Edited canteen views to have direct database access in the CanteenPageFragment.kt, allowing for filtering the individual days through the database; filtering now works (with changes animated!!) through updating a LiveData and observing it in the page fragment

app/src/main/java/com/denizk0461/studip/viewmodel/CanteenPageViewModel.kt

@@ -0,0 +1,33 @@
+package com.denizk0461.studip.viewmodel
+
+import android.app.Application
+import androidx.lifecycle.LiveData
+import com.denizk0461.studip.model.CanteenOffer
+import com.denizk0461.studip.model.DietaryPreferences
+import com.denizk0461.studip.model.SettingsPreferences
+
+class CanteenPageViewModel(app: Application) : AppViewModel(app) {
+
+    /**
+     * Retrieves all canteen offers that match given day.
+     *
+     * @return all canteen offers matching the given day exposed through a LiveData object
+     */
+    fun getOffersByDay(day: Int): LiveData<List<CanteenOffer>> =
+        repo.getOffersByDay(day)
+
+    val dietaryPreferencesUpdate: LiveData<Int> = repo.dietaryPreferencesUpdate
+
+    /**
+     * Retrieve the user's dietary preferences.
+     *
+     * @return dietary preferences
+     */
+    fun getDietaryPrefs(): DietaryPreferences.Object = repo.getDietaryPrefsAsObject()
+
+    /**
+     * This value determines whether the user wants to have allergens marked.
+     */
+    val preferenceAllergen: Boolean
+        get() = repo.getBooleanPreference(SettingsPreferences.ALLERGEN, defaultValue = true)
+}

app/src/main/java/com/denizk0461/studip/viewmodel/CanteenViewModel.kt

@@ -22,12 +22,7 @@ class CanteenViewModel(app: Application) : AppViewModel(app) {
      */
     val allOffers: LiveData<List<CanteenOffer>> = repo.allOffers
 
-    /**
-     * Retrieve the user's dietary preferences.
-     *
-     * @return dietary preferences
-     */
-    fun getDietaryPrefs(): DietaryPreferences.Object = repo.getDietaryPrefsAsObject()
+
 
     /**
      * Retrieves all canteen offer date objects.
@@ -54,6 +49,17 @@ class CanteenViewModel(app: Application) : AppViewModel(app) {
         doAsync { parser.parse(canteen, onRefreshUpdate, onFinish) }
     }
 
+    fun registerDietaryPreferencesUpdate() {
+        repo.dietaryPreferencesUpdate.postValue(repo.dietaryPreferencesUpdate.value?.plus(1))
+    }
+
+    /**
+     * Retrieves the amount of dates represented in the offers stored locally. Can be observed.
+     *
+     * @return  date count as LiveData
+     */
+    fun getDateCount(): LiveData<Int> = repo.getDateCount()
+
     /**
      * Updates a given dietary preference to a new value.
      *