Merge multiple hashes after new key - ruby

Question

I've got three hashes which I want to merge to base_options under new key - checks. Basically what I want to achieve is:
{
base_options,
checks: {
document_check,
identity_check,
dummy_check,
}
},
Below sample hash data:
dummy_check = {
dummy: {
enabled: true,
preferences: {
state: 0,
replay: true,
},
}
}
identity_check = {
identity: {
enabled: true,
preferences: {},
},
}
document_check = {
document: {
enabled: true,
preferences: {
face: false,
liveness: false,
docs_all: true,
},
},
}
base_options = {
send_email: true,
send_reminder: false,
reset_client_status: true,
}
So if I do base_options.merge!(checks: document_check.merge!(identity_check, dummy_check)) I will receive expected hash which is:
{
send_email: true,
send_reminder: false,
reset_client_status: true,
checks: {
document: {
...
},
identity: {
...
},
dummy: {
...
}
},
}
But this is not super flexible and I don't know if using .merge! two times in one line is not a crap. Are there any other alternatives?
I'm using Ruby 2.7 and Rails 6

Answer 1

Using merge! is fine and well understood. However, as you are setting a single key on your base_options hash, you can also simple use the hash accessor, i.e.
base_options[:checks] = document_check.merge!(identity_check, dummy_check)
Note that this will also change the document_hash object as merge! modified the receiver. If this is not desired, you can also use merge and return a new Hash. Thus could look like:
base_options[:checks] = document_check.merge(identity_check, dummy_check)
or equivalently
base_options[:checks] = {}.merge!(document_check, identity_check, dummy_check)
The latter option is slightly slower but might better show your intended behavior and is thus easier to understand to readers of your code.

Answer 2

If I understand correctly, you can try the Double Splat **. you can use like this:
base_options.merge(
checks: **document_check, **identity_check, **dummy_check
)

Answer 3

The answer is in your question, below can be a simple way of achieving the end result.
Below is after initializing values of base_options, document_check, identity_check,dummy check.
base_options = {
base_options: base_options,
checks: {
document_check: document_check,
identity_check: identity_check,
dummy_check: dummy_check,
}
}
=> {:base_options=>{:send_email=>true, :send_reminder=>false, :reset_client_status=>true}, :checks=>{:document_check=>{:document=>{:enabled=>true, :preferences=>{:face=>false, :liveness=>false, :docs_all=>true}}}, :identity_check=>{:identity=>{:enabled=>true, :preferences=>{}}}, :dummy_check=>{:dummy=>{:enabled=>true, :preferences=>{:state=>0, :replay=>true}}}}}