feat: adding Reading.cs model and Get, GetById and Post method

AirAware/Controllers/ReadingController.cs

@@ -0,0 +1,77 @@
+using AirAware.Data;
+using AirAware.Models;
+using AirAware.ViewModels;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace AirAware.Controllers;
+
+[ApiController]
+[Route("api/v1")]
+public class ReadingController: ControllerBase
+{
+    [HttpGet]
+    [Route("readings")]
+    public async Task<IActionResult> GetAsync([FromServices] AppDbContext context)
+    {
+        var readings = await context
+            .Readings
+            .AsNoTracking()
+            .ToListAsync();
+        return Ok(readings);
+    }
+
+    [HttpGet]
+    [Route("readings/{id}")]
+    public async Task<IActionResult> GetByIdAsync(
+        [FromServices] AppDbContext context, 
+        [FromRoute] Guid id
+    )
+    {
+        var reading = await context
+            .Readings
+            .AsNoTracking()
+            .FirstOrDefaultAsync(r => r.Id == id);
+
+        return reading == null 
+            ? NotFound() 
+            : Ok(reading);
+    }
+
+    [HttpPost("readings")]
+    public async Task<IActionResult> PostAsync(
+        [FromServices] AppDbContext context,
+        [FromBody] CreateReadingViewModel model
+    )
+    {
+        if (!ModelState.IsValid) 
+            return BadRequest("Invalid data provided.");
+
+        var station = await context
+            .Stations
+            .AsNoTracking()
+            .FirstOrDefaultAsync(s => s.Id == model.StationId);
+
+        if (station == null) 
+            return BadRequest("Station with the provided ID does not exist.");
+
+        var reading = new Reading
+        {
+            StationId = model.StationId,
+            Pm2_5 = model.Pm2_5,
+            Pm10 = model.Pm10,
+            RawPayload = model.RawPayload
+        };
+
+        try
+        {
+            await context.Readings.AddAsync(reading);
+            await context.SaveChangesAsync();
+            return Created($"api/v1/readings/{reading.Id}", reading);
+        }
+        catch (Exception)
+        {
+            return StatusCode(StatusCodes.Status500InternalServerError);
+        }
+    }
+}

AirAware/Controllers/StationController.cs

@@ -60,7 +60,7 @@ [FromBody] CreateStationViewModel model
         {
             await context.Stations.AddAsync(station);
             await context.SaveChangesAsync();
-            return Created($"v1/stations/{station.Id}", station);
+            return Created($"api/v1/stations/{station.Id}", station);
         }
         catch (Exception)
         {

AirAware/Data/AppDbContext.cs

@@ -6,6 +6,7 @@ namespace AirAware.Data;
 public class AppDbContext: DbContext
 {
     public DbSet<Station> Stations { get; set; }
+    public DbSet<Reading> Readings { get; set; }
 
     protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) => 
         optionsBuilder.UseSqlite("DataSource=app.db;Cache=Shared");

AirAware/Models/Reading.cs

@@ -0,0 +1,15 @@
+using System.Text.Json.Serialization;
+
+namespace AirAware.Models;
+
+public class Reading
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid StationId { get; set; }
+    [JsonIgnore]
+    public Station Station { get; set; } = null!;
+    public double Pm2_5 { get; set; }
+    public double Pm10 { get; set; }
+    public string? RawPayload { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.Now;
+}

AirAware/ViewModels/CreateReadingViewModel.cs

@@ -0,0 +1,14 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace AirAware.ViewModels;
+
+public class CreateReadingViewModel
+{
+    [Required]
+    public Guid StationId { get; set; }
+    [Required]
+    public double Pm2_5 { get; set; }
+    [Required]
+    public double Pm10 { get; set; }
+    public string? RawPayload { get; set; }
+}