feat(repository): delete operation in hasOne relation and example hasOne

implemeted delete new feature on hasone relation. created an example of one to one application into
examples folder

"fix loopbackio#2233"

examples/one-2-one/.gitignore

@@ -0,0 +1,64 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# Generated apidocs
+api-docs/
+
+# Transpiled JavaScript files from Typescript
+/dist

examples/one-2-one/.npmrc

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+package-lock=false

examples/one-2-one/.prettierignore

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+dist
+*.json

examples/one-2-one/.prettierrc

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+{
+  "bracketSpacing": false,
+  "singleQuote": true,
+  "printWidth": 80,
+  "trailingComma": "all"
+}

examples/one-2-one/.vscode/settings.json

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+{
+  "editor.rulers": [80],
+  "editor.tabCompletion": "on",
+  "editor.tabSize": 2,
+  "editor.trimAutoWhitespace": true,
+  "editor.formatOnSave": true,
+
+  "files.exclude": {
+    "**/.DS_Store": true,
+    "**/.git": true,
+    "**/.hg": true,
+    "**/.svn": true,
+    "**/CVS": true,
+    "dist": true,
+  },
+  "files.insertFinalNewline": true,
+  "files.trimTrailingWhitespace": true,
+
+  "tslint.ignoreDefinitionFiles": true,
+  "typescript.tsdk": "./node_modules/typescript/lib"
+}

examples/one-2-one/.vscode/tasks.json

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+{
+  // See https://go.microsoft.com/fwlink/?LinkId=733558
+  // for the documentation about the tasks.json format
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "Watch and Compile Project",
+      "type": "shell",
+      "command": "npm",
+      "args": ["--silent", "run", "build:watch"],
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "problemMatcher": "$tsc-watch"
+    },
+    {
+      "label": "Build, Test and Lint",
+      "type": "shell",
+      "command": "npm",
+      "args": ["--silent", "run", "test:dev"],
+      "group": {
+        "kind": "test",
+        "isDefault": true
+      },
+      "problemMatcher": ["$tsc", "$tslint5"]
+    }
+  ]
+}

examples/one-2-one/.yo-rc.json

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+{}

examples/one-2-one/DEVELOPING.md

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+# Developer's Guide
+
+We use Visual Studio Code for developing LoopBack and recommend the same to our
+users.
+
+## VSCode setup
+
+Install the following extensions:
+
+- [tslint](https://marketplace.visualstudio.com/items?itemName=eg2.tslint)
+- [prettier](https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode)
+
+## Development workflow
+
+### Visual Studio Code
+
+1. Start the build task (Cmd+Shift+B) to run TypeScript compiler in the
+   background, watching and recompiling files as you change them. Compilation
+   errors will be shown in the VSCode's "PROBLEMS" window.
+
+2. Execute "Run Rest Task" from the Command Palette (Cmd+Shift+P) to re-run the
+   test suite and lint the code for both programming and style errors. Linting
+   errors will be shown in VSCode's "PROBLEMS" window. Failed tests are printed
+   to terminal output only.
+
+### Other editors/IDEs
+
+1. Open a new terminal window/tab and start the continous build process via
+   `npm run build:watch`. It will run TypeScript compiler in watch mode,
+   recompiling files as you change them. Any compilation errors will be printed
+   to the terminal.
+
+2. In your main terminal window/tab, run `npm run test:dev` to re-run the test
+   suite and lint the code for both programming and style errors. You should run
+   this command manually whenever you have new changes to test. Test failures
+   and linter errors will be printed to the terminal.

examples/one-2-one/README.md

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+# one2one
+
+[![LoopBack](<https://github.com/strongloop/loopback-next/raw/master/docs/site/imgs/branding/Powered-by-LoopBack-Badge-(blue)[email protected]>)](http://loopback.io/)

examples/one-2-one/data/data.json

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+{
+  "ids": {
+    "Supplier": 3,
+    "Account": 6
+  },
+  "models": {
+    "Supplier": {
+      "one": "{\"id\":\"one\",\"name\":\"Raphael\"}",
+      "two": "{\"id\":\"two\",\"name\":\"Drai\"}"
+    },
+    "Account": {
+      "no-relation": "{\"id\":\"no-relation\",\"accountManager\":\"Unknown Manager\"}",
+      "ac-1": "{\"id\":\"ac-1\",\"accountManager\":\"RaphaelDraiManager\",\"supplierId\":\"one\"}",
+      "ac-2": "{\"id\":\"ac-2\",\"accountManager\":\"Flora\",\"supplierId\":\"two\"}"
+    }
+  }
+}

