https://github.com/techgaun/elixir-tips-tricks

Just random tips and tricks while working with elixir [& phoenix and other libs/frameworks]
https://github.com/techgaun/elixir-tips-tricks

elixir elixir-tips erlang phoenix

Last synced: 20 days ago
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Just random tips and tricks while working with elixir [& phoenix and other libs/frameworks]

• Host: GitHub
• URL: https://github.com/techgaun/elixir-tips-tricks
• Owner: techgaun
• License: mit
• Created: 2016-04-25T15:51:38.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2016-09-04T01:01:45.000Z (over 8 years ago)
• Last Synced: 2024-10-31T12:14:12.259Z (2 months ago)
• Topics: elixir, elixir-tips, erlang, phoenix
• Size: 4.88 KB
• Stars: 1
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# elixir-tips-tricks

Just random tips and tricks while working with elixir [& phoenix and other libs/frameworks]

### Disable compiling of dependency in mix

```

{:my_dep, …, compile: false}

```

### Run only particular tests

Use `@tag :wip` in the test you want to run

```

defmodule MyTest do

  use ExUnit.Case

  

  test "first test" do

    assert 1 == 1

  end

  

  @tag :wip

  test "second test" do

    assert 3 != 5

  end

end

```

```

mix test --only wip

```

### Build composable queries with Inquisitor

Check the [Inquisitor](https://github.com/DockYard/inquisitor) repository if you're looking for building composable queries for Ecto.

### iex shortcuts

- c "somefile.exs" - compile the file

- r SomeModule - reload the module

- h some_func - get help for the function

- v [n] - access session history

### Get query and post params excluding others in params (phoenix)

```

conn.body_params # gives params from POST

conn.query_params # query string parameters

```

### Run multiple mix tasks

```

MIX_ENV=test mix do deps.get, test

```

### Update particular dependency

```

mix deps.update 

```

### Turn off layout on Phoenix.Controller.render/3

```

render conn, "index.html", %{layout: false}

# with plug

plug :put_layout, false

# pipe it

conn |> put_layout(false) |> render(...)

```

### Increase stacktrace

```

:erlang.system_flag(:backtrace_depth, 20)

# with phoenix

# config/env.exs

config :phoenix, :stacktrace_depth, 20

```

### Observer on remote erlang node

```

$ iex --name [email protected] --cookie iam_not_so_awesome -S mix phoenix.server  # in api server

# on separate shell

$ iex --name [email protected] --remsh [email protected] --cookie iam_not_so_awesome

iex([email protected])1> :observer.start

```

You can pass args down to erlang via `erl` flag.

Example: `--erl "-kernel inet_dist_listen_min 9001 inet_dist_listen_m 9001"`

### Change default compile output directory

Based on [this](https://github.com/elixir-lang/elixir/blob/4e648199f18ee3be8addab82c951b9e2dd82f885/lib/mix/lib/mix/tasks/new.ex#L286), you can specify a keyword list arg `build_path` to override the default `_build` directory.

Example:

    def project do

        [app: :my_app,

        version: "0.0.1",

        elixir: "~> 1.2",

        build_embedded: Mix.env == :prod,

        start_permanent: Mix.env == :prod,

        build_path: "custom_build_dir",

        deps: deps]

    end

### Emmet tab support for eex in Atom

Open your preferences and select keymaps. It should open keymaps.cson. Add the following in that file:

```coffeescript

'atom-text-editor[data-grammar="text html elixir"]:not([mini])':

    'tab': 'emmet:expand-abbreviation-with-tab'

```

The grammar can be obtained for any files by opening console (ctrl+shift+i) and type the following with the appropriate file open in your editor:

```javascript

document.getElementsByTagName('atom-text-editor')

```