Laravel - Dropping foreign key and adding in one migration - php

Question

I am trying to drop the foreign key and add the foreign key in one migration but can't get it to work:
I have created the table contents with the foreign key cms_id:
public function up()
{
Schema::create('contents', function (Blueprint $table) {
$table->increments('id');
$table->integer('ct_id')->unsigned();
$table->foreign('ct_id')->references('id')->on('content_types');
$table->integer('cms_id')->unsigned();
$table->foreign('cms_id')->references('id')->on('inventories');
$table->string('title');
$table->string('slug');
$table->text('excerpt');
$table->mediumText('body');
$table->string('password');
$table->integer('parent_id');
$table->timestamps();
});
}
This is how the inventories table looks like:
Schema::create('inventories', function (Blueprint $table) {
$table->increments('id');
$table->integer('remote_id');
$table->integer('local_id')->unsigned();
$table->string('local_type');
$table->timestamps();
});
And after failing to drop it and to create a new foreign key, I have deleted all the tables in the DB, and have tried to run all the migrations again with the new one as well, which holds this:
public function up()
{
Schema::table('inventories', function (Blueprint $table) {
$table->integer('remote_id')->unsigned()->change();
});
Schema::table('contents', function (Blueprint $table) {
$table->dropForeign('contents_cms_id_foreign');
$table->foreign('cms_id')->references('remote_id')->on('inventories');
});
Schema::table('files', function (Blueprint $table) {
$table->dropForeign('files_cms_id_foreign');
$table->foreign('cms_id')->references('remote_id')->on('inventories');
});
}
But,I get:
[Illuminate\Database\QueryException]
SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint
(SQL : alter table contents add constraint
contents_cms_id_foreign foreign k ey (cms_id) references
inventories (remote_id))
[PDOException]
SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint
If, I first run all the migrations where I create all the tables, and then after that run the new migration where I change the foreign keys, I get this error:
[Illuminate\Database\QueryException]
SQLSTATE[42000]: Syntax error or access violation: 1091 Can't DROP
'content s_cms_id_foreign'; check that column/key exists (SQL:
alter table contents drop foreign key
contents_cms_id_foreign)
[PDOException]
SQLSTATE[42000]: Syntax error or access violation: 1091 Can't DROP
'content s_cms_id_foreign'; check that column/key exists
I have even tried to just delete all the tables in the DB, and only edit the files that I already have by just changing, without new migrations:
$table->integer('ct_id')->unsigned();
$table->foreign('ct_id')->references('remote_id')->on('content_types');
$table->integer('cms_id')->unsigned();
$table->foreign('cms_id')->references('remote_id')->on('inventories');
And, also in the inventories table:
$table->integer('remote_id')->unsigned();
But, even then it won't work, and I get:
[Illuminate\Database\QueryException]
SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint
(SQL : alter table contents add constraint
contents_cms_id_foreign foreign k ey (cms_id) references
inventories (remote_id))
[PDOException]
SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint
So, I have checked all of the usual suspects that I have come across on the internet, I have even added $table->engine = 'InnoDB'; to to the tables inventories, contents and files, I have made sure to first create tables and then add foreign keys, as well as checked if the columns have the same data type, not sure what to do else?