Order child pages (#21)

* save ordering pages

* move to another collection

* requested changes. Code improvements

* add margin

* unit tests

* fix

* requested changes

* recursive method: create menu tree

* update comments

* fix bug

* requested changes

* move const

* fix error message on catch

* add migration

* rewrite to splices

* move methods

* testing put above method

* linter fix

test/models/pageOrder.js

@@ -0,0 +1,143 @@
+const {expect} = require('chai');
+const fs = require('fs');
+const path = require('path');
+const config = require('../../config');
+const PageOrder = require('../../src/models/pageOrder');
+const {pagesOrder} = require('../../src/utils/database');
+
+describe('PageOrder model', () => {
+  after(() => {
+    const pathToDB = path.resolve(__dirname, '../../', config.database, './pages.db');
+
+    if (fs.existsSync(pathToDB)) {
+      fs.unlinkSync(pathToDB);
+    }
+  });
+
+  it('Empty Model', async () => {
+    let pageOrder = new PageOrder();
+
+    expect(pageOrder.data).to.be.a('object');
+
+    let {data} = pageOrder;
+
+    expect(data._id).to.be.undefined;
+    expect(data.page).to.be.to.equal('0');
+    expect(data.order).to.be.an('array').that.is.empty;
+
+    page = new PageOrder(null);
+
+    data = page.data;
+
+    expect(data._id).to.be.undefined;
+    expect(data.page).to.be.to.equal('0');
+    expect(data.order).to.be.an('array').that.is.empty;
+
+    const testData = {
+      _id: 'order_id',
+      page: 'page_id',
+      order: []
+    };
+
+    page = new PageOrder(testData);
+    data = page.data;
+
+    expect(data._id).to.equal(testData._id);
+    expect(data.page).to.equal(testData.page);
+    expect(data.order).to.be.an('array').that.is.empty;
+  });
+
+  it('Testing Model methods', async () => {
+    const testData = {
+      page: 'page_id',
+      order: ['1', '2']
+    };
+    const pageOrder = new PageOrder(testData);
+    let {data} = await pageOrder.save();
+
+    expect(data._id).not.be.undefined;
+    expect(data.page).to.equal(testData.page);
+    expect(data.order).to.deep.equals(testData.order);
+
+    const insertedPageOrder = await pagesOrder.findOne({_id: data._id});
+    expect(insertedPageOrder._id).to.equal(data._id);
+    expect(insertedPageOrder.page).to.equal(data.page);
+    expect(insertedPageOrder.order).to.deep.equal(data.order);
+
+    const updateData = {
+      page: 'page_id_2',
+      order: ['3']
+    };
+
+    pageOrder.data = updateData;
+    await pageOrder.save();
+
+    expect(pageOrder.data._id).to.equal(insertedPageOrder._id);
+
+    const updatedData = await pagesOrder.findOne({_id: insertedPageOrder._id});
+
+    expect(updatedData.page).to.equal(updateData.page);
+    expect(updatedData.order).to.deep.equal(updateData.order);
+
+    await pageOrder.destroy();
+
+    expect(pageOrder.data._id).to.be.undefined;
+
+    const removedPage = await pagesOrder.findOne({_id: updatedData._id});
+
+    expect(removedPage).to.be.null;
+  });
+
+  it('Testing push and remove order methods', async () => {
+    const testData = {
+      page: 'page_id',
+      order: ['1', '2']
+    };
+    const pageOrder = new PageOrder(testData);
+    await pageOrder.save();
+    pageOrder.push('3');
+    expect(pageOrder.data.order).to.be.an('array').that.is.not.empty;
+    pageOrder.data.order.forEach((el) => {
+      expect(el).to.be.an('string')
+    });
+
+    expect(pageOrder.data.order).to.deep.equals(['1', '2', '3']);
+
+    pageOrder.remove('2');
+    expect(pageOrder.data.order).to.deep.equals(['1', '3']);
+
+    expect(() => {
+      pageOrder.push(3);
+    }).to.throw('given id is not string');
+
+    pageOrder.push('4');
+    pageOrder.push('5');
+    pageOrder.push('2');
+
+    pageOrder.putAbove('2', '3');
+    expect(pageOrder.data.order).to.deep.equals(['1', '2', '3', '4', '5']);
+
+    pageOrder.putAbove('2', '10');
+    expect(pageOrder.data.order).to.deep.equals(['1', '2', '3', '4', '5']);
+    await pageOrder.destroy();
+  });
+
+  it('Testing static methods', async () => {
+    const testData = {
+      page: 'page_id',
+      order: ['1', '2']
+    };
+    const pageOrder = new PageOrder(testData);
+    const insertedData = await pageOrder.save();
+
+    const insertedPageOrder = await PageOrder.get(insertedData.data.page);
+    expect(insertedPageOrder).to.instanceOf(PageOrder);
+    expect(insertedPageOrder.data._id).to.be.equal(insertedData.data._id);
+
+    const emptyInstance = await PageOrder.get(null);
+    expect(emptyInstance.data.page).to.be.equal('0');
+    expect(emptyInstance.data.order).to.be.an('array').that.is.empty;
+
+    await pageOrder.destroy();
+  });
+});