Set seeded DB name by BE version

* Set seeded DB name by BE version

* Update readme depending on env variable

* Run init script at startup when db changed

README.md

@@ -24,14 +24,15 @@ Note: older versions might not contain certain functionality (e.g. archival mock
 ## Default setup
 
 By running `docker-compose up -d` these steps take place:
-1. a [mongodb](./services/mongodb/) container is created with some intial data.
+1. a [mongodb**](./services/mongodb/) container is created with some intial data.
 2. the SciCat [backend v3*](./services/backend/) container is created and connected to (1).
 3. the SciCat [backend v4](./services/backendnext/) container is created and connected to (1).
 4. the SciCat [frontend](./services/frontend/) container is created and connected to (3).
 5. the SciCat [PaN searchapi](./services/searchapi/) container is created and connected to (3).
 6. a reverse [proxy](./services/proxy) container is created and routes trafic to (2), (3), (4) and (5) through localhost subdomains, in the form: `http://${service}.localhost` (for the ones of need). The frontend is available at simply `http://localhost`.
 
-We flag with `*` the services which have extra internal dependencies, which are not shared across the two backend versions. To view them, refer to the service README.
+We flag with `*` the services which have extra internal dependencies, which are not shared across the two backend versions, and with `**` the ones which have a dependency on the `BE_VERSION` value. To view them, refer to the service README.
+
 
 Here below we show the dependencies (if `B` depends on `A`, then we visualize as `A --> B`):
 
@@ -43,7 +44,7 @@ graph TD
          backendnext
       end
 
-      mongodb --> backends
+      mongodb[mongodb**] --> backends
       backend --> frontend
       backend --> searchapi
    end
@@ -53,6 +54,10 @@ graph TD
    proxy -.- searchapi
 ```
 
+## Select the BE version to use
+
+The user can select what backend (either `backend` or `backendnext`) version to use, by setting the BE_VERSION environment variable, [either](https://docs.docker.com/compose/environment-variables/envvars-precedence/) setting it in the shell or changing the [.env](./.env#L1) file. If this variable is blank, the system will default to `backendnext`. The services with `**` have a dependency on the `BE_VERSION` value.
+
 ## Select the services
 
 The user can selectively decide the containers to spin up and the dependencies will be resolved accordingly. The available services are in the [services](./services/) folder and called consistently.

services/mongodb/README.md

@@ -12,6 +12,12 @@ To add more collections during the creation of the database:
 
 These files are ingested into the database using mongo funcionalities and bypassing the backend, i.e. they are not to be taken as examples to use the backend API.
 
-## Defaul configuration
+## Default configuration
 
-In the default configuration [init.js](./config/init.js), the seeding creates data in the [dacat](./config/init.js#L1) mongodb database used by the [backend container](../backend/).
+In the default configuration [init.js](./config/init.js), the seeding creates data in the [dacat](./config/init.js#L1) mongodb database used by the [backend container](../backend/) 
+
+## Dependency on `BE_VERSION`
+
+The seeded database is controlled by the [BE_VERSION environment](./docker-compose.yaml#L9) variable set at startup. This will control what DB is seeded, either the [dacat](./config/init.js#L1) mongodb database used by the [backend container](../backend/)  or the [dacat-next](./config/init.js#L1) mongodb database used by the [backendnext container](../backendnext/).  
+
+For an explanation of how setting `BE_VERSION` changes the environment creation see [here](./README.md#dependency-on-be_version).

services/mongodb/config/init.js

@@ -1,4 +1,4 @@
-db = connect('mongodb://localhost/dacat');
+db = connect(`mongodb://localhost/${process.env.BE_VERSION === 'backendnext'? 'dacat-next': 'dacat'}`);
 seedFiles = fs.readdirSync('/seed');
 seedFiles.forEach((filename) => {
   collectionName = filename.replace(/\.json$/, '');

services/mongodb/docker-compose.yaml

@@ -2,10 +2,14 @@ services:
   mongodb:
     image: mongo:7.0
     volumes:
-      - mongodb_data:/data/db
+      - ${BE_VERSION:-backendnext}_mongodb_data:/data/db
       - ./config/init.js:/docker-entrypoint-initdb.d/init.js
       - ./config/seed:/seed
+    environment:
+      BE_VERSION: ${BE_VERSION:-backendnext}
 
 volumes:
-  mongodb_data:
+  backendnext_mongodb_data:
+    driver: local
+  backend_mongodb_data:
     driver: local