Prepare the YAML configuration files for Symfony 3

[javiereguiluz]

I'm trying to make this demo app work with Symfony 3. Right now it's impossible because KnpPaginatorBundle is not compatible with 3. However, I managed to make it work somehow and I'm seeing these deprecation errors:

The file "app/config/services.yml" does not contain valid YAML.

The reserved indicator "@" cannot start a plain scalar; you need to
quote the scalar at line 16 (near "arguments: [@markdown, %app_locales%]").

In services.yml we need to wrap with quotes any string that starts with @ or %. If you want to submit a pull request to solve this issue, please use single quotes instead of double quotes. Thanks!

[javiereguiluz]

The same errors happen in src/CodeExplorerBundle/DependencyInjection/../Resources/config/services.yml file.

[javiereguiluz]

And the same errors happen in app/config/routing.yml

[bocharsky-bw]

@javiereguiluz Are there any reasons to use single quotes in this case?

[javiereguiluz]

@bocharsky-bw no technical reason. It's for consistency with the rest of the Symfony ecosystem, which has decided to use single quotes to escape these chars in YAML files.

[stof]

using single quotes is easier than double quotes IMO: double quotes in Yaml require to escape many chars in the string, while single quotes only need to escape single quotes themselves (by doubling them)

[bocharsky-bw]

Useful to know, thanks!

[georgiana-gligor]

Resurrecting this one from the dead, as I fought it a little bit today.
The solution that worked in my case is based on @stof 's suggestion:

        type:
            type: string
            nullable: false
            length: 255
            options:
                fixed: false
            column: '`type`' # << note the single quote AND backtick

Hope it helps someone gain time.