Implement get shows by filtering slugs

We should expand the get shows endpoint to filter Category, FundingCategory, Language, MusicFocus, Topic and Type by its slug:

We will research about the best option for this.

Either accept the both types of parameter:

GET /api/v1/shows/?category=<int|slug>
GET /api/v1/shows/?funding_category=<int|slug>
GET /api/v1/shows/?language=<int|slug>
GET /api/v1/shows/?music_focus=<int|slug>
GET /api/v1/shows/?topic=<int|slug>
GET /api/v1/shows/?type=<int|slug>

Or, be explicit about the type of the parameter:

GET /api/v1/shows/?category_pk=<int>
GET /api/v1/shows/?category_slug=<slug>
...

added To Do label

assigned to @nnrcschmdt

changed milestone to %1.0-alpha2 — Precise Pheasant

changed title from Implement filter by slug to Implement get shows by filtering slugs

changed the description

added discuss label

marked this issue as related to #75 (closed)

Discussed with @nnrcschmdt today:

• Relates to #75 (closed).
• Needs research on most elegant and best practice approach to query the same resource via ID and slug
• We will discuss options here

changed the description

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added Blocked label and removed To Do label

removed Blocked label

mentioned in issue #97 (moved)

marked this issue as related to #97 (moved)

added To Do label

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changed milestone to %1.0-alpha1 — Dockland Duckling