examples/one-2-one/index.js

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+const application = require('./dist');
+
+module.exports = application;
+
+if (require.main === module) {
+  // Run the application
+  const config = {
+    rest: {
+      port: +process.env.PORT || 3000,
+      host: process.env.HOST || '10.240.105.240' || 'localhost',
+      openApiSpec: {
+        // useful when used with OASGraph to locate your application
+        setServersFromRequest: true,
+      },
+    },
+  };
+  application.main(config).catch(err => {
+    console.error('Cannot start the application.', err);
+    process.exit(1);
+  });
+}

examples/one-2-one/index.ts

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+export * from './src';

examples/one-2-one/package.json

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+{
+  "name": "@loopback/example-one-2-one",
+  "version": "1.3.1",
+  "description": "Continuation of the hasOne example using relations in LoopBack 4.",
+  "main": "index.js",
+  "engines": {
+    "node": ">=8.9"
+  },
+  "scripts": {
+    "build:apidocs": "lb-apidocs",
+    "build": "lb-tsc es2017 --outDir dist",
+    "build:watch": "lb-tsc es2017 --outDir dist --watch",
+    "clean": "lb-clean *example-one-2-one*.tgz dist package api-docs",
+    "lint": "npm run prettier:check && npm run tslint",
+    "lint:fix": "npm run tslint:fix && npm run prettier:fix",
+    "prettier:cli": "lb-prettier \"**/*.ts\"",
+    "prettier:check": "npm run prettier:cli -- -l",
+    "prettier:fix": "npm run prettier:cli -- --write",
+    "tslint": "lb-tslint",
+    "tslint:fix": "npm run tslint -- --fix",
+    "pretest": "npm run build",
+    "test": "lb-mocha \"dist/test/*/**/*.js\"",
+    "test:dev": "lb-mocha --allow-console-logs dist/test/**/*.js && npm run posttest",
+    "verify": "npm pack && tar xf loopback-todo-list*.tgz && tree package && npm run clean",
+    "migrate": "node ./dist/src/migrate",
+    "prestart": "npm run build",
+    "start": "node ."
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/strongloop/loopback-next.git"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "@loopback/boot": "^1.0.8",
+    "@loopback/context": "^1.4.0",
+    "@loopback/core": "^1.1.3",
+    "@loopback/openapi-v3": "^1.1.5",
+    "@loopback/openapi-v3-types": "^1.0.3",
+    "@loopback/repository": "^1.1.1",
+    "@loopback/rest": "^1.5.1",
+    "@loopback/rest-explorer": "^1.1.4",
+    "@loopback/service-proxy": "^1.0.5",
+    "loopback-connector-rest": "^3.1.1"
+  },
+  "devDependencies": {
+    "@loopback/build": "^1.1.0",
+    "@loopback/http-caching-proxy": "^1.0.3",
+    "@loopback/testlab": "^1.0.3",
+    "@loopback/tslint-config": "^1.0.0",
+    "@types/lodash": "^4.14.109",
+    "@types/node": "^10.11.2",
+    "lodash": "^4.17.10",
+    "tslint": "^5.12.0",
+    "typescript": "^3.2.2"
+  },
+  "keywords": [
+    "loopback",
+    "LoopBack",
+    "example",
+    "tutorial",
+    "relations",
+    "CRUD",
+    "models",
+    "account",
+    "HasOne"
+  ]
+}

examples/one-2-one/public/index.html

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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <title>hasOne relation example between supplier and account</title>
+
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="shortcut icon" type="image/x-icon" href="//v4.loopback.io/favicon.ico">
+
+  <style>
+    h3 {
+      margin-left: 25px;
+      text-align: center;
+    }
+
+    a, a:visited {
+      color: #3f5dff;
+    }
+
+    h3 a {
+      margin-left: 10px;
+    }
+
+    a:hover, a:focus, a:active {
+      color: #001956;
+    }
+
+    .power {
+      position: absolute;
+      bottom: 25px;
+      left: 50%;
+      transform: translateX(-50%);
+    }
+
+    .info {
+      position: absolute;
+      top: 50%;
+      left: 50%;
+      transform: translate(-50%, -50%)
+    }
+
+    .info h1 {
+      text-align: center;
+      margin-bottom: 0;
+    }
+
+    .info p {
+      text-align: center;
+      margin-bottom: 3em;
+      margin-top: 1em;
+    }
+  </style>
+</head>
+
+<body>
+  <div class="info">
+    <h1>one2one</h1>
+    <p>Version 1.0.0</p>
+
+    <h3>OpenAPI spec: <a href="/openapi.json">/openapi.json</a></h3>
+    <h3>API Explorer: <a href="/explorer">/explorer</a></h3>
+  </div>
+
+  <footer class="power">
+    <a href="https://v4.loopback.io" target="_blank">
+      <img src="https://loopback.io/images/branding/powered-by-loopback/blue/powered-by-loopback-sm.png" />
+    </a>
+  </footer>
+</body>
+
+</html>