what:
- add util to transform get response to an update request
RESOLVES CORE-1687
Given an update data object, we can infer the `fields` and `selects` of a data object using a util we already have - `getSelectsAndRelationsFromObjectArray`. Using the `fields` and `selects`, we can call either the module `retrieve` or `list` method to get a snapshot of the data down to its exact attributes. We can pass this data into the revert step.
In the revert step, we just need to convert the snapshot received from `retrieve` or `list` to a shape that the `update` methods will accept. The util that is introduced in this PR aims to do exactly that, so that the revert step looks as simple as:
```
const { snapshotData, selects, relations } = revertInput
await promotionModule.updateCampaigns(
convertItemResponseToUpdateRequest(snapshotData, selects, relations)
)
```
entity before update:
```
Campaign: {
id: "campaign-test-1",
name: "test campaign",
budget: {
total: 2000
},
promotions: [{ id: "promotion-1" }],
rules: [
{ id: "rule-1", operator: "gt", value: "10" }
]
}
```
This is how the util will transform the data for different types of attributes in the object:
simple attributes:
```
invoke:
{
id: "campaign-test-1",
name: "change name",
}
compensate:
{
id: "test-1",
name: "test campaign"
}
```
one to one relationship:
```
invoke:
{
id: "campaign-test-1",
budget: { total: 4000 }
}
compensate:
{
id: "campaign-test-1",
budget: { total: 2000 }
}
```
one to many / many to many relationship:
```
invoke:
{
id: "campaign-test-1",
promotions: [{ id: "promotion-2" }]
rules: [
{ id: "rule-1", operator: "gt", value: "20" },
{ operator: "gt", value: "20" }
]
}
compensate:
{
id: "campaign-test-1",
promotions: [{ id: "promotion-1" }]
rules: [{ id: "rule-1", operator: "gt", value: "20" }]
}
```
all together:
```
invoke:
{
id: "campaign-test-1",
name: "change name",
promotions: [{ id: "promotion-2" }],
budget: { total: 4000 },
rules: [
{ id: "rule-1", operator: "gt", value: "20" },
{ operator: "gt", value: "20" }
]
}
compensate:
{
id: "test-1",
name: "test campaign",
promotions: [{ id: "promotion-1" }],
budget: { total: 2000 },
rules: [{ id: "rule-1", operator: "gt", value: "20" }],
}
```
