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Contents
---
title: DSL Merge Behavior
---
Generally, the merge should behave as expected. For example, map or Hash fields are merged together from multiple layers. Strings are simply replaced.
## Hash Example
.kubes/resources/base/all.rb
```ruby
labels(app: "demo")
# ...
```
.kubes/resources/base/all/env.rb
```ruby
labels(env: Kubes.env)
# ...
```
.kubes/resources/web/deployment.rb
```ruby
labels(role: "web")
# ...
```
Layering results in:
.kubes/output/web/deployment.yaml
```yaml
metadata:
labels:
app: demo
env: dev
role: web
# ...
```
## Hash Merge Behavior Override
You can override the merge behavior with the `_mode` key.
.kubes/resources/web/deployment.rb
```ruby
labels(role: "web", _mode: "reset")
# ...
```
This will completely reset the labels and result in:
```yaml
metadata:
labels:
role: web
# ...
```
## String Example
The merging of simple String is a straightforward replacement.
.kubes/resources/web/deployment.rb
```ruby
image built_image # IE: user/demo:kubes-2020-06-13T19-55-16-43afc6e
# ...
```
.kubes/resources/web/deployment/prod.rb
```ruby
image "nginx:prod-v1"
# ...
```
Results in:
.kubes/output/web/deployment.yaml
```yaml
spec:
# ...
template:
spec:
containers:
- image: nginx:prod-v1
name: demo-web
# ...
```
{% include dsl/methods.md name="backend_config" %}
Version data entries
21 entries across 21 versions & 1 rubygems