Some Sequelize commands don't return anything (or at least not anything useful) by default. Sequelize uses an option called returning to specify which data returns from a commands like .destroy() or update().
Let's look at three common Sequelize commands and see how to handle the data returned by each.
By default, .create() returns the newly created instance. This is convenient, because we can then send data to the user:
When querying your database in Sequelize, you'll often want data associated with a particular model which isn't in the model's table directly. This data is usually typically associated through join tables (e.g. a 'hasMany' or 'belongsToMany' association), or a foreign key (e.g. a 'hasOne' or 'belongsTo' association).
When you query, you'll receive just the rows you've looked for. With eager loading, you'll also get any associated data. For some reason, I can never remember the proper way to do eager loading when writing my Sequelize queries. I've seen others struggle with the same thing.
Eager loading is confusing because the 'include' that is uses has unfamiliar fields is set in an array rather than just an object.
So let's go through the one query that's worth memorizing to handle your eager loading.
| --- | |
| METHOD 1 | |
| This should roughly sort the items on distance in MySQL, and should work in SQLite. | |
| If you need to sort them preciser, you could try using the Pythagorean theorem (a^2 + b^2 = c^2) to get the exact distance. | |
| --- | |
| SELECT * | |
| FROM table | |
| ORDER BY ((lat-$user_lat)*(lat-$user_lat)) + ((lng - $user_lng)*(lng - $user_lng)) ASC |
| <!-- What our app will be rendered into --> | |
| <div id="app"></div> |
| preferred_syntax = :scss | |
| http_path = '/' | |
| css_dir = 'assets/css' | |
| sass_dir = 'assets/scss' | |
| images_dir = 'assets/images' | |
| javascripts_dir = 'assets/js' | |
| relative_assets = true | |
| line_comments = true | |
| # output_style = :compressed |
| 56546 |
| qwewqewqe |
| # Your init script | |
| # | |
| # Atom will evaluate this file each time a new window is opened. It is run | |
| # after packages are loaded/activated and after the previous editor state | |
| # has been restored. | |
| # | |
| # An example hack to log to the console when each text editor is saved. | |
| # | |
| # atom.workspace.observeTextEditors (editor) -> | |
| # editor.onDidSave -> |
| { | |
| "vars": { | |
| "@gray-base": "#000", | |
| "@gray-darker": "lighten(@gray-base, 13.5%)", | |
| "@gray-dark": "lighten(@gray-base, 20%)", | |
| "@gray": "lighten(@gray-base, 33.5%)", | |
| "@gray-light": "lighten(@gray-base, 46.7%)", | |
| "@gray-lighter": "lighten(@gray-base, 93.5%)", | |
| "@brand-primary": "darken(#428bca, 6.5%)", | |
| "@brand-success": "#5cb85c", |