### YAML Inheritance Structure Example

Source: https://github.com/magynhard/yaml_extend/blob/master/README.md

Illustrates common inheritance patterns in YAML configuration files using the 'extends:' key.

```yaml
defaults.yml   
    \        \
     dev.yml  int.yml  prod.yml                   
```

```yaml
fruits.yml   vegetables.yml          default.yml   extensions.yml       
             \    /                             \    /
              food.yml                          merged.yml
                                              |
                                            another_extended.yml
```

--------------------------------

### Install yaml_extend via Command Line

Source: https://github.com/magynhard/yaml_extend/blob/master/README.md

Install the gem directly using the gem install command for command-line usage.

```bash
gem install yaml_extend
```

--------------------------------

### Install yaml_extend Gem

Source: https://github.com/magynhard/yaml_extend/blob/master/README.md

Add the gem to your application's Gemfile and run bundle install.

```ruby
gem 'yaml_extend'
```

--------------------------------

### Using Custom Extend Key (Parameter)

Source: https://github.com/magynhard/yaml_extend/blob/master/README.md

Specify a custom key for inheritance by passing it as a parameter to `ext_load_file`. This is useful for one-off custom key usage.

```yaml
#custom1.yml
inherit_from:
    - 'super_file.yml'
foo: 'bar'
...

```

```ruby
config = YAML.ext_load_file 'custom1.yml', 'inherit_from'
```

--------------------------------

### Basic YAML Inheritance

Source: https://github.com/magynhard/yaml_extend/blob/master/README.md

Demonstrates basic YAML inheritance using 'extends' and ERB templating. The 'start.erb.yml' file extends 'super.yml', merging their data.

```yaml
# start.erb.yml
extends: 'super.yml'
data:
    name: 'Mr. Superman'
    age: 134
    # using ERB templating with ruby code 
    foo: '<%= 'bar' %>'
    favorites:
        - 'Raspberrys'
```

```yaml
# super.yml
data:
    name: 'Unknown'
    power: 2000
    favorites:
        - 'Bananas'
        - 'Apples'
```

```ruby
config = YAML.ext_load_file 'start.erb.yml'
```

```yaml
data:
    name: 'Mr. Superman'
    age: 134
    foo: 'bar'
    power: 2000
    favorites:
        - 'Bananas'
        - 'Apples'
        - 'Raspberrys'
```

--------------------------------

### Run yaml_extend from Command Line

Source: https://github.com/magynhard/yaml_extend/blob/master/README.md

Execute yaml_extend to parse and merge a YAML file. The output can be redirected to a file.

```bash
yaml_extend path/to/my/yaml_file.yml
```

```bash
yaml_extend path/to/my/yaml_file.yml > combined_yaml.yml
```

--------------------------------

### Load YAML File with Inheritance in Ruby

Source: https://github.com/magynhard/yaml_extend/blob/master/README.md

Use YAML.ext_load_file to load and merge YAML files, supporting inheritance. The inheritance_key is removed by default from the final output. Custom options can be passed to control merging behavior, including deep merge options.

```ruby
YAML.ext_load_file(yaml_path, inheritance_key='extends', options = {})
```

--------------------------------

### Global Configuration of Custom Extend Key

Source: https://github.com/magynhard/yaml_extend/blob/master/README.md

Set a custom inheritance key globally by assigning it to `YAML.ext_load_key`. This avoids needing to specify the key as a parameter for every call.

```ruby
YAML.ext_load_key = 'inherit_from'
config = YAML.ext_load_file 'custom1.yml'
```

--------------------------------

### Using Custom Nested Extend Key

Source: https://github.com/magynhard/yaml_extend/blob/master/README.md

Specify a custom extend key that is nested within the YAML structure by providing an array of keys to `ext_load_file`.

```yaml
#custom2.yml
options:
    extend_file: 'super_file.yml'
    database: false
foo: 'bar'
...

```

```ruby
config = YAML.ext_load_file 'custom2.yml', ['options','extend_file']
```

--------------------------------

### Inherit from Several YAML Files

Source: https://github.com/magynhard/yaml_extend/blob/master/README.md

Specify a list of files in the 'extends' key to inherit from multiple YAML files. Files are merged from top to bottom, with later files overwriting earlier ones.

```yaml
extends:
    - 'super_file.yml'
    - 'parent_file.yml'
...

```

--------------------------------

### Reset Global Custom Extend Key

Source: https://github.com/magynhard/yaml_extend/blob/master/README.md

Reset the globally configured inheritance key using `YAML.reset_load_key` or by setting `YAML.ext_load_key` to nil.

```ruby
YAML.reset_load_key # more readable
YAML.ext_load_key = nil # more explicit
```

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