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Fix merging of _meta field #27352

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Merged
merged 3 commits into from
Nov 24, 2017
Merged

Fix merging of _meta field #27352

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3155057
Fix merging of _meta field
alexshadow007 Nov 11, 2017
c137946
Using local variable for merged meta
alexshadow007 Nov 16, 2017
76645cd
Remove meta empty case from Mapping::toXContent
alexshadow007 Nov 16, 2017
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2 changes: 1 addition & 1 deletion core/src/main/java/org/elasticsearch/index/mapper/DocumentMapper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -56,7 +56,7 @@ public static class Builder {

private final RootObjectMapper rootObjectMapper;

private Map<String, Object> meta = emptyMap();
private Map<String, Object> meta;
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I think this initialization should stay, for the case meta is not defined in the json?

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@rjernst I was thinking of using null for this case. Or is empty map better?
And which value must be used for unset meta?

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I'm fine with null. I had thought changing this from emtpy map to null would require updating Mapping.toXContent. However, it looks like it currently handles both cases. I would update that to remove the empty case (which means explicitly putting an empty _meta would be serialized, not disappear).


private final Mapper.BuilderContext builderContext;

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5 changes: 3 additions & 2 deletions core/src/main/java/org/elasticsearch/index/mapper/Mapping.java
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Original file line number Diff line number Diff line change
Expand Up @@ -98,7 +98,8 @@ public Mapping merge(Mapping mergeWith, boolean updateAllTypes) {
}
mergedMetaDataMappers.put(merged.getClass(), merged);
}
return new Mapping(indexCreated, mergedRoot, mergedMetaDataMappers.values().toArray(new MetadataFieldMapper[0]), mergeWith.meta);
Map<String, Object> mergedMeta = mergeWith.meta == null ? meta : mergeWith.meta;
return new Mapping(indexCreated, mergedRoot, mergedMetaDataMappers.values().toArray(new MetadataFieldMapper[0]), mergedMeta);
}

/**
Expand Down Expand Up @@ -128,7 +129,7 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
root.toXContent(builder, params, new ToXContent() {
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
if (meta != null && !meta.isEmpty()) {
if (meta != null) {
builder.field("_meta", meta);
}
for (Mapper mapper : metadataMappers) {
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43 changes: 43 additions & 0 deletions core/src/test/java/org/elasticsearch/index/mapper/DocumentMapperMergeTests.java
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Expand Up @@ -289,4 +289,47 @@ public void testMergeAddingParent() throws IOException {
Exception e = expectThrows(IllegalArgumentException.class, () -> initMapper.merge(updatedMapper.mapping(), false));
assertThat(e.getMessage(), containsString("The _parent field's type option can't be changed: [null]->[parent]"));
}

public void testMergeMeta() throws IOException {
DocumentMapperParser parser = createIndex("test").mapperService().documentMapperParser();

String initMapping = XContentFactory.jsonBuilder()
.startObject()
.startObject("test")
.startObject("_meta")
.field("foo").value("bar")
.endObject()
.endObject()
.endObject()
.string();
DocumentMapper initMapper = parser.parse("test", new CompressedXContent(initMapping));

assertThat(initMapper.meta().get("foo"), equalTo("bar"));

String updateMapping = XContentFactory.jsonBuilder()
.startObject()
.startObject("test")
.startObject("properties")
.startObject("name").field("type", "text").endObject()
.endObject()
.endObject()
.endObject()
.string();
DocumentMapper updatedMapper = parser.parse("test", new CompressedXContent(updateMapping));

assertThat(initMapper.merge(updatedMapper.mapping(), true).meta().get("foo"), equalTo("bar"));

updateMapping = XContentFactory.jsonBuilder()
.startObject()
.startObject("test")
.startObject("_meta")
.field("foo").value("new_bar")
.endObject()
.endObject()
.endObject()
.string();
updatedMapper = parser.parse("test", new CompressedXContent(updateMapping));

assertThat(initMapper.merge(updatedMapper.mapping(), true).meta().get("foo"), equalTo("new_bar"));
}
}