scoped-slot-props)
+
+### Example
+[Open in CodeSandbox](https://codesandbox.io/s/3rlxjkv2p)
+```vue
+<template>
+  <div class="hello">
+    <query-builder :cubejs-api="cubejsApi" :query="query">
+      <template v-slot="{ resultSet }">
+      </template>
+    </query-builder>
+  </div>
+</template>
+
+<script>
+import cubejs from '@cubejs-client/core';
+import { QueryBuilder } from '@cubejs-client/vue';
+import ChartRenderer from "./ChartRenderer.vue";
+
+const cubejsApi = cubejs(
+  'YOUR-CUBEJS-API-TOKEN',
+  { apiUrl: 'http://localhost:4000/cubejs-api/v1' },
+);
+
+export default {
+  name: "HelloWorld",
+  components: {
+    QueryBuilder,
+    ChartRenderer
+  },
+  data() {
+    const query = {
+      measures: ["LineItems.count", "LineItems.quantity", "Orders.count"],
+      timeDimensions: [
+        {
+          dimension: "LineItems.createdAt",
+          granularity: "month"
+        }
+      ]
+    };
+
+    return {
+      cubejsApi,
+      query
+    };
+  }
+};
+</script>
+```

docs/Getting-started.md

@@ -112,6 +112,13 @@ $ npm i --save @cubejs-client/core
 $ npm i --save @cubejs-client/react
 ```
 
+Vue:
+
+```bash
+$ npm i --save @cubejs-client/core
+$ npm i --save @cubejs-client/vue
+```
+
 ### Example Usage
 
 #### Vanilla Javascript
@@ -175,3 +182,72 @@ export default () => {
   )
 }
 ```
+
+#### Vue
+Import `cubejs` and `QueryRenderer` components, and use them to fetch the data.
+In the example below we use Vue-Chartkick to visualize data.
+
+```jsx
+<template>
+  <div class="hello">
+    <query-renderer :cubejs-api="cubejsApi" :query="query">
+      <template v-slot="{ measures, resultSet, loading }">
+        <line-chart :data="transformData(resultSet)"></line-chart>
+      </template>
+    </query-renderer>
+  </div>
+</template>
+
+<script>
+import cubejs from '@cubejs-client/core';
+import { QueryBuilder } from '@cubejs-client/vue';
+import Vue from 'vue';
+import VueChartkick from 'vue-chartkick';
+import Chart from 'chart.js';
+
+Vue.use(VueChartkick, { adapter: Chart });
+
+const cubejsApi = cubejs(
+  'YOUR-CUBEJS-API-TOKEN',
+  { apiUrl: 'http://localhost:4000/cubejs-api/v1' },
+);
+
+export default {
+  name: 'HelloWorld',
+  components: {
+    QueryBuilder,
+  },
+  props: {
+    msg: String,
+  },
+  data() {
+    const query = {
+      measures: ['LineItems.count', 'LineItems.quantity', 'Orders.count'],
+      timeDimensions: [
+        {
+          dimension: 'LineItems.createdAt',
+          granularity: 'month',
+        },
+      ],
+    };
+
+    return {
+      cubejsApi,
+      query,
+    };
+  },
+  methods: {
+    transformData(resultSet) {
+      const seriesNames = resultSet.seriesNames();
+      const pivot = resultSet.chartPivot();
+      const series = [];
+      seriesNames.forEach((e) => {
+        const data = pivot.map(p => [p.x, p[e.key]]);
+        series.push({ name: e.key, data });
+      });
+      return series;
+    },
+  },
+};
+</script>
+```

examples/vue-dashboard/backend/.env

@@ -0,0 +1,3 @@
+CUBEJS_API_SECRET=SECRET
+CUBEJS_DB_TYPE=postgres
+CUBEJS_DB_NAME=ecom

examples/vue-dashboard/backend/index.js

@@ -0,0 +1,7 @@
+const CubejsServer = require('@cubejs-backend/server');
+
+const server = new CubejsServer();
+
+server.listen().then(({ port }) => {
+  console.log(`🚀 Cube.js server is listening on ${port}`);
+});

