Dynamics 365 OData getting 1:N linked entities - dynamics-crm

I have entities of type account which when I look at it in Dyn365 it has a section containing a list view of related entities. How do i get these related entities from the OData API?
I can query api/data/v9.1/account but the related entities do not appear anywhere in the resulting json.
If I do the same for the related entities the account do not appear anywhere. How do I get the link between these two types of entities? using the OData API.
I've tried things like /accounts?$expand=contact($select=foo) but it just says contact property do not exist on the account entity, which is correct. But contact is not a property its an entity type.

Solution is to use the following url to get the names of all relationships.
https://<company>.crm.dynamics.com/api/data/v9.1/RelationshipDefinitions?$select=SchemaName
Result is an array of the following rows for each relationship.
{"#odata.type":"#Microsoft.Dynamics.CRM.OneToManyRelationshipMetadata","SchemaName":"aaa_bbb","MetadataId":"<guid>"},
Then use those names, specifically the SchemaName property in the $expand query parameter.
https://crmdev.crm.dynamics.com/api/data/v9.1/accounts?
$select=<whatever>&
$expand=aaa_bbb($select=<properties from linked entity>)
To figure out what relationship actually do what you need, you need to read in more then just the SchemaName if you can't guess what is what, or look it up in Dynamics through the GUI if you know how and have access. I don't.
The RelationshipDefinition contains other properties like ReferencedEntity ReferencingEntity that can be used to determine if you got the right relationship.

Probably, this is what you are looking for. The relationship for 1:N between account and contact is contact_customer_accounts
All accounts with its related contacts:
https://crmdev.crm.dynamics.com/api/data/v9.1/accounts?$select=name&$expand=contact_customer_accounts($select=fullname)
Particular account with related contacts:
https://crmdev.crm.dynamics.com/api/data/v9.1/accounts(73C84814-729B-EA11-A811-000D3A370DB6)?$select=name&$expand=contact_customer_accounts($select=fullname)

Related

How to distinguish entities in Dynamics CRM using the web API?

I am using the request to GET "/api/data/v9.0/EntityDefinitions" to list all the entities that are present in Dynamics and get basic information regarding them (EntityMetadata EntityType).
I know that some of the entities are standard, custom, non-createable, non-updateable, etc.
To check if an entity is a custom I can use a field named IsCustom from EntityDefinition and if it is true then the entity is custom. But for non-createable entities and others (I don't know how to call them properly) this approach is not applicable, because there is no such field.
For example, 'activitypointer' supports only GET operation (activitypointer EntityType). Records of this type cannot be created. But from the request above, I cannot get the correct information about that.
Can entities be distinguished?
P.S.: maybe I did something wrong and need to look elsewhere?

How to use Get Record to lookup a related record on another object when I don't have the schema Entity Name - Just the LogicalName

All,
I am building a Power Flow. I am returning an object that has a relationship to another entity.
I want to get some values from the related entity.
I am attemping to use the "Get Record" connector. The returning object returns just the logicalEntityName (in this case "opportunities") but Get Record wants an Entity Name that is the Schema Name ("Working Opportunities").
Big Question: What's the secret to use CDS to get information from a related record in another object?
Little Question: How do I do get the Schema Name?
The logical name will be the same as schema name except some casing difference, ie schema name will have camel casing (first letter of first/second word with capitals, you can notice it clearly in custom entity which will have publisher prefix like new_entityname) and logical name will have pascal casing (all lower case).
You can find the details in XrmToolBox metadata browser or in Solution.
In the below snip, (Logical) Name = Opportunity and Schema Name = Opportunity, also Display Name can be anything and can be changed anytime.
Regarding the related entities, you should use List Records: GetItems_V2 and you can use filter by passing parent record to get related child records. Read more
Could you please share flow screenshot and response to help you with your requirement?
As suggested by Arun you could use List Record and filter query to pass parent record id which will be available from dynamic content.
see below link.
https://crmkeeper.com/2019/08/31/cds-list-records-filter-query-using-flow/
Please mark my answer verified if i were helpful

Dynamic parameters for views in Dynamics 365

I have a Account Relationship entity with two lookup fields called Recipient Account and Guide Account. I would like to be able to go on an Account and see all records where the Account Relationship's Recipient Account and Guide Account are set to the account I'm viewing.
In CRM, I can definitely create a view to fetch all account relationships on the Account Relationship entity and then inside the Account entity's form I can include the view with the data source set to Related Records Only and the entity set to Account Relationship (Recipient Account). But I can't do both in a single view.
Through what mechanism can I have it all be in one view? One thing I was considering was creating separate grids, one for Recipient Account and another for Guide Account. But I want to know if there is a mechanism where I can combine all records that have "Recipient Account = Current Account or Guide Account = Current Account" that is basically the query I want to run.
You could use connections. It's pretty flexible and will fulfill your needs as long they stay simple. That's the only viable option I see aside from using two views.
Keep only one subgrid of Account Relationship N:N intersect entity (either Guide account or Recipient account relation)
Register RetrieveMultiple pre-operation plugin to intercept the query & pass the custom fetchxml query by incorporating or filter
Fetchxml has to be built something like explained
Try this unrecommended if you wish but two grids are better choice. This alternate solution also you can try.

CRM 2016 - How to create a parent-child relationship with multiple parent types?

I have an entity - EntityZ, which has a ParentId where ParentId could be EntityA.Id, EntityB.Id or EntityC.Id. Is it possible to create this in MS Dynamics CRM 2016? If yes, how? I've looked but couldn't find a similar question or any help on the web.
An entity can be the child party in only one full parental relationship. When you are looking for a way to cascade record ownership, deletion a.o. between mutiple parent - child entities you can create configurable cascading relationships.
As Arun Vinoth pointed out you can design your entity as an activity type. However, this may conflict with the semantics of activity records in CRM. Also, doing this would make it possible to associate the child entity to any entity that is enabled for activities.
There’s a trade off to achieve this. Custom entity as Custom Activity
Creating custom entity EntityZ as custom activity and EntityA, B, C can act as parent.
EntityA or B or C can be chosen as RegardingObjectId of EntityZ.
This has security limitation like EntityZ will be visible to everyone as this will be listed like other activities (Email, Phonecall, Task, etc)
I think it is worth nothing that Dynamics 365 does contain and out-of-box "polymorphic" customer field.
This field can link to either an Account or Contact:
And while it can be kludgy, another option would be to create 3 lookups and only populate one. Once one is populated you could hide the other two. Or, you could have a "Parent Type" option set to determine which lookup to show.
It would be a bit messy to show three lookups in a view, with only one populated, so you might also want a Parent Name text field in to which you could concatenate the type and name. You could use a workflow to populate it, and then use it in views and reports.

Linq To SQL : Modeling Associations

I have three tables Projects, Users and ProjectMembers. The ProjectMembers table is a mapping table and has only two columns ProjectId and UserId.
In my object model i have two classes Project and User. The Project class has a property IEnumerable<User> Members
I am using an external xml map file for mapping linq to sql associations. I am able to get the Project and the User data but I dont know how to map the Members association.
This sounds like a Many-to-Many mapping (Projects <-> Users).
In which case you are going to run into problems using Linq To SQL. To cut a long story short it does not really support that mapping. There are several workarounds which you can find on google, one of which is altering the partial class to provide the access to the Members/Projects collection on the Project and User classes respectively.
e.g. http://www.iaingalloway.com/2015/06/many-to-many-relationships-in-linq-to-sql.html

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