[5.2] Enable or disable Foreign Key Constraints

[srmklive]

This PR allows user to enable/disable foreign key checks dynamically. As mentioned in issue #2502, we need to utilize the DB facade to write queries in this regard. This PR removes that constraint.

To enable/disable foreign key checks while creating migrations:

// Disable foreign key checks
Schema::disableForeignKeyConstraints();

// Enable foreign key checks
Schema::enableForeignKeyConstraints();

[srmklive]

@taylorotwell Can i send these changes over to 5.1 as well?

[GrahamCampbell]

No, sorry. This is not a bug fix, so we don't merge it back.

[GrahamCampbell]

LTS is there so people can continue using it knowing it'll be secure more than anything else. For the latest features, you need to be tracking the current stable.

[srmklive]

@GrahamCampbell thanks for pointing it out. Will follow the guidelines you mentioned.

[rtucek]

Hi,
the PR of the documentation (laravel/docs#2294) has been merged and published too early.
Either it should be temporary reversed or this PR will be released shortly. It's confusing the way it is right now :/

[abrahamgreyson]

That's fantastic.

[Mixpeal]

it works, thanks