examples/vue-dashboard/backend/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "backend",
+  "version": "0.0.1",
+  "private": true,
+  "scripts": {
+    "dev": "./node_modules/.bin/cubejs-dev-server"
+  },
+  "dependencies": {
+    "@cubejs-backend/postgres-driver": "^0.4.4",
+    "@cubejs-backend/server": "^0.4.6"
+  }
+}

examples/vue-dashboard/backend/schema/LineItems.js

@@ -0,0 +1,40 @@
+cube(`LineItems`, {
+  sql: `SELECT * FROM public.line_items`,
+
+  joins: {
+    Orders: {
+      sql: `${CUBE}.order_id = ${Orders}.id`,
+      relationship: `belongsTo`
+    }
+  },
+
+  measures: {
+    count: {
+      type: `count`,
+      drillMembers: [id, createdAt]
+    },
+
+    quantity: {
+      sql: `quantity`,
+      type: `sum`
+    },
+
+    price: {
+      sql: `price`,
+      type: `sum`
+    }
+  },
+
+  dimensions: {
+    id: {
+      sql: `id`,
+      type: `number`,
+      primaryKey: true
+    },
+
+    createdAt: {
+      sql: `created_at`,
+      type: `time`
+    }
+  }
+});

examples/vue-dashboard/backend/schema/Orders.js

@@ -0,0 +1,45 @@
+cube(`Orders`, {
+  sql: `SELECT * FROM public.orders`,
+
+  joins: {
+    Users: {
+      sql: `${CUBE}.user_id = ${Users}.id`,
+      relationship: `belongsTo`
+    }
+  },
+
+  measures: {
+    count: {
+      type: `count`,
+      drillMembers: [id, createdAt]
+    },
+
+    number: {
+      sql: `number`,
+      type: `sum`
+    }
+  },
+
+  dimensions: {
+    id: {
+      sql: `id`,
+      type: `number`,
+      primaryKey: true
+    },
+
+    status: {
+      sql: `status`,
+      type: `string`
+    },
+
+    createdAt: {
+      sql: `created_at`,
+      type: `time`
+    },
+
+    completedAt: {
+      sql: `completed_at`,
+      type: `time`
+    }
+  }
+});

examples/vue-dashboard/backend/schema/Users.js

@@ -0,0 +1,42 @@
+cube(`Users`, {
+  sql: `SELECT * FROM public.users`,
+
+  joins: {
+
+  },
+
+  measures: {
+    count: {
+      type: `count`,
+      drillMembers: [city, id, createdAt]
+    }
+  },
+
+  dimensions: {
+    city: {
+      sql: `city`,
+      type: `string`
+    },
+
+    gender: {
+      sql: `gender`,
+      type: `string`
+    },
+
+    id: {
+      sql: `id`,
+      type: `number`,
+      primaryKey: true
+    },
+
+    company: {
+      sql: `company`,
+      type: `string`
+    },
+
+    createdAt: {
+      sql: `created_at`,
+      type: `time`
+    }
+  }
+});

examples/vue-dashboard/frontend/.env.development

@@ -0,0 +1,2 @@
+REACT_APP_CUBEJS_TOKEN=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE1NTM3NjIwNzIsImV4cCI6MTU1Mzg0ODQ3Mn0.zwBj40GgBSwGc72RYo2_6PeOnHMNo7AYummdYGJkiDo
+REACT_APP_API_URL=http://localhost:4000/cubejs-api/v1

examples/vue-dashboard/frontend/.env.production

@@ -0,0 +1,2 @@
+REACT_APP_CUBEJS_TOKEN=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.e30.K9PiJkjegbhnw4Ca5pPlkTmZihoOm42w8bja9Qs2qJg
+REACT_APP_API_URL=https://react-query-builder.herokuapp.com/cubejs-api/v1

examples/vue-dashboard/frontend/.gitignore

@@ -0,0 +1,23 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*