Elements of Android Room Version 0.5 by Mark L. Murphy

Author:Mark L. Murphy
Language: eng
Format: mobi, epub
Publisher: CommonsWare
Published: 2021-03-14T20:34:41+00:00

@Transaction fun insert(notes: List<Note>) { insert(notes.filterIsInstance(CommentEntity::class.java)) insert(notes.filterIsInstance(LinkEntity::class.java)) }

Having the Note functions on PolyStore allows us to work with the concrete types or the Note interface, as we see fit:

package com.commonsware.room.misc.poly import androidx.room.Room import androidx.test.ext.junit.runners.AndroidJUnit4 import androidx.test.platform.app.InstrumentationRegistry import com.commonsware.room.misc.MiscDatabase import com.natpryce.hamkrest.* import com.natpryce.hamkrest.assertion.assertThat import org.junit.Test import org.junit.runner.RunWith @RunWith(AndroidJUnit4::class) class PolyStoreTest { private val db = Room.inMemoryDatabaseBuilder( InstrumentationRegistry.getInstrumentation().targetContext, MiscDatabase::class.java ) .build() private val underTest = db.polyStore() @Test fun comments() { assertThat(underTest.allComments(), isEmpty) val firstComment = CommentEntity(1, "This is a comment") val secondComment = CommentEntity(2, "This is another comment") underTest.insert(firstComment, secondComment) assertThat( underTest.allComments(), allOf( hasSize(equalTo(2)), hasElement(firstComment), hasElement(secondComment) ) ) assertThat( underTest.allNotes(), allOf( hasSize(equalTo(2)), hasElement(firstComment as Note), hasElement(secondComment as Note) ) ) } @Test fun links() { assertThat(underTest.allLinks(), isEmpty) val firstLink = LinkEntity(1, "CommonsWare", "https://commonsware.com") val secondLink = LinkEntity( 2, "Room Release Notes", "https://developer.android.com/jetpack/androidx/releases/room" ) underTest.insert(firstLink, secondLink) assertThat( underTest.allLinks(), allOf( hasSize(equalTo(2)), hasElement(firstLink), hasElement(secondLink) ) ) assertThat( underTest.allNotes(), allOf( hasSize(equalTo(2)), hasElement(firstLink as Note), hasElement(secondLink as Note) ) ) } @Test fun notes() { assertThat(underTest.allNotes(), isEmpty) val firstComment = CommentEntity(1, "This is a comment") val secondComment = CommentEntity(2, "This is another comment") val firstLink = LinkEntity(1, "CommonsWare", "https://commonsware.com") val secondLink = LinkEntity( 2, "Room Release Notes", "https://developer.android.com/jetpack/androidx/releases/room" ) underTest.insert(firstComment, secondComment, firstLink, secondLink) assertThat( underTest.allNotes(), allOf( hasSize(equalTo(4)), hasElement(firstLink as Note), hasElement(secondLink as Note), hasElement(firstComment as Note), hasElement(secondComment as Note) ) ) } }

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