Beginings of api rework with channel inclusion

YTManager/Controllers/Channels.cs

@@ -1,4 +1,5 @@
-using System.Linq;
+using System.Collections.Generic;
+using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
@@ -7,19 +8,50 @@ namespace YTManager.Controllers {
     [Produces("application/json")]
     [Route("api/Channels")]
     public class ChannelsController : Controller {
+        // Custom return type for API accesses. Done this way to ensure we
+        // always return the expected data regardless of the underlying model.
+        struct Channel_ForAPI {
+            public string Title;
+            public string Description;
+            public string YTID;
+            public List<string> Video_IDs;
+
+            public Channel_ForAPI(Models.Channel c) {
+                Title = c.Title;
+                Description = c.Description;
+                YTID = c.YoutubeID;
+                Video_IDs = c.Videos?.Select(v => v.YoutubeID).ToList();
+            }
+        }
+
         // DB context used for all these calls.
         private readonly MediaDB db;
 
+        // Maximum number of channels to return per query.
+        private readonly int max_per_query = 20;
+
         // Constructor to fetch the db context.
         public ChannelsController(MediaDB context) => db = context;
 
-        // GET api/Channels
+        // Returns the most recently added channels.
         [HttpGet]
         public async Task<IActionResult> Get() {
-            return Ok(await db.Channels.OrderByDescending(c => c.AddedtoDB).ToListAsync());
+            // Get all the relevant channels.
+            var chanels = await db.Channels
+                .OrderByDescending(i => i.AddedtoDB)
+                .Take(max_per_query)
+                .ToListAsync();
+
+            // Convert them to what we will send out.
+            var converted = chanels
+                .Select(ch => new Channel_ForAPI(ch))
+                .ToList();
+
+            // Convert all the videos to what we will send back.
+            return Ok(converted);
         }
 
-        // GET api/Channels/5
+        // GET api/Channels/sdfs6DFS65f
         [HttpGet("{YTchannelID}")]
         public async Task<IActionResult> Get([FromQuery] string YTchannelID) {
             var channel = await db.Channels.SingleOrDefaultAsync(c => c.YoutubeID == YTchannelID);