Filter support

[wisepotato]

I would love to be able to filter the queries sent to the api. A very basic example would include support for the following: JsonApitDotNetCore. Which would include the following:

?filter[attribute]=eq:value
?filter[attribute]=ne:value
?filter[attribute]=lt:value
?filter[attribute]=gt:value
?filter[attribute]=le:value
?filter[attribute]=ge:value
?filter[attribute]=like:value
?filter[attribute]=in:value

[maurei]

You can now implement this yourself by doing something like

@Model() {

	...
	...
	...

	public static async filter(attr: string, val: string) {
	    const params = new HttpHeaders().set(`filter[${attr}]=${val}');
	    return await this.fetch({params: params})
	} 
	
}

Adding such functionality out of the box would def be a nice idea

[wisepotato]

I would suggest a class to import that handles all filter[x]=y requests. Like an adapter type. Or use the regular sql-like syntactic sugar like linq and give a standard implementation

[maurei]

A more explicit proposal would be welcome. E.g. some code samples of how the usage would be, and/or some pointers on how to implement.