Adds an optional metadata to fields

[anujmiddha]

We might need to add certain metadata with each field. This pull request adds this support.

For example, we can add description with different fields, which can be shown on the admin page for updating the fields.

field :host, default: "http://example.com", validates: { presence: true }, metadata: { description: "Host url" }

[anujmiddha]

210 Adds support for metadata

[huacnlee]

Version 2.7.x has allows you to add any options for field.

https://github.com/huacnlee/rails-settings-cached/releases/tag/v2.7.0

class Setting
  field :my_key, type: :string, description: "Hello world", placeholder: "My key"
end

And the you can use get_field to get description

field = Setting.get_field("my_key")
field[:options]
=> { description: "Hello world", placeholder: "My key" }